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fix logical error on detecting std::clamp feature

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This commit is contained in:
Jinhao 2017-07-02 22:58:31 +08:00
parent 4bc03d038a
commit 735de4f032
1 changed files with 13 additions and 11 deletions
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22
include/nana/c++defines.hpp
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@ -112,10 +112,6 @@
# define STD_CODECVT_NOT_SUPPORTED
# endif // _MSC_VER == 1900
# if (_MSC_VER < 1910) //VS2017 RTM
# define _enable_std_clamp
# endif
#elif defined(__clang__) //Clang
#include <iosfwd> //Introduces some implement-specific flags of ISO C++ Library
@ -195,13 +191,19 @@
# endif
#endif
#ifndef _MSC_VER
//Detects the feature std::clamp
//Visual C++ 2017 with /std:c++latest provides the std::clamp
#if !defined(_MSVC_LANG) || (_MSVC_LANG < 201403L)
// std::clamp's feature test macro is defined inside <algorithm>
# include <algorithm>
# if (!defined(__cpp_lib_clamp)) || (__cpp_lib_clamp < 201603)
# ifndef _enable_std_clamp
# define _enable_std_clamp
# endif
// But nana still avoids introducing <algorithm> on MSVC.
# ifndef _MSC_VER
# include <algorithm>
# endif
# if ((!defined(__cpp_lib_clamp)) || (__cpp_lib_clamp < 201603)) && (!defined(_enable_std_clamp))
# define _enable_std_clamp
# endif
#endif