remove stdcxx namespace and use std directly
diff --git a/lib/cpp/test/concurrency/ThreadFactoryTests.h b/lib/cpp/test/concurrency/ThreadFactoryTests.h
index 48330f3..ba98502 100644
--- a/lib/cpp/test/concurrency/ThreadFactoryTests.h
+++ b/lib/cpp/test/concurrency/ThreadFactoryTests.h
@@ -33,7 +33,7 @@
 namespace concurrency {
 namespace test {
 
-using stdcxx::shared_ptr;
+using std::shared_ptr;
 using namespace apache::thrift::concurrency;
 
 /**