include/mpark/config.hpp

   1 // MPark.Variant
   2 //
   3 // Copyright Michael Park, 2015-2017
   4 //
   5 // Distributed under the Boost Software License, Version 1.0.
   6 // (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
   7
   8 #ifndef MPARK_CONFIG_HPP
   9 #define MPARK_CONFIG_HPP
  10
  11 // MSVC 2015 Update 3.
  12 #if __cplusplus < 201103L && (!defined(_MSC_VER) || _MSC_FULL_VER < 190024210)
  13 #error "MPark.Variant requires C++11 support."
  14 #endif
  15
  16 #ifndef __has_builtin
  17 #define __has_builtin(x) 0
  18 #endif
  19
  20 #ifndef __has_include
  21 #define __has_include(x) 0
  22 #endif
  23
  24 #ifndef __has_feature
  25 #define __has_feature(x) 0
  26 #endif
  27
  28 #if __has_builtin(__builtin_addressof) || \
  29     (defined(__GNUC__) && __GNUC__ >= 7) || defined(_MSC_VER)
  30 #define MPARK_BUILTIN_ADDRESSOF
  31 #endif
  32
  33 #if __has_builtin(__builtin_unreachable)
  34 #define MPARK_BUILTIN_UNREACHABLE
  35 #endif
  36
  37 #if __has_builtin(__type_pack_element)
  38 #define MPARK_TYPE_PACK_ELEMENT
  39 #endif
  40
  41 #if defined(__cpp_constexpr) && __cpp_constexpr >= 201304
  42 #define MPARK_CPP14_CONSTEXPR
  43 #endif
  44
  45 #if __has_feature(cxx_exceptions) || defined(__cpp_exceptions) || \
  46     (defined(_MSC_VER) && defined(_CPPUNWIND))
  47 #define MPARK_EXCEPTIONS
  48 #endif
  49
  50 #if defined(__cpp_generic_lambdas) || defined(_MSC_VER)
  51 #define MPARK_GENERIC_LAMBDAS
  52 #endif
  53
  54 #if defined(__cpp_lib_integer_sequence)
  55 #define MPARK_INTEGER_SEQUENCE
  56 #endif
  57
  58 #if defined(__cpp_return_type_deduction) || defined(_MSC_VER)
  59 #define MPARK_RETURN_TYPE_DEDUCTION
  60 #endif
  61
  62 #if defined(__cpp_lib_transparent_operators) || defined(_MSC_VER)
  63 #define MPARK_TRANSPARENT_OPERATORS
  64 #endif
  65
  66 #if defined(__cpp_variable_templates) || defined(_MSC_VER)
  67 #define MPARK_VARIABLE_TEMPLATES
  68 #endif
  69
  70 #if !defined(__GLIBCXX__) || __has_include(<codecvt>)  // >= libstdc++-5
  71 #define MPARK_TRIVIALITY_TYPE_TRAITS
  72 #endif
  73
  74 #endif  // MPARK_CONFIG_HPP