THRIFT-2905 Cocoa compiler should have option to produce "modern" Objective-C
Client: Cocoa (ObjectiveC & Swift)
Author: Kevin Wooten <kevin@wooten.com>

This closes #539
diff --git a/lib/cocoa/src/protocol/TProtocolError.m b/lib/cocoa/src/protocol/TProtocolError.m
new file mode 100644
index 0000000..953673b
--- /dev/null
+++ b/lib/cocoa/src/protocol/TProtocolError.m
@@ -0,0 +1,33 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+#import "TProtocolError.h"
+
+
+NSString *TProtocolErrorDomain = @"TProtocolErrorDomain";
+
+NSString *TProtocolErrorExtendedErrorKey = @"extendedError";
+NSString *TProtocolErrorFieldNameKey = @"field";
+NSString *TProtocolErrorExpectedIdKey = @"expectedId";
+NSString *TProtocolErrorExpectedVersionKey = @"expectedVersion";
+NSString *TProtocolErrorTypeKey = @"type";
+NSString *TProtocolErrorSourceLineKey = @"sourceLine";
+NSString *TProtocolErrorSourceFileKey = @"sourceFile";
+NSString *TProtocolErrorSourceMethodKey = @"sourceMethod";
+NSString *TProtocolErrorMessageNameKey = @"messageName";