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1 // (C) Copyright Douglas Gregor 2010
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2 //
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3 // Use, modification and distribution are subject to the
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4 // Boost Software License, Version 1.0. (See accompanying file
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5 // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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6
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7 // See http://www.boost.org for most recent version.
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8
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9 // Clang compiler setup.
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10
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11 #define BOOST_HAS_PRAGMA_ONCE
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12
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13 // Detecting `-fms-extension` compiler flag assuming that _MSC_VER defined when that flag is used.
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14 #if defined (_MSC_VER) && (__clang_major__ > 3 || (__clang_major__ == 3 && __clang_minor__ >= 4))
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15 # define BOOST_HAS_PRAGMA_DETECT_MISMATCH
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16 #endif
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17
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18 // When compiling with clang before __has_extension was defined,
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19 // even if one writes 'defined(__has_extension) && __has_extension(xxx)',
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20 // clang reports a compiler error. So the only workaround found is:
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21
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22 #ifndef __has_extension
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23 #define __has_extension __has_feature
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24 #endif
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25
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26 #if !__has_feature(cxx_exceptions) && !defined(BOOST_NO_EXCEPTIONS)
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27 # define BOOST_NO_EXCEPTIONS
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28 #endif
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29
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30 #if !__has_feature(cxx_rtti) && !defined(BOOST_NO_RTTI)
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31 # define BOOST_NO_RTTI
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32 #endif
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33
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34 #if !__has_feature(cxx_rtti) && !defined(BOOST_NO_TYPEID)
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35 # define BOOST_NO_TYPEID
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36 #endif
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37
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38 #if defined(__int64) && !defined(__GNUC__)
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39 # define BOOST_HAS_MS_INT64
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40 #endif
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41
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42 #define BOOST_HAS_NRVO
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43
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44 // Branch prediction hints
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45 #if defined(__has_builtin)
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46 #if __has_builtin(__builtin_expect)
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47 #define BOOST_LIKELY(x) __builtin_expect(x, 1)
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48 #define BOOST_UNLIKELY(x) __builtin_expect(x, 0)
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49 #endif
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50 #endif
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51
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52 // Clang supports "long long" in all compilation modes.
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53 #define BOOST_HAS_LONG_LONG
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54
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55 //
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56 // We disable this if the compiler is really nvcc as it
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57 // doesn't actually support __int128 as of CUDA_VERSION=5000
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58 // even though it defines __SIZEOF_INT128__.
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59 // See https://svn.boost.org/trac/boost/ticket/10418
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60 // Only re-enable this for nvcc if you're absolutely sure
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61 // of the circumstances under which it's supported:
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62 //
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63 #if defined(__SIZEOF_INT128__) && !defined(__CUDACC__)
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64 # define BOOST_HAS_INT128
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65 #endif
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66
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67
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68 //
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69 // Dynamic shared object (DSO) and dynamic-link library (DLL) support
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70 //
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71 #if !defined(_WIN32) && !defined(__WIN32__) && !defined(WIN32)
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72 # define BOOST_SYMBOL_EXPORT __attribute__((__visibility__("default")))
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73 # define BOOST_SYMBOL_IMPORT
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74 # define BOOST_SYMBOL_VISIBLE __attribute__((__visibility__("default")))
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75 #endif
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76
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77 //
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78 // The BOOST_FALLTHROUGH macro can be used to annotate implicit fall-through
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79 // between switch labels.
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80 //
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81 #if __cplusplus >= 201103L && defined(__has_warning)
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82 # if __has_feature(cxx_attributes) && __has_warning("-Wimplicit-fallthrough")
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83 # define BOOST_FALLTHROUGH [[clang::fallthrough]]
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84 # endif
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85 #endif
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86
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87 #if !__has_feature(cxx_auto_type)
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88 # define BOOST_NO_CXX11_AUTO_DECLARATIONS
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89 # define BOOST_NO_CXX11_AUTO_MULTIDECLARATIONS
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90 #endif
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91
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92 //
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93 // Currently clang on Windows using VC++ RTL does not support C++11's char16_t or char32_t
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94 //
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95 #if defined(_MSC_VER) || !(defined(__GXX_EXPERIMENTAL_CXX0X__) || __cplusplus >= 201103L)
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96 # define BOOST_NO_CXX11_CHAR16_T
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97 # define BOOST_NO_CXX11_CHAR32_T
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98 #endif
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99
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100 #if !__has_feature(cxx_constexpr)
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101 # define BOOST_NO_CXX11_CONSTEXPR
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102 #endif
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103
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104 #if !__has_feature(cxx_decltype)
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105 # define BOOST_NO_CXX11_DECLTYPE
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106 #endif
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107
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108 #if !__has_feature(cxx_decltype_incomplete_return_types)
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109 # define BOOST_NO_CXX11_DECLTYPE_N3276
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110 #endif
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111
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112 #if !__has_feature(cxx_defaulted_functions)
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113 # define BOOST_NO_CXX11_DEFAULTED_FUNCTIONS
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114 #endif
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115
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116 #if !__has_feature(cxx_deleted_functions)
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117 # define BOOST_NO_CXX11_DELETED_FUNCTIONS
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118 #endif
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119
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120 #if !__has_feature(cxx_explicit_conversions)
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121 # define BOOST_NO_CXX11_EXPLICIT_CONVERSION_OPERATORS
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122 #endif
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123
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124 #if !__has_feature(cxx_default_function_template_args)
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125 # define BOOST_NO_CXX11_FUNCTION_TEMPLATE_DEFAULT_ARGS
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126 #endif
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127
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128 #if !__has_feature(cxx_generalized_initializers)
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129 # define BOOST_NO_CXX11_HDR_INITIALIZER_LIST
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130 #endif
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131
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132 #if !__has_feature(cxx_lambdas)
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133 # define BOOST_NO_CXX11_LAMBDAS
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134 #endif
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135
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136 #if !__has_feature(cxx_local_type_template_args)
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137 # define BOOST_NO_CXX11_LOCAL_CLASS_TEMPLATE_PARAMETERS
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138 #endif
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139
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140 #if !__has_feature(cxx_noexcept)
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141 # define BOOST_NO_CXX11_NOEXCEPT
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142 #endif
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143
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144 #if !__has_feature(cxx_nullptr)
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145 # define BOOST_NO_CXX11_NULLPTR
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146 #endif
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147
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148 #if !__has_feature(cxx_range_for)
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149 # define BOOST_NO_CXX11_RANGE_BASED_FOR
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150 #endif
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151
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152 #if !__has_feature(cxx_raw_string_literals)
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153 # define BOOST_NO_CXX11_RAW_LITERALS
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154 #endif
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155
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156 #if !__has_feature(cxx_reference_qualified_functions)
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157 # define BOOST_NO_CXX11_REF_QUALIFIERS
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158 #endif
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159
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160 #if !__has_feature(cxx_generalized_initializers)
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161 # define BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX
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162 #endif
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163
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164 #if !__has_feature(cxx_rvalue_references)
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165 # define BOOST_NO_CXX11_RVALUE_REFERENCES
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166 #endif
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167
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168 #if !__has_feature(cxx_strong_enums)
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169 # define BOOST_NO_CXX11_SCOPED_ENUMS
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170 #endif
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171
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172 #if !__has_feature(cxx_static_assert)
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173 # define BOOST_NO_CXX11_STATIC_ASSERT
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174 #endif
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175
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176 #if !__has_feature(cxx_alias_templates)
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177 # define BOOST_NO_CXX11_TEMPLATE_ALIASES
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178 #endif
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179
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180 #if !__has_feature(cxx_unicode_literals)
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181 # define BOOST_NO_CXX11_UNICODE_LITERALS
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182 #endif
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183
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184 #if !__has_feature(cxx_variadic_templates)
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185 # define BOOST_NO_CXX11_VARIADIC_TEMPLATES
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186 #endif
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187
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188 #if !__has_feature(cxx_user_literals)
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189 # define BOOST_NO_CXX11_USER_DEFINED_LITERALS
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190 #endif
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191
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192 #if !__has_feature(cxx_alignas)
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193 # define BOOST_NO_CXX11_ALIGNAS
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194 #endif
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195
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196 #if !__has_feature(cxx_trailing_return)
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197 # define BOOST_NO_CXX11_TRAILING_RESULT_TYPES
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198 #endif
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199
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200 #if !__has_feature(cxx_inline_namespaces)
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201 # define BOOST_NO_CXX11_INLINE_NAMESPACES
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202 #endif
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203
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204 #if !__has_feature(cxx_override_control)
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205 # define BOOST_NO_CXX11_FINAL
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206 #endif
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207
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208 #if !(__has_feature(__cxx_binary_literals__) || __has_extension(__cxx_binary_literals__))
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209 # define BOOST_NO_CXX14_BINARY_LITERALS
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210 #endif
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211
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212 #if !__has_feature(__cxx_decltype_auto__)
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213 # define BOOST_NO_CXX14_DECLTYPE_AUTO
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214 #endif
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215
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216 #if !__has_feature(__cxx_aggregate_nsdmi__)
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217 # define BOOST_NO_CXX14_AGGREGATE_NSDMI
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218 #endif
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219
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220 #if !__has_feature(__cxx_init_captures__)
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221 # define BOOST_NO_CXX14_INITIALIZED_LAMBDA_CAPTURES
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222 #endif
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223
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224 #if !__has_feature(__cxx_generic_lambdas__)
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225 # define BOOST_NO_CXX14_GENERIC_LAMBDAS
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226 #endif
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227
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228 // clang < 3.5 has a defect with dependent type, like following.
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229 //
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230 // template <class T>
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231 // constexpr typename enable_if<pred<T> >::type foo(T &)
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232 // { } // error: no return statement in constexpr function
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233 //
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234 // This issue also affects C++11 mode, but C++11 constexpr requires return stmt.
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235 // Therefore we don't care such case.
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236 //
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237 // Note that we can't check Clang version directly as the numbering system changes depending who's
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238 // creating the Clang release (see https://github.com/boostorg/config/pull/39#issuecomment-59927873)
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239 // so instead verify that we have a feature that was introduced at the same time as working C++14
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240 // constexpr (generic lambda's in this case):
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241 //
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242 #if !__has_feature(__cxx_generic_lambdas__) || !__has_feature(__cxx_relaxed_constexpr__)
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243 # define BOOST_NO_CXX14_CONSTEXPR
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244 #endif
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245
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246 #if !__has_feature(__cxx_return_type_deduction__)
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247 # define BOOST_NO_CXX14_RETURN_TYPE_DEDUCTION
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248 #endif
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249
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250 #if !__has_feature(__cxx_variable_templates__)
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251 # define BOOST_NO_CXX14_VARIABLE_TEMPLATES
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252 #endif
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253
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254 #if __cplusplus < 201400
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255 // All versions with __cplusplus above this value seem to support this:
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256 # define BOOST_NO_CXX14_DIGIT_SEPARATORS
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257 #endif
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258
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259
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260 // Unused attribute:
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261 #if defined(__GNUC__) && (__GNUC__ >= 4)
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262 # define BOOST_ATTRIBUTE_UNUSED __attribute__((unused))
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263 #endif
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264
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265 #ifndef BOOST_COMPILER
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266 # define BOOST_COMPILER "Clang version " __clang_version__
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267 #endif
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268
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269 // Macro used to identify the Clang compiler.
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270 #define BOOST_CLANG 1
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271
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