diff --git a/compiler/cpp/Makefile.am b/compiler/cpp/Makefile.am
index 4766aa2..ae69de9 100644
--- a/compiler/cpp/Makefile.am
+++ b/compiler/cpp/Makefile.am
@@ -18,7 +18,8 @@
                  src/generate/t_perl_generator.cc \
                  src/generate/t_ocaml_generator.cc \
                  src/generate/t_erl_generator.cc \
-                 src/generate/t_hs_generator.cc 
+                 src/generate/t_hs_generator.cc \
+                 src/generate/t_cocoa_generator.cc 
 
 thrift_CXXFLAGS = -Wall -Isrc $(BOOST_CPPFLAGS)
 thrift_LDFLAGS = -Wall $(BOOST_LDFLAGS)
diff --git a/compiler/cpp/src/generate/t_cocoa_generator.cc b/compiler/cpp/src/generate/t_cocoa_generator.cc
new file mode 100644
index 0000000..14e0e61
--- /dev/null
+++ b/compiler/cpp/src/generate/t_cocoa_generator.cc
@@ -0,0 +1,1839 @@
+// Copyright (c) 2006- Facebook
+// Distributed under the Thrift Software License
+//
+// See accompanying file LICENSE or visit the Thrift site at:
+// http://developers.facebook.com/thrift/
+
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <sstream>
+#include "t_cocoa_generator.h"
+using namespace std;
+
+/**
+ * Prepares for file generation by opening up the necessary file output
+ * streams.
+ */
+void t_cocoa_generator::init_generator() {
+  // Make output directory
+  mkdir(T_COCOA_DIR, S_IREAD | S_IWRITE | S_IEXEC);
+  cocoa_prefix_ = program_->get_cocoa_prefix();
+
+  // we have a .h header file...
+  string f_header_name = program_name_+".h";
+  string f_header_fullname = string(T_COCOA_DIR)+"/"+f_header_name;
+  f_header_.open(f_header_fullname.c_str());
+
+  f_header_ << 
+    autogen_comment() <<
+    endl;
+
+  f_header_ <<
+    cocoa_imports() <<
+    cocoa_thrift_imports();
+
+  // ...and a .m implementation file
+  string f_impl_name = string(T_COCOA_DIR)+"/"+program_name_+".m";
+  f_impl_.open(f_impl_name.c_str());
+
+  f_impl_ << 
+    autogen_comment() <<
+    endl;
+
+  f_impl_ <<
+    cocoa_imports() <<
+    cocoa_thrift_imports() <<
+    "#import \"" << f_header_name << "\"" << endl <<
+    endl;
+  
+}
+
+/**
+ * Prints standard Cocoa imports
+ *
+ * @return List of imports for Cocoa libraries
+ */
+string t_cocoa_generator::cocoa_imports() {
+  return
+    string() +
+    "#import <Cocoa/Cocoa.h>\n" +
+    "\n";
+}
+
+/**
+ * Prints thrift runtime imports
+ *
+ * @return List of imports necessary for thrift runtime
+ */
+string t_cocoa_generator::cocoa_thrift_imports() {
+  return
+    string() +
+    "#import <TProtocol.h>\n" +
+    "#import <TApplicationException.h>\n" +
+    "#import <TProtocolUtil.h>\n" +
+    "\n";
+}
+
+/**
+ * Finish up generation.
+ */
+void t_cocoa_generator::close_generator() 
+{
+  // stick our constants declarations at the end of the header file
+  // since they refer to things we are defining.
+  f_header_ << constants_declarations_;
+}
+
+/**
+ * Generates a typedef. This is just a simple 1-liner in objective-c
+ *
+ * @param ttypedef The type definition
+ */
+void t_cocoa_generator::generate_typedef(t_typedef* ttypedef) {
+  f_header_ <<
+    indent() << "typedef " << type_name(ttypedef->get_type()) << " " << cocoa_prefix_ << ttypedef->get_symbolic() << ";" << endl <<
+    endl;
+}
+
+/**
+ * Generates code for an enumerated type. In Objective-C, this is
+ * essentially the same as the thrift definition itself, using the
+ * enum keyword in Objective-C.  For namespace purposes, the name of
+ * the enum plus an underscore is prefixed onto each element.
+ *
+ * @param tenum The enumeration
+ */
+void t_cocoa_generator::generate_enum(t_enum* tenum) {
+  f_header_ <<
+    indent() << "enum " << cocoa_prefix_ << tenum->get_name() << " {" << endl;
+  indent_up();
+
+  vector<t_enum_value*> constants = tenum->get_constants();
+  vector<t_enum_value*>::iterator c_iter;
+  bool first = true;
+  for (c_iter = constants.begin(); c_iter != constants.end(); ++c_iter) {
+    if (first) {
+      first = false;
+    } else {
+      f_header_ <<
+        "," << endl;
+    }
+    f_header_ <<
+      indent() << tenum->get_name() << "_" << (*c_iter)->get_name();
+    if ((*c_iter)->has_value()) {
+      f_header_ <<
+        " = " << (*c_iter)->get_value();
+    }
+  }
+
+  indent_down();
+  f_header_ <<
+    endl <<
+    "};" << endl <<
+    endl;
+}
+
+/**
+ * Generates a class that holds all the constants.  Primitive values
+ * could have been placed outside this class, but I just put
+ * everything in for consistency.
+ */
+void t_cocoa_generator::generate_consts(std::vector<t_const*> consts) {
+  std::ostringstream const_interface;
+  string constants_class_name = cocoa_prefix_ + program_name_ + "Constants";
+
+  const_interface << "@interface " << constants_class_name << " ";
+  scope_up(const_interface);
+  scope_down(const_interface);
+
+  // getter method for each constant defined.
+  vector<t_const*>::iterator c_iter;
+  for (c_iter = consts.begin(); c_iter != consts.end(); ++c_iter) {
+    string name = (*c_iter)->get_name();
+    t_type* type = (*c_iter)->get_type();
+    const_interface <<
+      "+ (" << type_name(type) << ") " << name << ";" << endl;
+  }
+
+  const_interface << "@end";
+
+  // this gets spit into the header file in ::close_generator
+  constants_declarations_ = const_interface.str();
+
+  // static variables in the .m hold all constant values
+  for (c_iter = consts.begin(); c_iter != consts.end(); ++c_iter) {
+    string name = (*c_iter)->get_name();
+    t_type* type = (*c_iter)->get_type();
+    f_impl_ <<
+      "static " << type_name(type) << " " << cocoa_prefix_ << name;
+    if (!type->is_container() && !type->is_struct()) {
+      f_impl_ << " = " << render_const_value(name, type, (*c_iter)->get_value());
+    }
+    f_impl_ << ";" << endl;
+  }
+  f_impl_ << endl;
+
+  f_impl_ << "@implementation " << constants_class_name << endl;
+
+  // initialize complex constants when the class is loaded
+  f_impl_ << "+ (void) initialize ";
+  scope_up(f_impl_);
+
+  for (c_iter = consts.begin(); c_iter != consts.end(); ++c_iter) {
+    if ((*c_iter)->get_type()->is_container() ||
+        (*c_iter)->get_type()->is_struct()) {
+      string name = (*c_iter)->get_name();
+      f_impl_ << indent() << name << " = " << render_const_value(name,
+                                                                 (*c_iter)->get_type(),
+                                                                 (*c_iter)->get_value());
+      f_impl_ << ";" << endl;
+    }
+  }
+  scope_down(f_impl_);
+
+  // getter method for each constant
+  for (c_iter = consts.begin(); c_iter != consts.end(); ++c_iter) {
+    string name = (*c_iter)->get_name();
+    t_type* type = (*c_iter)->get_type();
+    f_impl_ <<
+      "+ (" << type_name(type) << ") " << name;
+    scope_up(f_impl_);
+    indent(f_impl_) << "return " << name << ";" << endl;
+    scope_down(f_impl_);
+  }
+
+  f_impl_ << "@end" << endl << endl;
+}
+
+
+/**
+ * Generates a struct definition for a thrift data type. This is a class
+ * with protected data members, read(), write(), and getters and setters.
+ *
+ * @param tstruct The struct definition
+ */
+void t_cocoa_generator::generate_struct(t_struct* tstruct) {
+  generate_cocoa_struct_interface(f_header_, tstruct, false);
+  generate_cocoa_struct_implementation(f_impl_, tstruct, false);
+}
+
+/**
+ * Exceptions are structs, but they inherit from NSException
+ *
+ * @param tstruct The struct definition
+ */
+void t_cocoa_generator::generate_xception(t_struct* txception) {
+  generate_cocoa_struct_interface(f_header_, txception, true);
+  generate_cocoa_struct_implementation(f_impl_, txception, true);
+}
+
+
+/**
+ * Generate the interface for a struct
+ *
+ * @param tstruct The struct definition
+ */
+void t_cocoa_generator::generate_cocoa_struct_interface(ofstream &out,
+                                                      t_struct* tstruct,
+                                                      bool is_exception) {
+  out << "@interface " << cocoa_prefix_ << tstruct->get_name() << " : ";
+  
+  if (is_exception) {
+    out << "NSException ";
+  } else {
+    out << "NSObject ";
+  }    
+  
+  scope_up(out);
+
+  // members are protected.  this is redundant, but explicit.
+  //  f_header_ << endl << "@protected:" << endl;
+
+  const vector<t_field*>& members = tstruct->get_members();
+
+  // member varialbes
+  vector<t_field*>::const_iterator m_iter; 
+  for (m_iter = members.begin(); m_iter != members.end(); ++m_iter) {
+    out << indent() << declare_field(*m_iter) << endl;
+  }
+
+  if (members.size() > 0) {
+    out << endl;
+    // isset fields
+    for (m_iter = members.begin(); m_iter != members.end(); ++m_iter) {
+      indent(out) <<
+        "BOOL __" << (*m_iter)->get_name() << "_isset;" <<  endl;
+    }
+  }
+
+  scope_down(out);
+  out << endl;
+
+  // initializer for all fields
+  if (!members.empty()) {
+    generate_cocoa_struct_initializer_signature(out, tstruct);
+    out << ";" << endl;
+  }
+  out << endl;
+
+  // getters and setters
+  generate_cocoa_struct_field_accessor_declarations(out, tstruct, is_exception);
+
+  out << "@end" << endl << endl;
+}
+
+
+/**
+ * Generate signature for initializer of struct with a parameter for
+ * each field.
+ */
+void t_cocoa_generator::generate_cocoa_struct_initializer_signature(ofstream &out,
+                                                                  t_struct* tstruct) {
+  const vector<t_field*>& members = tstruct->get_members();
+  vector<t_field*>::const_iterator m_iter; 
+  indent(out) << "- (id) initWith";
+  for (m_iter = members.begin(); m_iter != members.end(); ) {
+    if (m_iter == members.begin()) {
+      out << capitalize((*m_iter)->get_name());
+    } else {
+      out << (*m_iter)->get_name();
+    }
+    out << ": (" << type_name((*m_iter)->get_type()) << ") " <<
+      (*m_iter)->get_name();
+    ++m_iter;
+    if (m_iter != members.end()) {
+      out << " ";
+    }
+  }
+}
+
+
+/**
+ * Generate getter and setter declarations for all fields, plus an
+ * IsSet getter.
+ */
+void t_cocoa_generator::generate_cocoa_struct_field_accessor_declarations(ofstream &out,
+                                                                          t_struct* tstruct,
+                                                                          bool is_exception) {
+  const vector<t_field*>& members = tstruct->get_members();
+  vector<t_field*>::const_iterator m_iter; 
+  for (m_iter = members.begin(); m_iter != members.end(); ++m_iter) {
+    out << indent() << "- (" << type_name((*m_iter)->get_type()) << ") " << decapitalize((*m_iter)->get_name()) << ";" << endl;
+    out << indent() << "- (void) set" << capitalize((*m_iter)->get_name()) << 
+      ": (" << type_name((*m_iter)->get_type()) << ") " << (*m_iter)->get_name() << ";" << endl;
+    out << indent() << "- (BOOL) " << (*m_iter)->get_name() << "IsSet;" << endl << endl;
+  }
+}
+
+
+/**
+ * Generate struct implementation.
+ *
+ * @param tstruct      The struct definition
+ * @param is_exception Is this an exception?
+ * @param is_result    If this is a result it needs a different writer
+ */
+void t_cocoa_generator::generate_cocoa_struct_implementation(ofstream &out,
+                                                             t_struct* tstruct,
+                                                             bool is_exception,
+                                                             bool is_result) {
+  indent(out) <<
+    "@implementation " << cocoa_prefix_ << tstruct->get_name() << endl;
+
+  // exceptions need to call the designated initializer on NSException
+  if (is_exception) {
+    out << indent() << "- (id) init" << endl;
+    scope_up(out);
+    out << indent() << "return [super initWithName: @\"" << tstruct->get_name() <<
+        "\" reason: @\"unknown\" userInfo: nil];" << endl;
+    scope_down(out);
+  }
+
+  // initializer with all fields as params
+  const vector<t_field*>& members = tstruct->get_members();
+  if (!members.empty()) {
+    generate_cocoa_struct_initializer_signature(out, tstruct);
+    out << endl;
+    scope_up(out);
+    if (is_exception) {
+      out << indent() << "self = [self init];" << endl;
+    } else {
+      out << indent() << "self = [super init];" << endl;
+    }
+
+    vector<t_field*>::const_iterator m_iter; 
+    for (m_iter = members.begin(); m_iter != members.end(); ++m_iter) {
+      t_type* t = get_true_type((*m_iter)->get_type());
+      out << indent() << "__" << (*m_iter)->get_name() << " = ";
+      if (type_can_be_null(t)) {
+        out << "[" << (*m_iter)->get_name() << " retain];" << endl;
+      } else {
+        out << (*m_iter)->get_name() << ";" << endl;
+      }
+      out << indent() << "__" << (*m_iter)->get_name() << "_isset = YES;" << endl;
+    }
+
+    out << indent() << "return self;" << endl;
+    scope_down(out);
+    out << endl;
+  }
+
+  // dealloc
+  if (!members.empty()) {
+    out << "- (void) dealloc" << endl;
+    scope_up(out);
+
+    vector<t_field*>::const_iterator m_iter; 
+    for (m_iter = members.begin(); m_iter != members.end(); ++m_iter) {
+      t_type* t = get_true_type((*m_iter)->get_type());
+      if (type_can_be_null(t)) {
+        indent(out) << "[__" << (*m_iter)->get_name() << " release];" << endl;
+      }
+    }
+
+    out << indent() << "[super dealloc];" << endl;
+    scope_down(out);
+    out << endl;
+  }
+
+  // the rest of the methods
+  generate_cocoa_struct_field_accessor_implementations(out, tstruct, is_exception);
+  generate_cocoa_struct_reader(out, tstruct);
+  if (is_result) {
+    generate_cocoa_struct_result_writer(out, tstruct);
+  } else {
+    generate_cocoa_struct_writer(out, tstruct);
+  }
+  generate_cocoa_struct_description(out, tstruct);
+
+  out << "@end" << endl << endl;
+}
+
+
+/**
+ * Generates a function to read all the fields of the struct.
+ *
+ * @param tstruct The struct definition
+ */
+void t_cocoa_generator::generate_cocoa_struct_reader(ofstream& out,
+                                                     t_struct* tstruct) {
+  out <<
+    "- (void) read: (id <TProtocol>) inProtocol" << endl;
+  scope_up(out);
+
+  const vector<t_field*>& fields = tstruct->get_members();
+  vector<t_field*>::const_iterator f_iter;
+
+  // Declare stack tmp variables
+  indent(out) << "NSString * fieldName;" << endl;
+  indent(out) << "int fieldType;" << endl;
+  indent(out) << "int fieldID;" << endl;
+  out << endl;
+
+  indent(out) << "[inProtocol readStructBeginWithName: NULL];" << endl;
+  
+  // Loop over reading in fields
+  indent(out) <<
+    "while (true)" << endl;
+    scope_up(out);
+    
+    // Read beginning field marker
+    indent(out) <<
+      "[inProtocol readFieldBeginWithName: &fieldName type: &fieldType fieldID: &fieldID];" << endl;
+    
+    // Check for field STOP marker and break
+    indent(out) <<
+      "if (fieldType == TType_STOP) { " << endl;
+    indent_up();
+    indent(out) <<
+      "break;" << endl;
+    indent_down();
+    indent(out) <<
+      "}" << endl;
+    
+    // Switch statement on the field we are reading
+    indent(out) <<
+      "switch (fieldID)" << endl;
+
+      scope_up(out);
+    
+      // Generate deserialization code for known cases
+      for (f_iter = fields.begin(); f_iter != fields.end(); ++f_iter) {
+        indent(out) <<
+          "case " << (*f_iter)->get_key() << ":" << endl;
+        indent_up();
+        indent(out) <<
+          "if (fieldType == " << type_to_enum((*f_iter)->get_type()) << ") {" << endl;
+        indent_up();
+
+        generate_deserialize_field(out, *f_iter, "fieldValue");
+        indent(out) << call_field_setter(*f_iter, "fieldValue") << endl;
+        // if this is an allocated field, release it since the struct
+        // is now retaining it
+        if (type_can_be_null((*f_iter)->get_type())) {
+          indent(out) << "[fieldValue release];" << endl;
+        }
+
+        indent_down();
+        out <<
+          indent() << "} else { " << endl <<
+          indent() << "  [TProtocolUtil skipType: fieldType onProtocol: inProtocol];" << endl <<
+          indent() << "}" << endl <<
+          indent() << "break;" << endl;
+        indent_down();
+      }
+      
+      // In the default case we skip the field
+      out <<
+        indent() << "default:" << endl <<
+        indent() << "  [TProtocolUtil skipType: fieldType onProtocol: inProtocol];" << endl <<
+        indent() << "  break;" << endl;
+      
+      scope_down(out);
+
+    // Read field end marker
+    indent(out) <<
+      "[inProtocol readFieldEnd];" << endl;
+    
+    scope_down(out);
+      
+    out <<
+      indent() << "[inProtocol readStructEnd];" << endl;
+
+  indent_down();
+  out <<
+    indent() << "}" << endl <<
+    endl;
+}
+
+/**
+ * Generates a function to write all the fields of the struct
+ *
+ * @param tstruct The struct definition
+ */
+void t_cocoa_generator::generate_cocoa_struct_writer(ofstream& out,
+                                                     t_struct* tstruct) {
+  out <<
+    indent() << "- (void) write: (id <TProtocol>) outProtocol {" << endl;
+  indent_up();
+
+  string name = tstruct->get_name();
+  const vector<t_field*>& fields = tstruct->get_members();
+  vector<t_field*>::const_iterator f_iter;
+
+  out <<
+    indent() << "[outProtocol writeStructBeginWithName: @\"" << name << "\"];" << endl;
+
+  for (f_iter = fields.begin(); f_iter != fields.end(); ++f_iter) {
+    bool null_allowed = type_can_be_null((*f_iter)->get_type());
+    if (null_allowed) {
+      out <<
+        indent() << "if (__" << (*f_iter)->get_name() << " != nil) {" << endl;
+      indent_up();
+    }
+
+    indent(out) << "[outProtocol writeFieldBeginWithName: @\"" << 
+      (*f_iter)->get_name() << "\" type: " << type_to_enum((*f_iter)->get_type()) << 
+      " fieldID: " << (*f_iter)->get_key() << "];" << endl;
+
+    // Write field contents
+    generate_serialize_field(out, *f_iter, "__"+(*f_iter)->get_name());
+
+    // Write field closer
+    indent(out) <<
+      "[outProtocol writeFieldEnd];" << endl;
+    
+    if (null_allowed) {
+      indent_down();
+      indent(out) << "}" << endl;
+    }
+  }
+  // Write the struct map
+  out <<
+    indent() << "[outProtocol writeFieldStop];" << endl <<
+    indent() << "[outProtocol writeStructEnd];" << endl;
+
+  indent_down();
+  out <<
+    indent() << "}" << endl <<
+    endl;
+}
+
+/**
+ * Generates a function to write all the fields of the struct, which
+ * is a function result. These fields are only written if they are
+ * set, and only one of them can be set at a time.
+ *
+ * @param tstruct The struct definition
+ */
+void t_cocoa_generator::generate_cocoa_struct_result_writer(ofstream& out,
+                                                            t_struct* tstruct) {
+  out <<
+    indent() << "- (void) write: (id <TProtocol>) outProtocol {" << endl;
+  indent_up();
+
+  string name = tstruct->get_name();
+  const vector<t_field*>& fields = tstruct->get_members();
+  vector<t_field*>::const_iterator f_iter;
+
+  out <<
+    indent() << "[outProtocol writeStructBeginWithName: @\"" << name << "\"];" << endl;
+
+  bool first = true;
+  for (f_iter = fields.begin(); f_iter != fields.end(); ++f_iter) {
+    if (first) {
+      first = false;
+      out <<
+        endl <<
+        indent() << "if ";
+    } else {
+      out <<
+        " else if ";
+    }
+
+    out <<
+      "(__" << (*f_iter)->get_name() << "_isset) {" << endl;
+    indent_up();
+
+    bool null_allowed = type_can_be_null((*f_iter)->get_type());
+    if (null_allowed) {
+      out <<
+        indent() << "if (__" << (*f_iter)->get_name() << " != nil) {" << endl;
+      indent_up();
+    }
+
+    indent(out) << "[outProtocol writeFieldBeginWithName: @\"" <<
+      (*f_iter)->get_name() << "\" type: " << type_to_enum((*f_iter)->get_type()) << 
+      " fieldID: " << (*f_iter)->get_key() << "];" << endl;
+
+    // Write field contents
+    generate_serialize_field(out, *f_iter, "__"+(*f_iter)->get_name());
+
+    // Write field closer
+    indent(out) <<
+      "[outProtocol writeFieldEnd];" << endl;
+
+    if (null_allowed) {
+      indent_down();
+      indent(out) << "}" << endl;
+    }
+
+    indent_down();
+    indent(out) << "}";
+  }
+  // Write the struct map
+  out <<
+    endl <<
+    indent() << "[outProtocol writeFieldStop];" << endl <<
+    indent() << "[outProtocol writeStructEnd];" << endl;
+
+  indent_down();
+  out <<
+    indent() << "}" << endl <<
+    endl;
+}
+
+/**
+ * Generate property accessor methods for all fields in the struct.
+ * getter, setter, isset getter.
+ *
+ * @param tstruct The struct definition
+ */
+void t_cocoa_generator::generate_cocoa_struct_field_accessor_implementations(ofstream& out,
+                                                                             t_struct* tstruct,
+                                                                             bool is_exception) {
+  const vector<t_field*>& fields = tstruct->get_members();
+  vector<t_field*>::const_iterator f_iter;
+  for (f_iter = fields.begin(); f_iter != fields.end(); ++f_iter) {
+    t_field* field = *f_iter;
+    t_type* type = get_true_type(field->get_type());
+    std::string field_name = field->get_name();
+    std::string cap_name = field_name;
+    cap_name[0] = toupper(cap_name[0]);
+
+    // Simple getter
+    indent(out) << "- (" << type_name(type) << ") ";
+    out << field_name << " {" << endl;
+    indent_up();
+    if (!type_can_be_null(type)) {
+      indent(out) << "return __" << field_name << ";" << endl;
+    } else {
+      indent(out) << "return [[__" << field_name << " retain] autorelease];" << endl;
+    }
+    indent_down();
+    indent(out) << "}" << endl << endl;
+
+    // Simple setter
+    indent(out) << "- (void) set" << cap_name << ": (" << type_name(type) <<
+      ") " << field_name << " {" << endl;
+    indent_up();
+    if (!type_can_be_null(type)) {
+      indent(out) << "__" << field_name << " = " << field_name << ";" << endl;
+    } else {
+      indent(out) << "[" << field_name << " retain];" << endl;
+      indent(out) << "[__" << field_name << " release];" << endl;
+      indent(out) << "__" << field_name << " = " << field_name << ";" << endl;
+    }
+    indent(out) << "__" << field_name << "_isset = YES;" << endl;
+    indent_down();
+    indent(out) << "}" << endl << endl;
+
+    // IsSet
+    indent(out) << "- (BOOL) " << field_name << "IsSet {" << endl;
+    indent_up();
+    indent(out) << "return __" << field_name << "_isset;" << endl;
+    indent_down();
+    indent(out) << "}" << endl << endl;
+    
+    // Unsetter - do we need this?
+    indent(out) << "- (void) unset" << cap_name << " {" << endl;
+    indent_up();
+    if (type_can_be_null(type)) {
+      indent(out) << "[__" << field_name << " release];" << endl;
+      indent(out) << "__" << field_name << " = nil;" << endl;
+    }
+    indent(out) << "__" << field_name << "_isset = NO;" << endl;
+    indent_down();
+    indent(out) << "}" << endl << endl;
+  }
+}
+
+/**
+ * Generates a description method for the given struct
+ *
+ * @param tstruct The struct definition
+ */
+void t_cocoa_generator::generate_cocoa_struct_description(ofstream& out,
+                                                          t_struct* tstruct) {
+  out <<
+    indent() << "- (NSString *) description {" << endl;
+  indent_up();
+
+  out <<
+    indent() << "NSMutableString * ms = [NSMutableString stringWithString: @\"" << 
+    tstruct->get_name() << "(\"];" << endl;
+
+  const vector<t_field*>& fields = tstruct->get_members();
+  vector<t_field*>::const_iterator f_iter;
+  bool first = true;
+  for (f_iter = fields.begin(); f_iter != fields.end(); ++f_iter) {
+    if (first) {
+      first = false;
+      indent(out) << "[ms appendString: @\"" << (*f_iter)->get_name() << ":\"];" << endl;
+    } else {
+      indent(out) << "[ms appendString: @\"," << (*f_iter)->get_name() << ":\"];" << endl;
+    }
+    t_type* ttype = (*f_iter)->get_type();
+    indent(out) << "[ms appendFormat: @\"" << format_string_for_type(ttype) << "\", __" <<
+      (*f_iter)->get_name() << "];" << endl;
+  }
+  out <<
+    indent() << "[ms appendString: @\")\"];" << endl <<
+    indent() << "return [ms copy];" << endl;
+
+  indent_down();
+  indent(out) << "}" << endl <<
+    endl;
+}
+
+
+/**
+ * Generates a thrift service.  In Objective-C this consists of a
+ * protocol definition, a client interface and a client implementation.
+ *
+ * @param tservice The service definition
+ */
+void t_cocoa_generator::generate_service(t_service* tservice) {
+  generate_cocoa_service_protocol(f_header_, tservice);
+  generate_cocoa_service_client_interface(f_header_, tservice);
+  generate_cocoa_service_helpers(tservice);
+  generate_cocoa_service_client_implementation(f_impl_, tservice);
+}
+
+
+/**
+ * Generates structs for all the service return types
+ *
+ * @param tservice The service
+ */
+void t_cocoa_generator::generate_cocoa_service_helpers(t_service* tservice) {
+  vector<t_function*> functions = tservice->get_functions();
+  vector<t_function*>::iterator f_iter; 
+  for (f_iter = functions.begin(); f_iter != functions.end(); ++f_iter) {
+    generate_function_helpers(*f_iter);
+  }
+}
+
+string t_cocoa_generator::function_result_helper_struct_type(t_function* tfunction) {
+  return capitalize(tfunction->get_name()) + "Result_";
+}
+
+
+/**
+ * Generates a struct and helpers for a function.
+ *
+ * @param tfunction The function
+ */
+void t_cocoa_generator::generate_function_helpers(t_function* tfunction) {
+  if (tfunction->is_async()) {
+    return;
+  }
+
+  // create a result struct with a success field of the return type,
+  // and a field for each type of exception thrown
+  t_struct result(program_, function_result_helper_struct_type(tfunction));
+  t_field success(tfunction->get_returntype(), "success", 0);
+  if (!tfunction->get_returntype()->is_void()) {
+    result.append(&success);
+  }
+
+  t_struct* xs = tfunction->get_xceptions();
+  const vector<t_field*>& fields = xs->get_members();
+  vector<t_field*>::const_iterator f_iter;
+  for (f_iter = fields.begin(); f_iter != fields.end(); ++f_iter) {
+    result.append(*f_iter);
+  }
+
+  // generate the result struct
+  generate_cocoa_struct_interface(f_impl_, &result, false);
+  generate_cocoa_struct_implementation(f_impl_, &result, false, true);
+}
+
+/**
+ * Generates a service protocol definition.
+ *
+ * @param tservice The service to generate a protocol definition for
+ */
+void t_cocoa_generator::generate_cocoa_service_protocol(ofstream& out,
+                                                        t_service* tservice) {
+  out << "@protocol " << cocoa_prefix_ << tservice->get_name() << " <NSObject>" << endl;
+
+  vector<t_function*> functions = tservice->get_functions();
+  vector<t_function*>::iterator f_iter; 
+  for (f_iter = functions.begin(); f_iter != functions.end(); ++f_iter) {
+    out << "- " << function_signature(*f_iter) << ";" << 
+      "  // throws ";
+    t_struct* xs = (*f_iter)->get_xceptions();
+    const std::vector<t_field*>& xceptions = xs->get_members();
+    vector<t_field*>::const_iterator x_iter;
+    for (x_iter = xceptions.begin(); x_iter != xceptions.end(); ++x_iter) {
+      out << type_name((*x_iter)->get_type()) + ", ";
+    }
+    out << "TException" << endl;
+  }
+  out << "@end" << endl << endl;
+}
+
+
+/**
+ * Generates a service client interface definition.
+ *
+ * @param tservice The service to generate a client interface definition for
+ */
+void t_cocoa_generator::generate_cocoa_service_client_interface(ofstream& out,
+                                                                t_service* tservice) {
+  out << "@interface " << cocoa_prefix_ << tservice->get_name() << "Client : NSObject <" << 
+    cocoa_prefix_ << tservice->get_name() << "> ";
+
+  scope_up(out);
+  out << indent() << "id <TProtocol> inProtocol;" << endl;
+  out << indent() << "id <TProtocol> outProtocol;" << endl;
+  scope_down(out);
+
+  out << "- (id) initWithProtocol: (id <TProtocol>) protocol;" << endl;
+  out << "- (id) initWithInProtocol: (id <TProtocol>) inProtocol outProtocol: (id <TProtocol>) outProtocol;" << endl;
+  out << "@end" << endl << endl;
+}
+
+
+/**
+ * Generates a service client implementation.
+ *
+ * @param tservice The service to generate an implementation for
+ */
+void t_cocoa_generator::generate_cocoa_service_client_implementation(ofstream& out,
+                                                                     t_service* tservice) {
+  out << "@implementation " << cocoa_prefix_ << tservice->get_name() << "Client" << endl;
+
+  // initializers
+  out << "- (id) initWithProtocol: (id <TProtocol>) protocol" << endl;
+  scope_up(out);
+  out << indent() << "return [self initWithInProtocol: protocol outProtocol: protocol];" << endl;
+  scope_down(out);
+  out << endl;
+
+  out << "- (id) initWithInProtocol: (id <TProtocol>) anInProtocol outProtocol: (id <TProtocol>) anOutProtocol" << endl;
+  scope_up(out);
+  out << indent() << "[super init];" << endl;
+  out << indent() << "inProtocol = [anInProtocol retain];" << endl;
+  out << indent() << "outProtocol = [anOutProtocol retain];" << endl;
+  out << indent() << "return self;" << endl;
+  scope_down(out);
+  out << endl;
+
+  // dealloc
+  out << "- (void) dealloc" << endl;
+  scope_up(out);
+  out << indent() << "[inProtocol release];" << endl;
+  out << indent() << "[outProtocol release];" << endl;
+  out << indent() << "[super dealloc];" << endl;
+  scope_down(out);
+  out << endl;
+
+  // generate client method implementations
+  vector<t_function*> functions = tservice->get_functions();
+  vector<t_function*>::const_iterator f_iter; 
+  for (f_iter = functions.begin(); f_iter != functions.end(); ++f_iter) {
+    string funname = (*f_iter)->get_name();
+
+    t_function send_function(g_type_void,
+                             string("send_") + (*f_iter)->get_name(),
+                             (*f_iter)->get_arglist());
+
+    string argsname = (*f_iter)->get_name() + "_args";
+
+    // Open function
+    indent(out) <<
+      "- " << function_signature(&send_function) << endl;
+    scope_up(out);
+
+    // Serialize the request
+    out <<
+      indent() << "[outProtocol writeMessageBeginWithName: @\"" << funname << "\"" <<
+      " type: TMessageType_CALL" <<
+      " sequenceID: 0];" << endl;
+    
+    out <<
+      indent() << "[outProtocol writeStructBeginWithName: @\"" << argsname << "\"];" << endl;
+
+    // write out function parameters
+    t_struct* arg_struct = (*f_iter)->get_arglist();
+    const vector<t_field*>& fields = arg_struct->get_members();
+    vector<t_field*>::const_iterator fld_iter;
+    for (fld_iter = fields.begin(); fld_iter != fields.end(); ++fld_iter) {
+      out <<
+        indent() << "[outProtocol writeFieldBeginWithName: @\"" << (*fld_iter)->get_name() << "\""
+        " type: " << type_to_enum((*fld_iter)->get_type()) <<
+        " fieldID: " << (*fld_iter)->get_key() << "];" << endl;
+
+      generate_serialize_field(out, *fld_iter, (*fld_iter)->get_name());
+
+      out <<
+        indent() << "[outProtocol writeFieldEnd];" << endl;
+    }
+
+    out <<
+      indent() << "[outProtocol writeFieldStop];" << endl;
+    out <<
+      indent() << "[outProtocol writeStructEnd];" << endl;
+
+    out <<
+      indent() << "[outProtocol writeMessageEnd];" << endl <<
+      indent() << "[[outProtocol transport] flush];" << endl;
+
+    scope_down(out);
+    out << endl;
+
+    if (!(*f_iter)->is_async()) {
+      t_struct noargs(program_);
+      t_function recv_function((*f_iter)->get_returntype(),
+                               string("recv_") + (*f_iter)->get_name(),
+                               &noargs,
+                               (*f_iter)->get_xceptions());
+      // Open function
+      indent(out) <<
+        "- " << function_signature(&recv_function) << endl;
+      scope_up(out);
+           
+      // TODO(mcslee): Message validation here, was the seqid etc ok?
+
+      // check for an exception
+      out <<
+        indent() << "int msgType = 0;" << endl <<
+        indent() << "[inProtocol readMessageBeginWithName: nil type: &msgType sequenceID: NULL];" << endl <<
+        indent() << "if (msgType == TMessageType_EXCEPTION) {" << endl <<
+        indent() << "  TApplicationException * x = [TApplicationException read: inProtocol];" << endl <<
+        indent() << "  [inProtocol readMessageEnd];" << endl <<
+        indent() << "  @throw x;" << endl <<
+        indent() << "}" << endl;
+
+      // FIXME - could optimize here to reduce creation of temporary objects.
+      string resultname = function_result_helper_struct_type(*f_iter);
+      out <<
+        indent() << cocoa_prefix_ << resultname << " * result = [[[" << cocoa_prefix_ << 
+        resultname << " alloc] init] autorelease];" << endl;
+      indent(out) << "[result read: inProtocol];" << endl;
+      indent(out) << "[inProtocol readMessageEnd];" << endl;
+
+      // Careful, only return _result if not a void function
+      if (!(*f_iter)->get_returntype()->is_void()) {
+        out <<
+          indent() << "if ([result successIsSet]) {" << endl <<
+          indent() << "  return [result success];" << endl <<
+          indent() << "}" << endl;
+      }
+
+      t_struct* xs = (*f_iter)->get_xceptions();
+      const std::vector<t_field*>& xceptions = xs->get_members();
+      vector<t_field*>::const_iterator x_iter;
+      for (x_iter = xceptions.begin(); x_iter != xceptions.end(); ++x_iter) {
+        out <<
+          indent() << "if ([result " << (*x_iter)->get_name() << "IsSet]) {" << endl <<
+          indent() << "  @throw [result " << (*x_iter)->get_name() << "];" << endl <<
+          indent() << "}" << endl;
+      }
+
+      // If you get here it's an exception, unless a void function
+      if ((*f_iter)->get_returntype()->is_void()) {
+        indent(out) <<
+          "return;" << endl;
+      } else {
+        out <<
+          indent() << "@throw [TApplicationException exceptionWithType: TApplicationException_MISSING_RESULT" << endl <<
+          indent() << "                                        message: @\"" << (*f_iter)->get_name() << " failed: unknown result\"];" << endl;
+      }
+      
+      // Close function
+      scope_down(out);
+      out << endl;
+    }
+
+    // Open function
+    indent(out) <<
+      "- " << function_signature(*f_iter) << endl;
+    scope_up(out);
+    indent(out) <<
+      "[self send_" << funname;
+
+    // Declare the function arguments
+    bool first = true;
+    for (fld_iter = fields.begin(); fld_iter != fields.end(); ++fld_iter) {
+      if (first) {
+        first = false;
+      } else {
+        out << " ";
+      }
+      out << ": " << (*fld_iter)->get_name();
+    }
+    out << "];" << endl;
+
+    if (!(*f_iter)->is_async()) {
+      out << indent();
+      if (!(*f_iter)->get_returntype()->is_void()) {
+        out << "return ";
+      }
+      out <<
+        "[self recv_" << funname << "];" << endl;
+    }
+    scope_down(out);
+    out << endl;
+  }
+
+  indent_down();
+
+  out << "@end" << endl << endl;
+}
+
+
+/**
+ * Deserializes a field of any type.
+ *
+ * @param tfield The field
+ * @param fieldName The variable name for this field
+ */
+void t_cocoa_generator::generate_deserialize_field(ofstream& out,
+                                                   t_field* tfield,
+                                                   string fieldName) {
+  t_type* type = get_true_type(tfield->get_type());
+
+  if (type->is_void()) {
+    throw "CANNOT GENERATE DESERIALIZE CODE FOR void TYPE: " +
+      tfield->get_name();
+  }
+
+  if (type->is_struct() || type->is_xception()) {
+    generate_deserialize_struct(out,
+                                (t_struct*)type,
+                                fieldName);
+  } else if (type->is_container()) {
+    generate_deserialize_container(out, type, fieldName);
+  } else if (type->is_base_type() || type->is_enum()) {
+    indent(out) <<
+      type_name(type) << " " << fieldName << " = [inProtocol ";
+    
+    if (type->is_base_type()) {
+      t_base_type::t_base tbase = ((t_base_type*)type)->get_base();
+      switch (tbase) {
+      case t_base_type::TYPE_VOID:
+        throw "compiler error: cannot serialize void field in a struct: " +
+          tfield->get_name();
+        break;
+      case t_base_type::TYPE_STRING:        
+        if (((t_base_type*)type)->is_binary()) {
+          out << "readBinary];";
+        } else {
+          out << "readString];";
+        }
+        break;
+      case t_base_type::TYPE_BOOL:
+        out << "readBool];";
+        break;
+      case t_base_type::TYPE_BYTE:
+        out << "readByte];";
+        break;
+      case t_base_type::TYPE_I16:
+        out << "readI16];";
+        break;
+      case t_base_type::TYPE_I32:
+        out << "readI32];";
+        break;
+      case t_base_type::TYPE_I64:
+        out << "readI64];";
+        break;
+      case t_base_type::TYPE_DOUBLE:
+        out << "readDouble];";
+        break;
+      default:
+        throw "compiler error: no Objective-C name for base type " + t_base_type::t_base_name(tbase);
+      }
+    } else if (type->is_enum()) {
+      out << "readI32];";
+    }
+    out <<
+      endl;
+  } else {
+    printf("DO NOT KNOW HOW TO DESERIALIZE FIELD '%s' TYPE '%s'\n",
+           tfield->get_name().c_str(), type_name(type).c_str());
+  }
+}
+
+/**
+ * Generates an unserializer for a struct, allocates the struct and invokes read:
+ */
+void t_cocoa_generator::generate_deserialize_struct(ofstream& out,
+                                                    t_struct* tstruct,
+                                                    string fieldName) {
+  indent(out) << type_name(tstruct) << fieldName << " = [[" << 
+    type_name(tstruct, true) << " alloc] init];" << endl;
+  indent(out) << "[" << fieldName << " read: inProtocol];" << endl;
+}
+
+/**
+ * Deserializes a container by reading its size and then iterating
+ */
+void t_cocoa_generator::generate_deserialize_container(ofstream& out,
+                                                       t_type* ttype,
+                                                       string fieldName) {
+  string size = tmp("_size");
+  indent(out) << "int " << size << ";" << endl;
+
+  // Declare variables, read header
+  if (ttype->is_map()) {
+    indent(out) 
+      << "[inProtocol readMapBeginWithKeyType: NULL valueType: NULL size: &" <<
+      size << "];" << endl;
+    indent(out) << "NSMutableDictionary * " << fieldName << 
+      " = [[NSMutableDictionary alloc] initWithCapacity: " << size << "];" << endl;
+  } else if (ttype->is_set()) {
+    indent(out) 
+      << "[inProtocol readSetBeginWithElementType: NULL size: &" << size << "];" << endl;
+    indent(out) << "NSMutableSet * " << fieldName << 
+      " = [[NSMutableSet alloc] initWithCapacity: " << size << "];" << endl;
+  } else if (ttype->is_list()) {
+    indent(out) 
+      << "[inProtocol readListBeginWithElementType: NULL size: &" << size << "];" << endl;
+    indent(out) << "NSMutableArray * " << fieldName << 
+      " = [[NSMutableArray alloc] initWithCapacity: " << size << "];" << endl;
+  }
+  // FIXME - the code above does not verify that the element types of
+  // the containers being read match the element types of the
+  // containers we are reading into.  Does that matter?
+
+  // For loop iterates over elements
+  string i = tmp("_i");
+  indent(out) << "int " << i << ";" << endl <<
+    indent() << "for (" << i << " = 0; " <<
+    i << " < " << size << "; " <<
+    "++" << i << ")" << endl;
+  
+    scope_up(out);
+    
+    if (ttype->is_map()) {
+      generate_deserialize_map_element(out, (t_map*)ttype, fieldName);
+    } else if (ttype->is_set()) {
+      generate_deserialize_set_element(out, (t_set*)ttype, fieldName);
+    } else if (ttype->is_list()) {
+      generate_deserialize_list_element(out, (t_list*)ttype, fieldName);
+    }
+    
+    scope_down(out);
+
+  // Read container end
+  if (ttype->is_map()) {
+    indent(out) << "[inProtocol readMapEnd];" << endl;
+  } else if (ttype->is_set()) {
+    indent(out) << "[inProtocol readSetEnd];" << endl;
+  } else if (ttype->is_list()) {
+    indent(out) << "[inProtocol readListEnd];" << endl;
+  }
+
+}
+
+
+/**
+ * Take a variable of a given type and wrap it in code to make it
+ * suitable for putting into a container, if necessary.  Basically,
+ * wrap scaler primitives in NSNumber objects.
+ */
+string t_cocoa_generator::containerize(t_type * ttype,
+                                       string fieldName)
+{
+  // FIXME - optimize here to avoid autorelease pool?
+  ttype = get_true_type(ttype);
+  if (ttype->is_enum()) {
+    return "[NSNumber numberWithInt: " + fieldName + "]";
+  } else if (ttype->is_base_type()) {
+    t_base_type::t_base tbase = ((t_base_type*)ttype)->get_base();
+    switch (tbase) {
+    case t_base_type::TYPE_VOID:
+      throw "can't containerize void";
+    case t_base_type::TYPE_BOOL:
+      return "[NSNumber numberWithBool: " + fieldName + "]";
+    case t_base_type::TYPE_BYTE:
+      return "[NSNumber numberWithUnsignedChar: " + fieldName + "]";
+    case t_base_type::TYPE_I16:
+      return "[NSNumber numberWithShort: " + fieldName + "]";
+    case t_base_type::TYPE_I32:
+      return "[NSNumber numberWithLong: " + fieldName + "]";
+    case t_base_type::TYPE_I64:
+      return "[NSNumber numberWithLongLong: " + fieldName + "]";
+    case t_base_type::TYPE_DOUBLE:
+      return "[NSNumber numberWithDouble: " + fieldName + "]";
+    default:
+      break;
+    }
+  }
+
+  // do nothing
+  return fieldName;
+}
+
+
+/**
+ * Generates code to deserialize a map element
+ */
+void t_cocoa_generator::generate_deserialize_map_element(ofstream& out,
+                                                         t_map* tmap,
+                                                         string fieldName) {
+  string key = tmp("_key");
+  string val = tmp("_val");
+  t_field fkey(tmap->get_key_type(), key);
+  t_field fval(tmap->get_val_type(), val);
+
+  generate_deserialize_field(out, &fkey, key);
+  generate_deserialize_field(out, &fval, val);
+
+  indent(out) <<
+    "[" << fieldName << " setObject: " << containerize(fval.get_type(), val) <<
+    " forKey: " << containerize(fkey.get_type(), key) << "];" << endl;
+}
+
+/**
+ * Deserializes a set element
+ */
+void t_cocoa_generator::generate_deserialize_set_element(ofstream& out,
+                                                         t_set* tset,
+                                                         string fieldName) {
+  string elem = tmp("_elem");
+  t_field felem(tset->get_elem_type(), elem);
+
+  generate_deserialize_field(out, &felem, elem);
+
+  indent(out) <<
+    "[" << fieldName << " addObject: " << containerize(felem.get_type(), elem) << "];" << endl;
+}
+
+/**
+ * Deserializes a list element
+ */
+void t_cocoa_generator::generate_deserialize_list_element(ofstream& out,
+                                                          t_list* tlist,
+                                                          string fieldName) {
+  string elem = tmp("_elem");
+  t_field felem(tlist->get_elem_type(), elem);
+
+  generate_deserialize_field(out, &felem, elem);
+
+  indent(out) <<
+    "[" << fieldName << " addObject: " << containerize(felem.get_type(), elem) << "];" << endl;
+}
+
+
+/**
+ * Serializes a field of any type.
+ *
+ * @param tfield The field to serialize
+ * @param fieldName Name to of the variable holding the field
+ */
+void t_cocoa_generator::generate_serialize_field(ofstream& out,
+                                                 t_field* tfield,
+                                                 string fieldName) {
+  t_type* type = get_true_type(tfield->get_type());
+
+  // Do nothing for void types
+  if (type->is_void()) {
+    throw "CANNOT GENERATE SERIALIZE CODE FOR void TYPE: " +
+      tfield->get_name();
+  }
+  
+  if (type->is_struct() || type->is_xception()) {
+    generate_serialize_struct(out,
+                              (t_struct*)type,
+                              fieldName);
+  } else if (type->is_container()) {
+    generate_serialize_container(out,
+                                 type,
+                                 fieldName);
+  } else if (type->is_base_type() || type->is_enum()) {
+    indent(out) <<
+      "[outProtocol ";
+    
+    if (type->is_base_type()) {
+      t_base_type::t_base tbase = ((t_base_type*)type)->get_base();
+      switch (tbase) {
+      case t_base_type::TYPE_VOID:
+        throw
+          "compiler error: cannot serialize void field in a struct: " + fieldName;
+        break;
+      case t_base_type::TYPE_STRING:
+        if (((t_base_type*)type)->is_binary()) {
+          out << "writeBinary: " << fieldName << "];";
+        } else {
+          out << "writeString: " << fieldName << "];";
+        }
+        break;
+      case t_base_type::TYPE_BOOL:
+        out << "writeBool: " << fieldName << "];";
+        break;
+      case t_base_type::TYPE_BYTE:
+        out << "writeByte: " << fieldName << "];";
+        break;
+      case t_base_type::TYPE_I16:
+        out << "writeI16: " << fieldName << "];";
+        break;
+      case t_base_type::TYPE_I32:
+        out << "writeI32: " << fieldName << "];";
+        break;
+      case t_base_type::TYPE_I64:
+        out << "writeI64: " << fieldName << "];";
+        break;
+      case t_base_type::TYPE_DOUBLE:
+        out << "writeDouble: " << fieldName << "];";
+        break;
+      default:
+        throw "compiler error: no Java name for base type " + t_base_type::t_base_name(tbase);
+      }
+    } else if (type->is_enum()) {
+      out << "writeI32: " << fieldName << "];";
+    }
+    out << endl;
+  } else {
+    printf("DO NOT KNOW HOW TO SERIALIZE FIELD '%s' TYPE '%s'\n",
+           tfield->get_name().c_str(),
+           type_name(type).c_str());
+  }
+}
+
+/**
+ * Serialize a struct.
+ *
+ * @param tstruct The struct to serialize
+ * @param fieldName Name of variable holding struct
+ */
+void t_cocoa_generator::generate_serialize_struct(ofstream& out,
+                                                  t_struct* tstruct,
+                                                  string fieldName) {
+  out <<
+    indent() << "[" << fieldName << " write: outProtocol];" << endl;
+}
+
+/**
+ * Serializes a container by writing its size then the elements.
+ *
+ * @param ttype  The type of container
+ * @param fieldName Name of variable holding container
+ */
+void t_cocoa_generator::generate_serialize_container(ofstream& out,
+                                                     t_type* ttype,
+                                                     string fieldName) {
+  scope_up(out);
+  
+  if (ttype->is_map()) {
+    indent(out) <<
+      "[outProtocol writeMapBeginWithKeyType: " <<
+      type_to_enum(((t_map*)ttype)->get_key_type()) << " valueType: " <<
+      type_to_enum(((t_map*)ttype)->get_val_type()) << " size: [" <<
+      fieldName << " count]];" << endl;
+  } else if (ttype->is_set()) {
+    indent(out) <<
+      "[outProtocol writeSetBeginWithElementType: " <<
+      type_to_enum(((t_set*)ttype)->get_elem_type()) << " size: [" <<
+      fieldName << " count]];" << endl;
+  } else if (ttype->is_list()) {
+    indent(out) <<
+      "[outProtocol writeListBeginWithElementType: " <<
+      type_to_enum(((t_list*)ttype)->get_elem_type()) << " size: [" <<
+      fieldName << " count]];" << endl;
+  }
+
+  string iter = tmp("_iter");
+  string key;
+  if (ttype->is_map()) {
+    key = tmp("key");
+    indent(out) << "NSEnumerator * " << iter << " = [" << fieldName << " keyEnumerator];" << endl;
+    indent(out) << "id " << key << ";" << endl;
+    indent(out) << "while ((" << key << " = [" << iter << " nextObject]))" << endl;
+  } else if (ttype->is_set()) {
+    key = tmp("obj");
+    indent(out) << "NSEnumerator * " << iter << " = [" << fieldName << " objectEnumerator];" << endl;
+    indent(out) << "id " << key << ";" << endl;
+    indent(out) << "while ((" << key << " = [" << iter << " nextObject]))" << endl;
+  } else if (ttype->is_list()) {
+    key = tmp("i");
+    indent(out) << "int " << key << ";" << endl;
+    indent(out) <<
+      "for (" << key << " = 0; " << key << " < [" << fieldName << " count]; " << key << "++)" << endl;
+  }
+
+    scope_up(out);
+
+    if (ttype->is_map()) {
+      generate_serialize_map_element(out, (t_map*)ttype, key, fieldName);
+    } else if (ttype->is_set()) {
+      generate_serialize_set_element(out, (t_set*)ttype, key);
+    } else if (ttype->is_list()) {
+      generate_serialize_list_element(out, (t_list*)ttype, key, fieldName);
+    }
+    
+    scope_down(out);
+    
+    if (ttype->is_map()) {
+      indent(out) <<
+        "[outProtocol writeMapEnd];" << endl;
+    } else if (ttype->is_set()) {
+      indent(out) <<
+        "[outProtocol writeSetEnd];" << endl;
+    } else if (ttype->is_list()) {
+      indent(out) <<
+        "[outProtocol writeListEnd];" << endl;
+    }
+    
+  scope_down(out);  
+}
+
+/**
+ * Given a field variable name, wrap it in code that converts it to a
+ * primitive type, if necessary.
+ */
+string t_cocoa_generator::decontainerize(t_field * tfield,
+                                         string fieldName)
+{
+  t_type * ttype = get_true_type(tfield->get_type());
+  if (ttype->is_enum()) {
+    return "[" + fieldName + " intValue]";
+  } else if (ttype->is_base_type()) {
+    t_base_type::t_base tbase = ((t_base_type*)ttype)->get_base();
+    switch (tbase) {
+    case t_base_type::TYPE_VOID:
+      throw "can't decontainerize void";
+    case t_base_type::TYPE_BOOL:
+      return "[" + fieldName + " boolValue]";
+    case t_base_type::TYPE_BYTE:
+      return "[" + fieldName + " unsignedCharValue]";
+    case t_base_type::TYPE_I16:
+      return "[" + fieldName + " shortValue]";
+    case t_base_type::TYPE_I32:
+      return "[" + fieldName + " longValue]";
+    case t_base_type::TYPE_I64:
+      return "[" + fieldName + " longLongValue]";
+    case t_base_type::TYPE_DOUBLE:
+      return "[" + fieldName + " doubleValue]";
+    default:
+      break;
+    }
+  }
+
+  // do nothing
+  return fieldName;
+}
+
+
+/**
+ * Serializes the members of a map.
+ */ 
+void t_cocoa_generator::generate_serialize_map_element(ofstream& out,
+                                                       t_map* tmap,
+                                                       string key,
+                                                       string mapName) {
+  t_field kfield(tmap->get_key_type(), key);
+  generate_serialize_field(out, &kfield, decontainerize(&kfield, key));
+  t_field vfield(tmap->get_val_type(), "[" + mapName + " objectForKey: " + key + "]");
+  generate_serialize_field(out, &vfield, decontainerize(&vfield, vfield.get_name()));
+}
+
+/**
+ * Serializes the members of a set.
+ */
+void t_cocoa_generator::generate_serialize_set_element(ofstream& out,
+                                                       t_set* tset,
+                                                       string elementName) {
+  t_field efield(tset->get_elem_type(), elementName);
+  generate_serialize_field(out, &efield, decontainerize(&efield, elementName));
+}
+
+/**
+ * Serializes the members of a list.
+ */
+void t_cocoa_generator::generate_serialize_list_element(ofstream& out,
+                                                        t_list* tlist,
+                                                        string index,
+                                                        string listName) {
+  t_field efield(tlist->get_elem_type(), "[" + listName + " objectAtIndex: " + index + "]");
+  generate_serialize_field(out, &efield, decontainerize(&efield, efield.get_name()));
+}
+
+
+/**
+ * Returns an Objective-C name
+ *
+ * @param ttype The type
+ * @param class_ref Do we want a Class reference istead of a type reference?
+ * @return Java type name, i.e. HashMap<Key,Value>
+ */
+string t_cocoa_generator::type_name(t_type* ttype, bool class_ref) {
+  if (ttype->is_typedef()) {
+    return cocoa_prefix_ + ttype->get_name();
+  }
+
+  string result;
+  if (ttype->is_base_type()) {
+    return base_type_name((t_base_type*)ttype);
+  } else if (ttype->is_enum()) {
+    return "int";
+  } else if (ttype->is_map()) {
+    result = "NSDictionary";
+  } else if (ttype->is_set()) {
+    result = "NSSet";
+  } else if (ttype->is_list()) {
+    result = "NSArray";
+  } else {
+    // Check for prefix
+    t_program* program = ttype->get_program();
+    if (program != NULL) {
+      result = program->get_cocoa_prefix() + ttype->get_name();
+    } else {
+      result = ttype->get_name();
+    }
+  }
+
+  if (!class_ref) {
+    result += " *";
+  }
+  return result;
+}
+
+/**
+ * Returns the Objective-C type that corresponds to the thrift type.
+ *
+ * @param tbase The base type
+ */
+string t_cocoa_generator::base_type_name(t_base_type* type) {
+  t_base_type::t_base tbase = type->get_base();
+
+  switch (tbase) {
+  case t_base_type::TYPE_VOID:
+    return "void";
+  case t_base_type::TYPE_STRING:
+    if (type->is_binary()) {
+      return "NSData *";
+    } else {
+      return "NSString *";
+    }
+  case t_base_type::TYPE_BOOL:
+    return "BOOL";
+  case t_base_type::TYPE_BYTE:
+    return "uint8_t";
+  case t_base_type::TYPE_I16:
+    return"int16_t";
+  case t_base_type::TYPE_I32:
+    return "int32_t";
+  case t_base_type::TYPE_I64:
+    return"int64_t";
+  case t_base_type::TYPE_DOUBLE:
+    return "double";
+  default:
+    throw "compiler error: no objective-c name for base type " + t_base_type::t_base_name(tbase);
+  }
+}
+
+
+/**
+ * Spit out code that evaluates to the specified constant value.
+ */
+string t_cocoa_generator::render_const_value(string name, 
+                                             t_type* type, 
+                                             t_const_value* value,
+                                             bool containerize_it) {
+  std::ostringstream render;
+
+  if (type->is_base_type()) {
+    t_base_type::t_base tbase = ((t_base_type*)type)->get_base();
+    switch (tbase) {
+    case t_base_type::TYPE_STRING:
+      render << "@\"" + value->get_string() + "\"";
+      break;
+    case t_base_type::TYPE_BOOL:
+      render << ((value->get_integer() > 0) ? "YES" : "NO");
+      break;
+    case t_base_type::TYPE_BYTE:
+    case t_base_type::TYPE_I16:
+    case t_base_type::TYPE_I32:
+    case t_base_type::TYPE_I64:
+      render << value->get_integer();
+      break;
+    case t_base_type::TYPE_DOUBLE:
+      if (value->get_type() == t_const_value::CV_INTEGER) {
+        render << value->get_integer();
+      } else {
+        render << value->get_double();
+      }
+      break;
+    default:
+      throw "compiler error: no const of base type " + t_base_type::t_base_name(tbase);
+    }
+  } else if (type->is_enum()) {
+    render << value->get_integer();
+  } else if (type->is_struct() || type->is_xception()) {
+    render << "[[" << type_name(type, true) << " alloc] initWith";
+    const vector<t_field*>& fields = ((t_struct*)type)->get_members();
+    vector<t_field*>::const_iterator f_iter;
+    const map<t_const_value*, t_const_value*>& val = value->get_map();
+    map<t_const_value*, t_const_value*>::const_iterator v_iter;
+    bool first = true;
+    for (v_iter = val.begin(); v_iter != val.end(); ++v_iter) {
+      t_type* field_type = NULL;
+      for (f_iter = fields.begin(); f_iter != fields.end(); ++f_iter) {
+        if ((*f_iter)->get_name() == v_iter->first->get_string()) {
+          field_type = (*f_iter)->get_type();
+        }
+      }
+      if (field_type == NULL) {
+        throw "type error: " + type->get_name() + " has no field " + v_iter->first->get_string();
+      }
+      if (first) {
+        render << capitalize(v_iter->first->get_string());
+        first = false;
+      } else {
+        render << " " << v_iter->first->get_string();
+      }
+      render << ": " << render_const_value(name, field_type, v_iter->second);
+    }
+    render << "]";
+  } else if (type->is_map()) {
+    render << "[[NSDictionary alloc] initWithObjectsAndKeys: ";
+    t_type* ktype = ((t_map*)type)->get_key_type();
+    t_type* vtype = ((t_map*)type)->get_val_type();
+    const map<t_const_value*, t_const_value*>& val = value->get_map();
+    map<t_const_value*, t_const_value*>::const_iterator v_iter;
+    bool first = true;
+    for (v_iter = val.begin(); v_iter != val.end(); ++v_iter) {
+      string key = render_const_value(name, ktype, v_iter->first, true);
+      string val = render_const_value(name, vtype, v_iter->second, true);
+      if (first) {
+        first = false;
+      } else {
+        render << ", ";
+      }
+      render << val << ", " << key;
+    }
+    render << ", nil]";
+  } else if (type->is_list()) {
+    render << "[[NSArray alloc] initWithObjects: ";
+    t_type * etype = ((t_list*)type)->get_elem_type();
+    const vector<t_const_value*>& val = value->get_list();
+    bool first = true;
+    vector<t_const_value*>::const_iterator v_iter;
+    for (v_iter = val.begin(); v_iter != val.end(); ++v_iter) {
+      if (first) {
+        first = false;
+      } else {
+        render << ", ";
+      }
+      render << render_const_value(name, etype, *v_iter, true);
+    }
+    render << ", nil]";
+  } else if (type->is_set()) {
+    render << "[[NSSet alloc] initWithObjects: ";
+    t_type * etype = ((t_set*)type)->get_elem_type();
+    const vector<t_const_value*>& val = value->get_list();
+    bool first = true;
+    vector<t_const_value*>::const_iterator v_iter;
+    for (v_iter = val.begin(); v_iter != val.end(); ++v_iter) {
+      if (first) {
+        first = false;
+      } else {
+        render << ", ";
+      }
+      render << render_const_value(name, etype, *v_iter, true);
+    }
+    render << ", nil]";
+  } else {
+    throw "don't know how to render constant for type: " + type->get_name();
+  }
+
+  if (containerize_it) {
+    return containerize(type, render.str());
+  }
+
+  return render.str();
+}
+
+
+/**
+ * Declares a field.
+ *
+ * @param ttype The type
+ */
+string t_cocoa_generator::declare_field(t_field* tfield) {
+  return type_name(tfield->get_type()) + " __" + tfield->get_name() + ";";
+}
+
+/**
+ * Renders a function signature
+ *
+ * @param tfunction Function definition
+ * @return String of rendered function definition
+ */
+string t_cocoa_generator::function_signature(t_function* tfunction) {
+  t_type* ttype = tfunction->get_returntype();
+  std::string result =
+    "(" + type_name(ttype) + ") " + tfunction->get_name() + argument_list(tfunction->get_arglist());
+  return result;
+}
+
+
+/**
+ * Renders a colon separated list of types and names, suitable for an
+ * objective-c parameter list
+ */
+string t_cocoa_generator::argument_list(t_struct* tstruct) {
+  string result = "";
+
+  const vector<t_field*>& fields = tstruct->get_members();
+  vector<t_field*>::const_iterator f_iter;
+  bool first = true;
+  for (f_iter = fields.begin(); f_iter != fields.end(); ++f_iter) {
+    if (first) {
+      first = false;
+    } else {
+      result += " ";
+    }
+    result += ": (" + type_name((*f_iter)->get_type()) + ") " + (*f_iter)->get_name();
+  }
+  return result;
+}
+
+
+/**
+ * Converts the parse type to an Objective-C enum string for the given type.
+ */
+string t_cocoa_generator::type_to_enum(t_type* type) {
+  type = get_true_type(type);
+  
+  if (type->is_base_type()) {
+    t_base_type::t_base tbase = ((t_base_type*)type)->get_base();
+    switch (tbase) {
+    case t_base_type::TYPE_VOID:
+      throw "NO T_VOID CONSTRUCT";
+    case t_base_type::TYPE_STRING:
+      return "TType_STRING";
+    case t_base_type::TYPE_BOOL:
+      return "TType_BOOL";
+    case t_base_type::TYPE_BYTE:
+      return "TType_BYTE";
+    case t_base_type::TYPE_I16:
+      return "TType_I16";
+    case t_base_type::TYPE_I32:
+      return "TType_I32";
+    case t_base_type::TYPE_I64:
+      return "TType_I64";
+    case t_base_type::TYPE_DOUBLE:
+      return "TType_DOUBLE";
+    }
+  } else if (type->is_enum()) {
+    return "TType_I32";
+  } else if (type->is_struct() || type->is_xception()) {
+    return "TType_STRUCT";
+  } else if (type->is_map()) {
+    return "TType_MAP";
+  } else if (type->is_set()) {
+    return "TType_SET";
+  } else if (type->is_list()) {
+    return "TType_LIST";
+  }
+
+  throw "INVALID TYPE IN type_to_enum: " + type->get_name();
+}
+
+
+/**
+ * Returns a format string specifier for the supplied parse type.
+ */
+string t_cocoa_generator::format_string_for_type(t_type* type) {
+  type = get_true_type(type);
+  
+  if (type->is_base_type()) {
+    t_base_type::t_base tbase = ((t_base_type*)type)->get_base();
+    switch (tbase) {
+    case t_base_type::TYPE_VOID:
+      throw "NO T_VOID CONSTRUCT";
+    case t_base_type::TYPE_STRING:
+      return "\\\"%@\\\"";
+    case t_base_type::TYPE_BOOL:
+      return "%i";
+    case t_base_type::TYPE_BYTE:
+      return "%i";
+    case t_base_type::TYPE_I16:
+      return "%hi";
+    case t_base_type::TYPE_I32:
+      return "%i";
+    case t_base_type::TYPE_I64:
+      return "%qi";
+    case t_base_type::TYPE_DOUBLE:
+      return "%f";
+    }
+  } else if (type->is_enum()) {
+    return "%i";
+  } else if (type->is_struct() || type->is_xception()) {
+    return "%@";
+  } else if (type->is_map()) {
+    return "%@";
+  } else if (type->is_set()) {
+    return "%@";
+  } else if (type->is_list()) {
+    return "%@";
+  }
+
+  throw "INVALID TYPE IN format_string_for_type: " + type->get_name();
+}
+
+/**
+ * Generate a call to a field's setter.
+ *
+ * @param tfield Field the setter is being called on
+ * @param fieldName Name of variable to pass to setter
+ */
+
+string t_cocoa_generator::call_field_setter(t_field* tfield, string fieldName) {
+  return "[self set" + capitalize(tfield->get_name()) + ": " + fieldName + "];";
+}
diff --git a/compiler/cpp/src/generate/t_cocoa_generator.h b/compiler/cpp/src/generate/t_cocoa_generator.h
new file mode 100644
index 0000000..1696c20
--- /dev/null
+++ b/compiler/cpp/src/generate/t_cocoa_generator.h
@@ -0,0 +1,181 @@
+// Copyright (c) 2006- Facebook
+// Distributed under the Thrift Software License
+//
+// See accompanying file LICENSE or visit the Thrift site at:
+// http://developers.facebook.com/thrift/
+
+#ifndef T_COCOA_GENERATOR_H
+#define T_COCOA_GENERATOR_H
+
+#include <string>
+#include <fstream>
+#include <iostream>
+#include <vector>
+
+#include "t_oop_generator.h"
+
+// TODO(mcslee: Paramaterize the output dir
+#define T_COCOA_DIR "gen-cocoa"
+
+/**
+ * Objective-C code generator.
+ *
+ * @author Andrew McGeachie <geechorama@gmail.com>, although it was
+ * mostly copy/pasting/tweaking from mcslee's work.
+ */
+class t_cocoa_generator : public t_oop_generator {
+ public:
+  t_cocoa_generator(t_program* program) :
+    t_oop_generator(program) {}
+
+  /**
+   * Init and close methods
+   */
+
+  void init_generator();
+  void close_generator();
+
+  void generate_consts(std::vector<t_const*> consts);
+
+  /**
+   * Program-level generation functions
+   */
+
+  void generate_typedef (t_typedef*  ttypedef);
+  void generate_enum    (t_enum*     tenum);
+  void generate_struct  (t_struct*   tstruct);
+  void generate_xception(t_struct*   txception);
+  void generate_service (t_service*  tservice);
+
+  void print_const_value(std::ofstream& out, std::string name, t_type* type, t_const_value* value);
+  std::string render_const_value(std::string name, t_type* type, t_const_value* value,
+                                 bool containerize_it=false);
+
+  void generate_cocoa_struct(t_struct* tstruct, bool is_exception);
+  void generate_cocoa_struct_interface(std::ofstream& out, t_struct* tstruct, bool is_xception=false);
+  void generate_cocoa_struct_implementation(std::ofstream& out, t_struct* tstruct, bool is_xception=false, bool is_result=false);
+  void generate_cocoa_struct_initializer_signature(std::ofstream& out,
+                                                  t_struct* tstruct);
+  void generate_cocoa_struct_field_accessor_declarations(std::ofstream& out,
+                                                        t_struct* tstruct,
+                                                        bool is_exception);
+  void generate_cocoa_struct_field_accessor_implementations(std::ofstream& out,
+                                                           t_struct* tstruct,
+                                                           bool is_exception);
+  void generate_cocoa_struct_reader(std::ofstream& out, t_struct* tstruct);
+  void generate_cocoa_struct_result_writer(std::ofstream& out, t_struct* tstruct);
+  void generate_cocoa_struct_writer(std::ofstream& out, t_struct* tstruct);
+  void generate_cocoa_struct_description(std::ofstream& out, t_struct* tstruct);
+
+  std::string function_result_helper_struct_type(t_function* tfunction);
+  void generate_function_helpers(t_function* tfunction);
+
+  /**
+   * Service-level generation functions
+   */
+
+  void generate_cocoa_service_protocol (std::ofstream& out, t_service* tservice);
+  void generate_cocoa_service_client_interface (std::ofstream& out, t_service* tservice);
+  void generate_cocoa_service_client_implementation (std::ofstream& out, t_service* tservice);
+  void generate_cocoa_service_helpers   (t_service* tservice);
+  void generate_service_client    (t_service* tservice);
+  void generate_service_server    (t_service* tservice);
+  void generate_process_function  (t_service* tservice, t_function* tfunction);
+
+  /**
+   * Serialization constructs
+   */
+
+  void generate_deserialize_field        (std::ofstream& out,
+                                          t_field*    tfield, 
+                                          std::string fieldName);
+  
+  void generate_deserialize_struct       (std::ofstream& out,
+                                          t_struct*   tstruct,
+                                          std::string prefix="");
+  
+  void generate_deserialize_container    (std::ofstream& out,
+                                          t_type*     ttype,
+                                          std::string prefix="");
+  
+  void generate_deserialize_set_element  (std::ofstream& out,
+                                          t_set*      tset,
+                                          std::string prefix="");
+
+  void generate_deserialize_map_element  (std::ofstream& out,
+                                          t_map*      tmap,
+                                          std::string prefix="");
+
+  void generate_deserialize_list_element (std::ofstream& out,
+                                          t_list*     tlist,
+                                          std::string prefix="");
+
+  void generate_serialize_field          (std::ofstream& out,
+                                          t_field*    tfield,
+                                          std::string prefix="");
+
+  void generate_serialize_struct         (std::ofstream& out,
+                                          t_struct*   tstruct,
+                                          std::string fieldName="");
+
+  void generate_serialize_container      (std::ofstream& out,
+                                          t_type*     ttype,
+                                          std::string prefix="");
+
+  void generate_serialize_map_element    (std::ofstream& out,
+                                          t_map*      tmap,
+                                          std::string iter,
+                                          std::string map);
+
+  void generate_serialize_set_element    (std::ofstream& out,
+                                          t_set*      tmap,
+                                          std::string iter);
+
+  void generate_serialize_list_element   (std::ofstream& out,
+                                          t_list*     tlist,
+                                          std::string index,
+                                          std::string listName);
+
+  /**
+   * Helper rendering functions
+   */
+
+  std::string cocoa_prefix();
+  std::string cocoa_imports();
+  std::string cocoa_thrift_imports();
+  std::string type_name(t_type* ttype, bool class_ref=false);
+  std::string base_type_name(t_base_type* tbase);
+  std::string declare_field(t_field* tfield);
+  std::string function_signature(t_function* tfunction);
+  std::string argument_list(t_struct* tstruct);
+  std::string type_to_enum(t_type* ttype);
+  std::string format_string_for_type(t_type* type);
+  std::string call_field_setter(t_field* tfield, std::string fieldName);
+  std::string containerize(t_type * ttype, std::string fieldName);
+  std::string decontainerize(t_field * tfield, std::string fieldName);
+
+  bool type_can_be_null(t_type* ttype) {
+    ttype = get_true_type(ttype);
+
+    return
+      ttype->is_container() || 
+      ttype->is_struct() ||
+      ttype->is_xception() ||
+      ttype->is_string();
+  }
+
+ private:
+
+  std::string cocoa_prefix_;
+  std::string constants_declarations_;
+
+  /**
+   * File streams
+   */
+
+  std::ofstream f_header_;
+  std::ofstream f_impl_;
+
+};
+
+#endif
diff --git a/compiler/cpp/src/main.cc b/compiler/cpp/src/main.cc
index 4362029..015d1ba 100644
--- a/compiler/cpp/src/main.cc
+++ b/compiler/cpp/src/main.cc
@@ -38,6 +38,7 @@
 #include "generate/t_ocaml_generator.h"
 #include "generate/t_erl_generator.h"
 #include "generate/t_hs_generator.h"
+#include "generate/t_cocoa_generator.h"
 
 using namespace std;
 
@@ -142,6 +143,7 @@
 bool gen_ocaml = false;
 bool gen_erl = false;
 bool gen_hs = false;
+bool gen_cocoa = false;
 bool gen_dense = false;
 bool gen_recurse = false;
 
@@ -563,6 +565,7 @@
   fprintf(stderr, "  -ocaml      Generate OCaml output files\n");
   fprintf(stderr, "  -erl        Generate Erlang output files\n");
   fprintf(stderr, "  -hs         Generate Haskell output files\n");
+  fprintf(stderr, "  -cocoa      Generate Cocoa/Objective-C output files\n");
   fprintf(stderr, "  -I dir      Add a directory to the list of directories\n");
   fprintf(stderr, "                searched for include directives\n");
   fprintf(stderr, "  -dense      Generate metadata for TDenseProtocol (C++)\n");
@@ -860,6 +863,12 @@
       hs->generate_program();
       delete hs;
     }
+    if (gen_cocoa) {
+      pverbose("Generating Cocoa/Objective-C\n");
+      t_cocoa_generator* cocoa = new t_cocoa_generator(program);
+      cocoa->generate_program();
+      delete cocoa;
+    }
     if (dump_docs) {
       dump_docstrings(program);
     }
@@ -938,6 +947,8 @@
         gen_erl = true;
       } else if (strcmp(arg, "-hs") == 0) {
         gen_hs = true;
+      } else if (strcmp(arg, "-cocoa") == 0) {
+        gen_cocoa = true;
       } else if (strcmp(arg, "-I") == 0) {
         // An argument of "-I\ asdf" is invalid and has unknown results
         arg = argv[++i];
@@ -958,7 +969,7 @@
   }
 
   // You gotta generate something!
-  if (!gen_cpp && !gen_java && !gen_javabean && !gen_php && !gen_phpi && !gen_py && !gen_rb && !gen_xsd && !gen_perl && !gen_ocaml && !gen_erl && !gen_hs) {
+  if (!gen_cpp && !gen_java && !gen_javabean && !gen_php && !gen_phpi && !gen_py && !gen_rb && !gen_xsd && !gen_perl && !gen_ocaml && !gen_erl && !gen_hs && !gen_cocoa) {
     fprintf(stderr, "!!! No output language(s) specified\n\n");
     usage();
   }
diff --git a/compiler/cpp/src/parse/t_program.h b/compiler/cpp/src/parse/t_program.h
index 8420847..f7516a3 100644
--- a/compiler/cpp/src/parse/t_program.h
+++ b/compiler/cpp/src/parse/t_program.h
@@ -170,6 +170,14 @@
     return perl_package_;
   }
 
+  void set_cocoa_prefix(std::string cocoa_prefix) {
+    cocoa_prefix_ = cocoa_prefix;
+  }
+
+  const std::string& get_cocoa_prefix() const {
+    return cocoa_prefix_;
+  }
+
  private:
 
   // File path
@@ -219,6 +227,10 @@
   // Perl namespace
   std::string perl_package_;
 
+  // Cocoa/Objective-C naming prefix
+  std::string cocoa_prefix_;
+
+
 };
 
 #endif
diff --git a/compiler/cpp/src/thriftl.ll b/compiler/cpp/src/thriftl.ll
index fbad955..baaef5c 100644
--- a/compiler/cpp/src/thriftl.ll
+++ b/compiler/cpp/src/thriftl.ll
@@ -71,6 +71,7 @@
 "cpp_include"    { return tok_cpp_include;    }
 "cpp_type"       { return tok_cpp_type;       }
 "java_package"   { return tok_java_package;   }
+"cocoa_prefix"   { return tok_cocoa_prefix;   }
 "php_namespace"  { return tok_php_namespace;  }
 "py_module"      { return tok_py_module;      }
 "perl_package"   { return tok_perl_package;   }
diff --git a/compiler/cpp/src/thrifty.yy b/compiler/cpp/src/thrifty.yy
index 8533805..a96bfc4 100644
--- a/compiler/cpp/src/thrifty.yy
+++ b/compiler/cpp/src/thrifty.yy
@@ -84,6 +84,7 @@
 %token tok_xsd_namespace
 %token tok_xsd_attrs
 %token tok_ruby_namespace
+%token tok_cocoa_prefix
 
 /**
  * Base datatype keywords
@@ -298,6 +299,13 @@
         g_program->set_java_package($2);
       }
     }
+| tok_cocoa_prefix tok_identifier
+    {
+      pdebug("Header -> tok_cocoa_prefix tok_identifier");
+      if (g_parse_mode == PROGRAM) {
+        g_program->set_cocoa_prefix($2);
+      }
+    }
 | tok_xsd_namespace tok_literal
     {
       pdebug("Header -> tok_xsd_namespace tok_literal");