ddfb6adb98
In my #8489 we want to use boost's small_vector type, but that PR is kinda messy by adding boost and also making a meaningful change. So here I'm splitting out the boost addition to its own PR so that one can be more focused on the allocation improvement and consumption of boost.
353 lines
9.5 KiB
C++
353 lines
9.5 KiB
C++
// (C) Copyright Douglas Gregor 2010
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//
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// Use, modification and distribution are subject to the
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// Boost Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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// See http://www.boost.org for most recent version.
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// Clang compiler setup.
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#define BOOST_HAS_PRAGMA_ONCE
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// Detecting `-fms-extension` compiler flag assuming that _MSC_VER defined when that flag is used.
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#if defined (_MSC_VER) && (__clang_major__ > 3 || (__clang_major__ == 3 && __clang_minor__ >= 4))
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# define BOOST_HAS_PRAGMA_DETECT_MISMATCH
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#endif
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// When compiling with clang before __has_extension was defined,
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// even if one writes 'defined(__has_extension) && __has_extension(xxx)',
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// clang reports a compiler error. So the only workaround found is:
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#ifndef __has_extension
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#define __has_extension __has_feature
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#endif
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#ifndef __has_attribute
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#define __has_attribute(x) 0
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#endif
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#ifndef __has_cpp_attribute
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#define __has_cpp_attribute(x) 0
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#endif
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#if !__has_feature(cxx_exceptions) && !defined(BOOST_NO_EXCEPTIONS)
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# define BOOST_NO_EXCEPTIONS
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#endif
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#if !__has_feature(cxx_rtti) && !defined(BOOST_NO_RTTI)
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# define BOOST_NO_RTTI
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#endif
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#if !__has_feature(cxx_rtti) && !defined(BOOST_NO_TYPEID)
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# define BOOST_NO_TYPEID
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#endif
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#if !__has_feature(cxx_thread_local)
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# define BOOST_NO_CXX11_THREAD_LOCAL
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#endif
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#ifdef __is_identifier
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#if !__is_identifier(__int64) && !defined(__GNUC__)
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# define BOOST_HAS_MS_INT64
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#endif
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#endif
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#if __has_include(<stdint.h>)
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# define BOOST_HAS_STDINT_H
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#endif
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#if (defined(linux) || defined(__linux) || defined(__linux__) || defined(__GNU__) || defined(__GLIBC__)) && !defined(_CRAYC)
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#if (__clang_major__ >= 4) && defined(__has_include)
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#if __has_include(<quadmath.h>)
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# define BOOST_HAS_FLOAT128
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#endif
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#endif
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#endif
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#define BOOST_HAS_NRVO
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// Branch prediction hints
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#if !defined (__c2__) && defined(__has_builtin)
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#if __has_builtin(__builtin_expect)
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#define BOOST_LIKELY(x) __builtin_expect(x, 1)
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#define BOOST_UNLIKELY(x) __builtin_expect(x, 0)
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#endif
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#endif
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// Clang supports "long long" in all compilation modes.
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#define BOOST_HAS_LONG_LONG
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//
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// We disable this if the compiler is really nvcc with C++03 as it
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// doesn't actually support __int128 as of CUDA_VERSION=7500
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// even though it defines __SIZEOF_INT128__.
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// See https://svn.boost.org/trac/boost/ticket/10418
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// https://svn.boost.org/trac/boost/ticket/11852
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// Only re-enable this for nvcc if you're absolutely sure
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// of the circumstances under which it's supported.
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// Similarly __SIZEOF_INT128__ is defined when targetting msvc
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// compatibility even though the required support functions are absent.
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//
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#if defined(__CUDACC__)
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# if defined(BOOST_GCC_CXX11)
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# define BOOST_NVCC_CXX11
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# else
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# define BOOST_NVCC_CXX03
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# endif
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#endif
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#if defined(__SIZEOF_INT128__) && !defined(BOOST_NVCC_CXX03) && !defined(_MSC_VER)
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# define BOOST_HAS_INT128
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#endif
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//
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// Dynamic shared object (DSO) and dynamic-link library (DLL) support
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//
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#if defined(_WIN32) || defined(__WIN32__) || defined(WIN32) || defined(__CYGWIN__)
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# define BOOST_HAS_DECLSPEC
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# define BOOST_SYMBOL_EXPORT __attribute__((__dllexport__))
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# define BOOST_SYMBOL_IMPORT __attribute__((__dllimport__))
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#else
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# define BOOST_SYMBOL_EXPORT __attribute__((__visibility__("default")))
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# define BOOST_SYMBOL_VISIBLE __attribute__((__visibility__("default")))
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# define BOOST_SYMBOL_IMPORT
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#endif
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//
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// The BOOST_FALLTHROUGH macro can be used to annotate implicit fall-through
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// between switch labels.
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//
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#if __cplusplus >= 201103L && defined(__has_warning)
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# if __has_feature(cxx_attributes) && __has_warning("-Wimplicit-fallthrough")
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# define BOOST_FALLTHROUGH [[clang::fallthrough]]
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# endif
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#endif
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#if !__has_feature(cxx_auto_type)
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# define BOOST_NO_CXX11_AUTO_DECLARATIONS
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# define BOOST_NO_CXX11_AUTO_MULTIDECLARATIONS
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#endif
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//
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// Currently clang on Windows using VC++ RTL does not support C++11's char16_t or char32_t
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//
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#if (defined(_MSC_VER) && (_MSC_VER < 1900)) || !(defined(__GXX_EXPERIMENTAL_CXX0X__) || __cplusplus >= 201103L)
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# define BOOST_NO_CXX11_CHAR16_T
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# define BOOST_NO_CXX11_CHAR32_T
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#endif
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#if defined(_MSC_VER) && (_MSC_VER >= 1800) && !defined(__GNUC__)
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#define BOOST_HAS_EXPM1
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#define BOOST_HAS_LOG1P
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#endif
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#if !__has_feature(cxx_constexpr)
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# define BOOST_NO_CXX11_CONSTEXPR
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#endif
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#if !__has_feature(cxx_decltype)
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# define BOOST_NO_CXX11_DECLTYPE
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#endif
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#if !__has_feature(cxx_decltype_incomplete_return_types)
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# define BOOST_NO_CXX11_DECLTYPE_N3276
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#endif
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#if !__has_feature(cxx_defaulted_functions)
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# define BOOST_NO_CXX11_DEFAULTED_FUNCTIONS
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#endif
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#if !__has_feature(cxx_deleted_functions)
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# define BOOST_NO_CXX11_DELETED_FUNCTIONS
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#endif
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#if !__has_feature(cxx_explicit_conversions)
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# define BOOST_NO_CXX11_EXPLICIT_CONVERSION_OPERATORS
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#endif
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#if !__has_feature(cxx_default_function_template_args)
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# define BOOST_NO_CXX11_FUNCTION_TEMPLATE_DEFAULT_ARGS
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#endif
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#if !__has_feature(cxx_generalized_initializers)
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# define BOOST_NO_CXX11_HDR_INITIALIZER_LIST
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#endif
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#if !__has_feature(cxx_lambdas)
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# define BOOST_NO_CXX11_LAMBDAS
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#endif
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#if !__has_feature(cxx_local_type_template_args)
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# define BOOST_NO_CXX11_LOCAL_CLASS_TEMPLATE_PARAMETERS
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#endif
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#if !__has_feature(cxx_noexcept)
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# define BOOST_NO_CXX11_NOEXCEPT
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#endif
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#if !__has_feature(cxx_nullptr)
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# define BOOST_NO_CXX11_NULLPTR
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#endif
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#if !__has_feature(cxx_range_for)
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# define BOOST_NO_CXX11_RANGE_BASED_FOR
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#endif
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#if !__has_feature(cxx_raw_string_literals)
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# define BOOST_NO_CXX11_RAW_LITERALS
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#endif
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#if !__has_feature(cxx_reference_qualified_functions)
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# define BOOST_NO_CXX11_REF_QUALIFIERS
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#endif
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#if !__has_feature(cxx_generalized_initializers)
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# define BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX
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#endif
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#if !__has_feature(cxx_rvalue_references)
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# define BOOST_NO_CXX11_RVALUE_REFERENCES
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#endif
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#if !__has_feature(cxx_strong_enums)
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# define BOOST_NO_CXX11_SCOPED_ENUMS
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#endif
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#if !__has_feature(cxx_static_assert)
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# define BOOST_NO_CXX11_STATIC_ASSERT
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#endif
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#if !__has_feature(cxx_alias_templates)
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# define BOOST_NO_CXX11_TEMPLATE_ALIASES
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#endif
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#if !__has_feature(cxx_unicode_literals)
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# define BOOST_NO_CXX11_UNICODE_LITERALS
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#endif
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#if !__has_feature(cxx_variadic_templates)
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# define BOOST_NO_CXX11_VARIADIC_TEMPLATES
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#endif
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#if !__has_feature(cxx_user_literals)
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# define BOOST_NO_CXX11_USER_DEFINED_LITERALS
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#endif
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#if !__has_feature(cxx_alignas)
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# define BOOST_NO_CXX11_ALIGNAS
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#endif
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#if !__has_feature(cxx_trailing_return)
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# define BOOST_NO_CXX11_TRAILING_RESULT_TYPES
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#endif
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#if !__has_feature(cxx_inline_namespaces)
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# define BOOST_NO_CXX11_INLINE_NAMESPACES
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#endif
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#if !__has_feature(cxx_override_control)
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# define BOOST_NO_CXX11_FINAL
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#endif
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#if !__has_feature(cxx_unrestricted_unions)
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# define BOOST_NO_CXX11_UNRESTRICTED_UNION
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#endif
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#if !(__has_feature(__cxx_binary_literals__) || __has_extension(__cxx_binary_literals__))
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# define BOOST_NO_CXX14_BINARY_LITERALS
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#endif
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#if !__has_feature(__cxx_decltype_auto__)
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# define BOOST_NO_CXX14_DECLTYPE_AUTO
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#endif
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#if !__has_feature(__cxx_aggregate_nsdmi__)
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# define BOOST_NO_CXX14_AGGREGATE_NSDMI
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#endif
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#if !__has_feature(__cxx_init_captures__)
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# define BOOST_NO_CXX14_INITIALIZED_LAMBDA_CAPTURES
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#endif
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#if !__has_feature(__cxx_generic_lambdas__)
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# define BOOST_NO_CXX14_GENERIC_LAMBDAS
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#endif
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// clang < 3.5 has a defect with dependent type, like following.
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//
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// template <class T>
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// constexpr typename enable_if<pred<T> >::type foo(T &)
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// { } // error: no return statement in constexpr function
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//
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// This issue also affects C++11 mode, but C++11 constexpr requires return stmt.
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// Therefore we don't care such case.
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//
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// Note that we can't check Clang version directly as the numbering system changes depending who's
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// creating the Clang release (see https://github.com/boostorg/config/pull/39#issuecomment-59927873)
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// so instead verify that we have a feature that was introduced at the same time as working C++14
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// constexpr (generic lambda's in this case):
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//
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#if !__has_feature(__cxx_generic_lambdas__) || !__has_feature(__cxx_relaxed_constexpr__)
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# define BOOST_NO_CXX14_CONSTEXPR
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#endif
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#if !__has_feature(__cxx_return_type_deduction__)
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# define BOOST_NO_CXX14_RETURN_TYPE_DEDUCTION
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#endif
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#if !__has_feature(__cxx_variable_templates__)
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# define BOOST_NO_CXX14_VARIABLE_TEMPLATES
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#endif
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#if !defined(__cpp_structured_bindings) || (__cpp_structured_bindings < 201606)
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# define BOOST_NO_CXX17_STRUCTURED_BINDINGS
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#endif
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#if !defined(__cpp_if_constexpr) || (__cpp_if_constexpr < 201606)
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# define BOOST_NO_CXX17_IF_CONSTEXPR
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#endif
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// Clang 3.9+ in c++1z
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#if !__has_cpp_attribute(fallthrough) || __cplusplus < 201406L
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# define BOOST_NO_CXX17_INLINE_VARIABLES
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# define BOOST_NO_CXX17_FOLD_EXPRESSIONS
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#endif
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#if __cplusplus < 201103L
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#define BOOST_NO_CXX11_SFINAE_EXPR
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#endif
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#if __cplusplus < 201400
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// All versions with __cplusplus above this value seem to support this:
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# define BOOST_NO_CXX14_DIGIT_SEPARATORS
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#endif
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//
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// __builtin_unreachable:
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#if defined(__has_builtin) && __has_builtin(__builtin_unreachable)
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#define BOOST_UNREACHABLE_RETURN(x) __builtin_unreachable();
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#endif
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#if (__clang_major__ == 3) && (__clang_minor__ == 0)
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// Apparently a clang bug:
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# define BOOST_NO_CXX11_FIXED_LENGTH_VARIADIC_TEMPLATE_EXPANSION_PACKS
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#endif
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// Clang has supported the 'unused' attribute since the first release.
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#define BOOST_ATTRIBUTE_UNUSED __attribute__((__unused__))
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// Type aliasing hint.
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#if __has_attribute(__may_alias__)
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# define BOOST_MAY_ALIAS __attribute__((__may_alias__))
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#endif
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#ifndef BOOST_COMPILER
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# define BOOST_COMPILER "Clang version " __clang_version__
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#endif
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// Macro used to identify the Clang compiler.
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#define BOOST_CLANG 1
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