add check for C++17 constexpr if

2017-12-18 22:10:01 +08:00 · 2017-12-18 22:10:01 +08:00 · 1e551f4e55
commit 1e551f4e55
parent 81018c21fd
1 changed files with 5 additions and 0 deletions
--- a/include/nana/c++defines.hpp
+++ b/include/nana/c++defines.hpp
@ -199,6 +199,11 @@
 #	define _enable_std_clamp
 #endif

+#undef _nana_cxx_constexpr_if
+#if (defined(_MSC_VER) && (_MSC_VER >= 1912) && defined(_MSVC_LANG) && _MSVC_LANG>= 201703)
+#	define _nana_cxx_constexpr_if
+#endif
+

 #if defined(NANA_WINDOWS)
 	#ifndef _UNICODE