add a check for support of C++11 inline namespace

include/nana/c++defines.hpp

@@ -39,13 +39,15 @@
 #ifndef NANA_CXX_DEFINES_INCLUDED
 #define NANA_CXX_DEFINES_INCLUDED
 #define STD_FILESYSTEM_NOT_SUPPORTED
+
 //C++ language
 #if defined(_MSC_VER)
 #   undef STD_FILESYSTEM_NOT_SUPPORTED
 #	if (_MSC_VER < 1900)
 #		//Nana defines some macros for lack of support of keywords
 #		define _ALLOW_KEYWORD_MACROS
-#		
+#
+#		define CXX_NO_INLINE_NAMESPACE //no support of C++11 inline namespace until Visual C++ 2015
 #		define noexcept		//no support of noexcept until Visual C++ 2015
 #		define constexpr	//no support of constexpr until Visual C++ 2015
 #	endif

include/nana/filesystem/filesystem.hpp

@@ -42,8 +42,13 @@
 
  // namespace std { namespace experimental { namespace filesystem { inline namespace v1 {
 
-namespace nana  { namespace experimental { 	inline namespace v1
+namespace nana  { namespace experimental { 	
+
+#ifndef CXX_NO_INLINE_NAMESPACE
+inline namespace v1
 {
+#endif
+
 namespace filesystem
 {
 	enum class file_type 
@@ -367,8 +372,9 @@ namespace filesystem
 
 		return index ? path.substr(0, index + 1) : std::basic_string<CharType>();
 	}
-
+#ifndef CXX_NO_INLINE_NAMESPACE
 } //end namespace v1
+#endif
 } //end namespace filesystem
 } //end namespace experimental
 

source/filesystem/filesystem.cpp

@@ -38,7 +38,9 @@
 
 
 namespace nana {	namespace experimental {
+#ifndef CXX_NO_INLINE_NAMESPACE
 	inline namespace v1 {
+#endif
 	namespace filesystem
 	{
 		//class filesystem_error
@@ -870,7 +872,10 @@ namespace nana {	namespace experimental {
 				::chdir(p.c_str());
 #endif
 			}
+
+#ifndef CXX_NO_INLINE_NAMESPACE
 		} //end namespace v1
+#endif
 		}//end namespace filesystem
 	} //end namespace experimental
 }//end namespace nana