__cplusplus value should not be used to decide for std::unique_ptr open-source-parsers#350:

In addition to the C++ language version define __cplusplus also check _CPPLIB_VER for better Dinkumware support.

Author: Dani-Hub

src/lib_json/json_reader.cpp

@@ -43,7 +43,7 @@ static int       stackDepth_g = 0;  // see readValue()
 
 namespace Json {
 
-#if __cplusplus >= 201103L
+#if __cplusplus >= 201103L || (defined(_CPPLIB_VER) && _CPPLIB_VER >= 520)
 typedef std::unique_ptr<CharReader> CharReaderPtr;
 #else
 typedef std::auto_ptr<CharReader>   CharReaderPtr;

src/lib_json/json_writer.cpp

@@ -54,7 +54,7 @@
 
 namespace Json {
 
-#if __cplusplus >= 201103L
+#if __cplusplus >= 201103L || (defined(_CPPLIB_VER) && _CPPLIB_VER >= 520)
 typedef std::unique_ptr<StreamWriter> StreamWriterPtr;
 #else
 typedef std::auto_ptr<StreamWriter>   StreamWriterPtr;