third_party/boost/boost/config/compiler/visualc.hpp - SwiftShader - Git at Google

 //  (C) Copyright John Maddock 2001 - 2003.
 //  (C) Copyright Darin Adler 2001 - 2002.
 //  (C) Copyright Peter Dimov 2001.
 //  (C) Copyright Aleksey Gurtovoy 2002.
 //  (C) Copyright David Abrahams 2002 - 2003.
 //  (C) Copyright Beman Dawes 2002 - 2003.
 //  Use, modification and distribution are subject to the
 //  Boost Software License, Version 1.0. (See accompanying file
 //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

 //  See http://www.boost.org for most recent version.
 //
 //  Microsoft Visual C++ compiler setup:
 //
 //  We need to be careful with the checks in this file, as contrary
 //  to popular belief there are versions with _MSC_VER with the final
 //  digit non-zero (mainly the MIPS cross compiler).
 //
 //  So we either test _MSC_VER >= XXXX or else _MSC_VER < XXXX.
 //  No other comparisons (==, >, or <=) are safe.
 //

 #define BOOST_MSVC _MSC_VER

 //
 // Helper macro BOOST_MSVC_FULL_VER for use in Boost code:
 //
 #if _MSC_FULL_VER > 100000000
 #  define BOOST_MSVC_FULL_VER _MSC_FULL_VER
 #else
 #  define BOOST_MSVC_FULL_VER (_MSC_FULL_VER * 10)
 #endif

 // Attempt to suppress VC6 warnings about the length of decorated names (obsolete):
 #pragma warning( disable : 4503 ) // warning: decorated name length exceeded

 #define BOOST_HAS_PRAGMA_ONCE

 //
 // versions check:
 // we don't support Visual C++ prior to version 7.1:
 #if _MSC_VER < 1310
 #  error "Compiler not supported or configured - please reconfigure"
 #endif

 #if _MSC_FULL_VER < 180020827
 #  define BOOST_NO_FENV_H
 #endif

 #if _MSC_VER < 1400
 // although a conforming signature for swprint exists in VC7.1
 // it appears not to actually work:
 #  define BOOST_NO_SWPRINTF
 // Our extern template tests also fail for this compiler:
 #  define BOOST_NO_CXX11_EXTERN_TEMPLATE
 // Variadic macros do not exist for VC7.1 and lower
 #  define BOOST_NO_CXX11_VARIADIC_MACROS
 #  define BOOST_NO_CXX11_LOCAL_CLASS_TEMPLATE_PARAMETERS
 #endif

 #if _MSC_VER < 1500  // 140X == VC++ 8.0
 #  define BOOST_NO_MEMBER_TEMPLATE_FRIENDS
 #endif

 #if _MSC_VER < 1600  // 150X == VC++ 9.0
    // A bug in VC9:
 #  define BOOST_NO_ADL_BARRIER
 #endif


 #ifndef _NATIVE_WCHAR_T_DEFINED
 #  define BOOST_NO_INTRINSIC_WCHAR_T
 #endif

 //
 // check for exception handling support:
 #if !defined(_CPPUNWIND) && !defined(BOOST_NO_EXCEPTIONS)
 #  define BOOST_NO_EXCEPTIONS
 #endif

 //
 // __int64 support:
 //
 #define BOOST_HAS_MS_INT64
 #if defined(_MSC_EXTENSIONS) || (_MSC_VER >= 1400)
 #   define BOOST_HAS_LONG_LONG
 #else
 #   define BOOST_NO_LONG_LONG
 #endif
 #if (_MSC_VER >= 1400) && !defined(_DEBUG)
 #   define BOOST_HAS_NRVO
 #endif
 #if _MSC_VER >= 1600  // 160X == VC++ 10.0
 #  define BOOST_HAS_PRAGMA_DETECT_MISMATCH
 #endif
 //
 // disable Win32 API's if compiler extensions are
 // turned off:
 //
 #if !defined(_MSC_EXTENSIONS) && !defined(BOOST_DISABLE_WIN32)
 #  define BOOST_DISABLE_WIN32
 #endif
 #if !defined(_CPPRTTI) && !defined(BOOST_NO_RTTI)
 #  define BOOST_NO_RTTI
 #endif

 //
 // TR1 features:
 //
 #if (_MSC_VER >= 1700) && defined(_HAS_CXX17) && (_HAS_CXX17 > 0)
 // # define BOOST_HAS_TR1_HASH			// don't know if this is true yet.
 // # define BOOST_HAS_TR1_TYPE_TRAITS	// don't know if this is true yet.
 # define BOOST_HAS_TR1_UNORDERED_MAP
 # define BOOST_HAS_TR1_UNORDERED_SET
 #endif

 //
 // C++0x features
 //
 //   See above for BOOST_NO_LONG_LONG

 // C++ features supported by VC++ 10 (aka 2010)
 //
 #if _MSC_VER < 1600
 #  define BOOST_NO_CXX11_AUTO_DECLARATIONS
 #  define BOOST_NO_CXX11_AUTO_MULTIDECLARATIONS
 #  define BOOST_NO_CXX11_LAMBDAS
 #  define BOOST_NO_CXX11_RVALUE_REFERENCES
 #  define BOOST_NO_CXX11_STATIC_ASSERT
 #  define BOOST_NO_CXX11_NULLPTR
 #  define BOOST_NO_CXX11_DECLTYPE
 #endif // _MSC_VER < 1600

 #if _MSC_VER >= 1600
 #  define BOOST_HAS_STDINT_H
 #endif

 // C++11 features supported by VC++ 11 (aka 2012)
 //
 #if _MSC_VER < 1700
 #  define BOOST_NO_CXX11_FINAL
 #  define BOOST_NO_CXX11_RANGE_BASED_FOR
 #  define BOOST_NO_CXX11_SCOPED_ENUMS
 #endif // _MSC_VER < 1700

 // C++11 features supported by VC++ 12 (aka 2013).
 //
 #if _MSC_FULL_VER < 180020827
 #  define BOOST_NO_CXX11_DEFAULTED_FUNCTIONS
 #  define BOOST_NO_CXX11_DELETED_FUNCTIONS
 #  define BOOST_NO_CXX11_EXPLICIT_CONVERSION_OPERATORS
 #  define BOOST_NO_CXX11_FUNCTION_TEMPLATE_DEFAULT_ARGS
 #  define BOOST_NO_CXX11_RAW_LITERALS
 #  define BOOST_NO_CXX11_TEMPLATE_ALIASES
 #  define BOOST_NO_CXX11_TRAILING_RESULT_TYPES
 #  define BOOST_NO_CXX11_VARIADIC_TEMPLATES
 #  define BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX
 #  define BOOST_NO_CXX11_DECLTYPE_N3276
 #endif

 #if _MSC_FULL_VER >= 180020827
 #define BOOST_HAS_EXPM1
 #define BOOST_HAS_LOG1P
 #endif

 // C++11 features supported by VC++ 14 (aka 2015)
 //
 #if (_MSC_FULL_VER < 190023026)
 #  define BOOST_NO_CXX11_NOEXCEPT
 #  define BOOST_NO_CXX11_DEFAULTED_MOVES
 #  define BOOST_NO_CXX11_REF_QUALIFIERS
 #  define BOOST_NO_CXX11_USER_DEFINED_LITERALS
 #  define BOOST_NO_CXX11_ALIGNAS
 #  define BOOST_NO_CXX11_INLINE_NAMESPACES
 #  define BOOST_NO_CXX11_CHAR16_T
 #  define BOOST_NO_CXX11_CHAR32_T
 #  define BOOST_NO_CXX11_UNICODE_LITERALS
 #  define BOOST_NO_CXX14_DECLTYPE_AUTO
 #  define BOOST_NO_CXX14_INITIALIZED_LAMBDA_CAPTURES
 #  define BOOST_NO_CXX14_RETURN_TYPE_DEDUCTION
 #  define BOOST_NO_CXX14_BINARY_LITERALS
 #  define BOOST_NO_CXX14_GENERIC_LAMBDAS
 #  define BOOST_NO_CXX14_DIGIT_SEPARATORS
 #  define BOOST_NO_CXX11_THREAD_LOCAL
 #endif
 // C++11 features supported by VC++ 14 update 3 (aka 2015)
 //
 #if (_MSC_FULL_VER < 190024210)
 #  define BOOST_NO_CXX14_VARIABLE_TEMPLATES
 #  define BOOST_NO_SFINAE_EXPR
 #  define BOOST_NO_CXX11_CONSTEXPR
 #endif

 // C++14 features supported by VC++ 14.1 (Visual Studio 2017)
 //
 #if (_MSC_VER < 1910)
 #  define BOOST_NO_CXX14_AGGREGATE_NSDMI
 #endif

 // C++17 features supported by VC++ 14.1 (Visual Studio 2017) Update 3
 //
 #if (_MSC_VER < 1911) || (_MSVC_LANG < 201703)
 #  define BOOST_NO_CXX17_STRUCTURED_BINDINGS
 #  define BOOST_NO_CXX17_IF_CONSTEXPR
 #  define BOOST_NO_CXX17_HDR_OPTIONAL
 #  define BOOST_NO_CXX17_HDR_STRING_VIEW
 #endif

 // MSVC including version 14 has not yet completely
 // implemented value-initialization, as is reported:
 // "VC++ does not value-initialize members of derived classes without
 // user-declared constructor", reported in 2009 by Sylvester Hesp:
 // https://connect.microsoft.com/VisualStudio/feedback/details/484295
 // "Presence of copy constructor breaks member class initialization",
 // reported in 2009 by Alex Vakulenko:
 // https://connect.microsoft.com/VisualStudio/feedback/details/499606
 // "Value-initialization in new-expression", reported in 2005 by
 // Pavel Kuznetsov (MetaCommunications Engineering):
 // https://connect.microsoft.com/VisualStudio/feedback/details/100744
 // Reported again by John Maddock in 2015 for VC14:
 // https://connect.microsoft.com/VisualStudio/feedback/details/1582233/c-subobjects-still-not-value-initialized-correctly
 // See also: http://www.boost.org/libs/utility/value_init.htm#compiler_issues
 // (Niels Dekker, LKEB, May 2010)
 // Still present in VC15.5, Dec 2017.
 #define BOOST_NO_COMPLETE_VALUE_INITIALIZATION
 //
 // C++ 11:
 //
 // This is supported with /permissive- for 15.5 onwards, unfortunately we appear to have no way to tell
 // if this is in effect or not, in any case nothing in Boost is currently using this, so we'll just go
 // on defining it for now:
 //
 #  define BOOST_NO_TWO_PHASE_NAME_LOOKUP

 #if (_MSC_VER < 1912) || (_MSVC_LANG < 201402)
 // Supported from msvc-15.5 onwards:
 #define BOOST_NO_CXX11_SFINAE_EXPR
 #endif
 #if (_MSC_VER < 1915) || (_MSVC_LANG < 201402)
 // C++ 14:
 // Still gives internal compiler error for msvc-15.5:
 #  define BOOST_NO_CXX14_CONSTEXPR
 #endif
 // C++ 17:
 #if (_MSC_VER < 1912) || (_MSVC_LANG < 201703)
 #define BOOST_NO_CXX17_INLINE_VARIABLES
 #define BOOST_NO_CXX17_FOLD_EXPRESSIONS
 #endif

 //
 // Things that don't work in clr mode:
 //
 #ifdef _M_CEE
 #ifndef BOOST_NO_CXX11_THREAD_LOCAL
 #  define BOOST_NO_CXX11_THREAD_LOCAL
 #endif
 #ifndef BOOST_NO_SFINAE_EXPR
 #  define BOOST_NO_SFINAE_EXPR
 #endif
 #ifndef BOOST_NO_CXX11_REF_QUALIFIERS
 #  define BOOST_NO_CXX11_REF_QUALIFIERS
 #endif
 #endif
 #ifdef _M_CEE_PURE
 #ifndef BOOST_NO_CXX11_CONSTEXPR
 #  define BOOST_NO_CXX11_CONSTEXPR
 #endif
 #endif

 //
 // prefix and suffix headers:
 //
 #ifndef BOOST_ABI_PREFIX
 #  define BOOST_ABI_PREFIX "boost/config/abi/msvc_prefix.hpp"
 #endif
 #ifndef BOOST_ABI_SUFFIX
 #  define BOOST_ABI_SUFFIX "boost/config/abi/msvc_suffix.hpp"
 #endif

 #ifndef BOOST_COMPILER
 // TODO:
 // these things are mostly bogus. 1200 means version 12.0 of the compiler. The
 // artificial versions assigned to them only refer to the versions of some IDE
 // these compilers have been shipped with, and even that is not all of it. Some
 // were shipped with freely downloadable SDKs, others as crosscompilers in eVC.
 // IOW, you can't use these 'versions' in any sensible way. Sorry.
 # if defined(UNDER_CE)
 #   if _MSC_VER < 1400
       // Note: I'm not aware of any CE compiler with version 13xx
 #      if defined(BOOST_ASSERT_CONFIG)
 #         error "boost: Unknown EVC++ compiler version - please run the configure tests and report the results"
 #      else
 #         pragma message("boost: Unknown EVC++ compiler version - please run the configure tests and report the results")
 #      endif
 #   elif _MSC_VER < 1500
 #     define BOOST_COMPILER_VERSION evc8
 #   elif _MSC_VER < 1600
 #     define BOOST_COMPILER_VERSION evc9
 #   elif _MSC_VER < 1700
 #     define BOOST_COMPILER_VERSION evc10
 #   elif _MSC_VER < 1800
 #     define BOOST_COMPILER_VERSION evc11
 #   elif _MSC_VER < 1900
 #     define BOOST_COMPILER_VERSION evc12
 #   elif _MSC_VER < 2000
 #     define BOOST_COMPILER_VERSION evc14
 #   else
 #      if defined(BOOST_ASSERT_CONFIG)
 #         error "boost: Unknown EVC++ compiler version - please run the configure tests and report the results"
 #      else
 #         pragma message("boost: Unknown EVC++ compiler version - please run the configure tests and report the results")
 #      endif
 #   endif
 # else
 #   if _MSC_VER < 1200
       // Note: Versions up to 7.0 aren't supported.
 #     define BOOST_COMPILER_VERSION 5.0
 #   elif _MSC_VER < 1300
 #     define BOOST_COMPILER_VERSION 6.0
 #   elif _MSC_VER < 1310
 #     define BOOST_COMPILER_VERSION 7.0
 #   elif _MSC_VER < 1400
 #     define BOOST_COMPILER_VERSION 7.1
 #   elif _MSC_VER < 1500
 #     define BOOST_COMPILER_VERSION 8.0
 #   elif _MSC_VER < 1600
 #     define BOOST_COMPILER_VERSION 9.0
 #   elif _MSC_VER < 1700
 #     define BOOST_COMPILER_VERSION 10.0
 #   elif _MSC_VER < 1800
 #     define BOOST_COMPILER_VERSION 11.0
 #   elif _MSC_VER < 1900
 #     define BOOST_COMPILER_VERSION 12.0
 #   elif _MSC_VER < 1910
 #     define BOOST_COMPILER_VERSION 14.0
 #   elif _MSC_VER < 1920
 #     define BOOST_COMPILER_VERSION 14.1
 #   else
 #     define BOOST_COMPILER_VERSION _MSC_VER
 #   endif
 # endif

 #  define BOOST_COMPILER "Microsoft Visual C++ version " BOOST_STRINGIZE(BOOST_COMPILER_VERSION)
 #endif

 #include <boost/config/pragma_message.hpp>

 //
 // last known and checked version is 19.12.25830.2 (VC++ 2017.3):
 #if (_MSC_VER > 1912)
 #  if defined(BOOST_ASSERT_CONFIG)
 #     error "Boost.Config is older than your current compiler version."
 #  elif !defined(BOOST_CONFIG_SUPPRESS_OUTDATED_MESSAGE)
       //
       // Disabled as of March 2018 - the pace of VS releases is hard to keep up with
       // and in any case, we have relatively few defect macros defined now.
       // BOOST_PRAGMA_MESSAGE("Info: Boost.Config is older than your compiler version - probably nothing bad will happen - but you may wish to look for an updated Boost version. Define BOOST_CONFIG_SUPPRESS_OUTDATED_MESSAGE to suppress this message.")
 #  endif
 #endif
	// (C) Copyright John Maddock 2001 - 2003.
	// (C) Copyright Darin Adler 2001 - 2002.
	// (C) Copyright Peter Dimov 2001.
	// (C) Copyright Aleksey Gurtovoy 2002.
	// (C) Copyright David Abrahams 2002 - 2003.
	// (C) Copyright Beman Dawes 2002 - 2003.
	// Use, modification and distribution are subject to the
	// Boost Software License, Version 1.0. (See accompanying file
	// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

	// See http://www.boost.org for most recent version.
	//
	// Microsoft Visual C++ compiler setup:
	//
	// We need to be careful with the checks in this file, as contrary
	// to popular belief there are versions with _MSC_VER with the final
	// digit non-zero (mainly the MIPS cross compiler).
	//
	// So we either test _MSC_VER >= XXXX or else _MSC_VER < XXXX.
	// No other comparisons (==, >, or <=) are safe.
	//

	#define BOOST_MSVC _MSC_VER

	//
	// Helper macro BOOST_MSVC_FULL_VER for use in Boost code:
	//
	#if _MSC_FULL_VER > 100000000
	# define BOOST_MSVC_FULL_VER _MSC_FULL_VER
	#else
	# define BOOST_MSVC_FULL_VER (_MSC_FULL_VER * 10)
	#endif

	// Attempt to suppress VC6 warnings about the length of decorated names (obsolete):
	#pragma warning( disable : 4503 ) // warning: decorated name length exceeded

	#define BOOST_HAS_PRAGMA_ONCE

	//
	// versions check:
	// we don't support Visual C++ prior to version 7.1:
	#if _MSC_VER < 1310
	# error "Compiler not supported or configured - please reconfigure"
	#endif

	#if _MSC_FULL_VER < 180020827
	# define BOOST_NO_FENV_H
	#endif

	#if _MSC_VER < 1400
	// although a conforming signature for swprint exists in VC7.1
	// it appears not to actually work:
	# define BOOST_NO_SWPRINTF
	// Our extern template tests also fail for this compiler:
	# define BOOST_NO_CXX11_EXTERN_TEMPLATE
	// Variadic macros do not exist for VC7.1 and lower
	# define BOOST_NO_CXX11_VARIADIC_MACROS
	# define BOOST_NO_CXX11_LOCAL_CLASS_TEMPLATE_PARAMETERS
	#endif

	#if _MSC_VER < 1500 // 140X == VC++ 8.0
	# define BOOST_NO_MEMBER_TEMPLATE_FRIENDS
	#endif

	#if _MSC_VER < 1600 // 150X == VC++ 9.0
	// A bug in VC9:
	# define BOOST_NO_ADL_BARRIER
	#endif


	#ifndef _NATIVE_WCHAR_T_DEFINED
	# define BOOST_NO_INTRINSIC_WCHAR_T
	#endif

	//
	// check for exception handling support:
	#if !defined(_CPPUNWIND) && !defined(BOOST_NO_EXCEPTIONS)
	# define BOOST_NO_EXCEPTIONS
	#endif

	//
	// __int64 support:
	//
	#define BOOST_HAS_MS_INT64
	#if defined(_MSC_EXTENSIONS) \|\| (_MSC_VER >= 1400)
	# define BOOST_HAS_LONG_LONG
	#else
	# define BOOST_NO_LONG_LONG
	#endif
	#if (_MSC_VER >= 1400) && !defined(_DEBUG)
	# define BOOST_HAS_NRVO
	#endif
	#if _MSC_VER >= 1600 // 160X == VC++ 10.0
	# define BOOST_HAS_PRAGMA_DETECT_MISMATCH
	#endif
	//
	// disable Win32 API's if compiler extensions are
	// turned off:
	//
	#if !defined(_MSC_EXTENSIONS) && !defined(BOOST_DISABLE_WIN32)
	# define BOOST_DISABLE_WIN32
	#endif
	#if !defined(_CPPRTTI) && !defined(BOOST_NO_RTTI)
	# define BOOST_NO_RTTI
	#endif

	//
	// TR1 features:
	//
	#if (_MSC_VER >= 1700) && defined(_HAS_CXX17) && (_HAS_CXX17 > 0)
	// # define BOOST_HAS_TR1_HASH // don't know if this is true yet.
	// # define BOOST_HAS_TR1_TYPE_TRAITS // don't know if this is true yet.
	# define BOOST_HAS_TR1_UNORDERED_MAP
	# define BOOST_HAS_TR1_UNORDERED_SET
	#endif

	//
	// C++0x features
	//
	// See above for BOOST_NO_LONG_LONG

	// C++ features supported by VC++ 10 (aka 2010)
	//
	#if _MSC_VER < 1600
	# define BOOST_NO_CXX11_AUTO_DECLARATIONS
	# define BOOST_NO_CXX11_AUTO_MULTIDECLARATIONS
	# define BOOST_NO_CXX11_LAMBDAS
	# define BOOST_NO_CXX11_RVALUE_REFERENCES
	# define BOOST_NO_CXX11_STATIC_ASSERT
	# define BOOST_NO_CXX11_NULLPTR
	# define BOOST_NO_CXX11_DECLTYPE
	#endif // _MSC_VER < 1600

	#if _MSC_VER >= 1600
	# define BOOST_HAS_STDINT_H
	#endif

	// C++11 features supported by VC++ 11 (aka 2012)
	//
	#if _MSC_VER < 1700
	# define BOOST_NO_CXX11_FINAL
	# define BOOST_NO_CXX11_RANGE_BASED_FOR
	# define BOOST_NO_CXX11_SCOPED_ENUMS
	#endif // _MSC_VER < 1700

	// C++11 features supported by VC++ 12 (aka 2013).
	//
	#if _MSC_FULL_VER < 180020827
	# define BOOST_NO_CXX11_DEFAULTED_FUNCTIONS
	# define BOOST_NO_CXX11_DELETED_FUNCTIONS
	# define BOOST_NO_CXX11_EXPLICIT_CONVERSION_OPERATORS
	# define BOOST_NO_CXX11_FUNCTION_TEMPLATE_DEFAULT_ARGS
	# define BOOST_NO_CXX11_RAW_LITERALS
	# define BOOST_NO_CXX11_TEMPLATE_ALIASES
	# define BOOST_NO_CXX11_TRAILING_RESULT_TYPES
	# define BOOST_NO_CXX11_VARIADIC_TEMPLATES
	# define BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX
	# define BOOST_NO_CXX11_DECLTYPE_N3276
	#endif

	#if _MSC_FULL_VER >= 180020827
	#define BOOST_HAS_EXPM1
	#define BOOST_HAS_LOG1P
	#endif

	// C++11 features supported by VC++ 14 (aka 2015)
	//
	#if (_MSC_FULL_VER < 190023026)
	# define BOOST_NO_CXX11_NOEXCEPT
	# define BOOST_NO_CXX11_DEFAULTED_MOVES
	# define BOOST_NO_CXX11_REF_QUALIFIERS
	# define BOOST_NO_CXX11_USER_DEFINED_LITERALS
	# define BOOST_NO_CXX11_ALIGNAS
	# define BOOST_NO_CXX11_INLINE_NAMESPACES
	# define BOOST_NO_CXX11_CHAR16_T
	# define BOOST_NO_CXX11_CHAR32_T
	# define BOOST_NO_CXX11_UNICODE_LITERALS
	# define BOOST_NO_CXX14_DECLTYPE_AUTO
	# define BOOST_NO_CXX14_INITIALIZED_LAMBDA_CAPTURES
	# define BOOST_NO_CXX14_RETURN_TYPE_DEDUCTION
	# define BOOST_NO_CXX14_BINARY_LITERALS
	# define BOOST_NO_CXX14_GENERIC_LAMBDAS
	# define BOOST_NO_CXX14_DIGIT_SEPARATORS
	# define BOOST_NO_CXX11_THREAD_LOCAL
	#endif
	// C++11 features supported by VC++ 14 update 3 (aka 2015)
	//
	#if (_MSC_FULL_VER < 190024210)
	# define BOOST_NO_CXX14_VARIABLE_TEMPLATES
	# define BOOST_NO_SFINAE_EXPR
	# define BOOST_NO_CXX11_CONSTEXPR
	#endif

	// C++14 features supported by VC++ 14.1 (Visual Studio 2017)
	//
	#if (_MSC_VER < 1910)
	# define BOOST_NO_CXX14_AGGREGATE_NSDMI
	#endif

	// C++17 features supported by VC++ 14.1 (Visual Studio 2017) Update 3
	//
	#if (_MSC_VER < 1911) \|\| (_MSVC_LANG < 201703)
	# define BOOST_NO_CXX17_STRUCTURED_BINDINGS
	# define BOOST_NO_CXX17_IF_CONSTEXPR
	# define BOOST_NO_CXX17_HDR_OPTIONAL
	# define BOOST_NO_CXX17_HDR_STRING_VIEW
	#endif

	// MSVC including version 14 has not yet completely
	// implemented value-initialization, as is reported:
	// "VC++ does not value-initialize members of derived classes without
	// user-declared constructor", reported in 2009 by Sylvester Hesp:
	// https://connect.microsoft.com/VisualStudio/feedback/details/484295
	// "Presence of copy constructor breaks member class initialization",
	// reported in 2009 by Alex Vakulenko:
	// https://connect.microsoft.com/VisualStudio/feedback/details/499606
	// "Value-initialization in new-expression", reported in 2005 by
	// Pavel Kuznetsov (MetaCommunications Engineering):
	// https://connect.microsoft.com/VisualStudio/feedback/details/100744
	// Reported again by John Maddock in 2015 for VC14:
	// https://connect.microsoft.com/VisualStudio/feedback/details/1582233/c-subobjects-still-not-value-initialized-correctly
	// See also: http://www.boost.org/libs/utility/value_init.htm#compiler_issues
	// (Niels Dekker, LKEB, May 2010)
	// Still present in VC15.5, Dec 2017.
	#define BOOST_NO_COMPLETE_VALUE_INITIALIZATION
	//
	// C++ 11:
	//
	// This is supported with /permissive- for 15.5 onwards, unfortunately we appear to have no way to tell
	// if this is in effect or not, in any case nothing in Boost is currently using this, so we'll just go
	// on defining it for now:
	//
	# define BOOST_NO_TWO_PHASE_NAME_LOOKUP

	#if (_MSC_VER < 1912) \|\| (_MSVC_LANG < 201402)
	// Supported from msvc-15.5 onwards:
	#define BOOST_NO_CXX11_SFINAE_EXPR
	#endif
	#if (_MSC_VER < 1915) \|\| (_MSVC_LANG < 201402)
	// C++ 14:
	// Still gives internal compiler error for msvc-15.5:
	# define BOOST_NO_CXX14_CONSTEXPR
	#endif
	// C++ 17:
	#if (_MSC_VER < 1912) \|\| (_MSVC_LANG < 201703)
	#define BOOST_NO_CXX17_INLINE_VARIABLES
	#define BOOST_NO_CXX17_FOLD_EXPRESSIONS
	#endif

	//
	// Things that don't work in clr mode:
	//
	#ifdef _M_CEE
	#ifndef BOOST_NO_CXX11_THREAD_LOCAL
	# define BOOST_NO_CXX11_THREAD_LOCAL
	#endif
	#ifndef BOOST_NO_SFINAE_EXPR
	# define BOOST_NO_SFINAE_EXPR
	#endif
	#ifndef BOOST_NO_CXX11_REF_QUALIFIERS
	# define BOOST_NO_CXX11_REF_QUALIFIERS
	#endif
	#endif
	#ifdef _M_CEE_PURE
	#ifndef BOOST_NO_CXX11_CONSTEXPR
	# define BOOST_NO_CXX11_CONSTEXPR
	#endif
	#endif

	//
	// prefix and suffix headers:
	//
	#ifndef BOOST_ABI_PREFIX
	# define BOOST_ABI_PREFIX "boost/config/abi/msvc_prefix.hpp"
	#endif
	#ifndef BOOST_ABI_SUFFIX
	# define BOOST_ABI_SUFFIX "boost/config/abi/msvc_suffix.hpp"
	#endif

	#ifndef BOOST_COMPILER
	// TODO:
	// these things are mostly bogus. 1200 means version 12.0 of the compiler. The
	// artificial versions assigned to them only refer to the versions of some IDE
	// these compilers have been shipped with, and even that is not all of it. Some
	// were shipped with freely downloadable SDKs, others as crosscompilers in eVC.
	// IOW, you can't use these 'versions' in any sensible way. Sorry.
	# if defined(UNDER_CE)
	# if _MSC_VER < 1400
	// Note: I'm not aware of any CE compiler with version 13xx
	# if defined(BOOST_ASSERT_CONFIG)
	# error "boost: Unknown EVC++ compiler version - please run the configure tests and report the results"
	# else
	# pragma message("boost: Unknown EVC++ compiler version - please run the configure tests and report the results")
	# endif
	# elif _MSC_VER < 1500
	# define BOOST_COMPILER_VERSION evc8
	# elif _MSC_VER < 1600
	# define BOOST_COMPILER_VERSION evc9
	# elif _MSC_VER < 1700
	# define BOOST_COMPILER_VERSION evc10
	# elif _MSC_VER < 1800
	# define BOOST_COMPILER_VERSION evc11
	# elif _MSC_VER < 1900
	# define BOOST_COMPILER_VERSION evc12
	# elif _MSC_VER < 2000
	# define BOOST_COMPILER_VERSION evc14
	# else
	# if defined(BOOST_ASSERT_CONFIG)
	# error "boost: Unknown EVC++ compiler version - please run the configure tests and report the results"
	# else
	# pragma message("boost: Unknown EVC++ compiler version - please run the configure tests and report the results")
	# endif
	# endif
	# else
	# if _MSC_VER < 1200
	// Note: Versions up to 7.0 aren't supported.
	# define BOOST_COMPILER_VERSION 5.0
	# elif _MSC_VER < 1300
	# define BOOST_COMPILER_VERSION 6.0
	# elif _MSC_VER < 1310
	# define BOOST_COMPILER_VERSION 7.0
	# elif _MSC_VER < 1400
	# define BOOST_COMPILER_VERSION 7.1
	# elif _MSC_VER < 1500
	# define BOOST_COMPILER_VERSION 8.0
	# elif _MSC_VER < 1600
	# define BOOST_COMPILER_VERSION 9.0
	# elif _MSC_VER < 1700
	# define BOOST_COMPILER_VERSION 10.0
	# elif _MSC_VER < 1800
	# define BOOST_COMPILER_VERSION 11.0
	# elif _MSC_VER < 1900
	# define BOOST_COMPILER_VERSION 12.0
	# elif _MSC_VER < 1910
	# define BOOST_COMPILER_VERSION 14.0
	# elif _MSC_VER < 1920
	# define BOOST_COMPILER_VERSION 14.1
	# else
	# define BOOST_COMPILER_VERSION _MSC_VER
	# endif
	# endif

	# define BOOST_COMPILER "Microsoft Visual C++ version " BOOST_STRINGIZE(BOOST_COMPILER_VERSION)
	#endif

	#include <boost/config/pragma_message.hpp>

	//
	// last known and checked version is 19.12.25830.2 (VC++ 2017.3):
	#if (_MSC_VER > 1912)
	# if defined(BOOST_ASSERT_CONFIG)
	# error "Boost.Config is older than your current compiler version."
	# elif !defined(BOOST_CONFIG_SUPPRESS_OUTDATED_MESSAGE)
	//
	// Disabled as of March 2018 - the pace of VS releases is hard to keep up with
	// and in any case, we have relatively few defect macros defined now.
	// BOOST_PRAGMA_MESSAGE("Info: Boost.Config is older than your compiler version - probably nothing bad will happen - but you may wish to look for an updated Boost version. Define BOOST_CONFIG_SUPPRESS_OUTDATED_MESSAGE to suppress this message.")
	# endif
	#endif