C++ Thrift coding style changes

Summary: Make underscore for class members consistent


git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@664818 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/lib/cpp/src/concurrency/PosixThreadFactory.h b/lib/cpp/src/concurrency/PosixThreadFactory.h
index a56999c..4ad9933 100644
--- a/lib/cpp/src/concurrency/PosixThreadFactory.h
+++ b/lib/cpp/src/concurrency/PosixThreadFactory.h
@@ -79,7 +79,7 @@
   
  private:
   class Impl;
-  shared_ptr<Impl> _impl;
+  shared_ptr<Impl> impl_;
 };
 
 }}} // facebook::thrift::concurrency