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157 lines
4.3 KiB
C++
157 lines
4.3 KiB
C++
/*=============================================================================
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Copyright (c) 2016 Paul Fultz II
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config.hpp
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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==============================================================================*/
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#ifndef FIT_GUARD_CONFIG_HPP
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#define FIT_GUARD_CONFIG_HPP
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// Check for std version
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#if __cplusplus >= 201402
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#define FIT_HAS_STD_14 1
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#else
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#define FIT_HAS_STD_14 0
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#endif
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#if __cplusplus >= 201103
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#define FIT_HAS_STD_11 1
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#else
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#define FIT_HAS_STD_11 0
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#endif
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// This determines if it safe to use inheritance for EBO. On every platform
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// except clang, compilers have problems with ambigous base conversion. So
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// this configures the library to use a different technique to achieve empty
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// optimization.
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#ifndef FIT_HAS_EBO
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#ifdef __clang__
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#define FIT_HAS_EBO 1
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#else
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#define FIT_HAS_EBO 0
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#endif
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#endif
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// This configures the library whether expression sfinae can be used to detect
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// callability of a function.
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#ifndef FIT_NO_EXPRESSION_SFINAE
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#ifdef _MSC_VER
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#define FIT_NO_EXPRESSION_SFINAE 1
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#else
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#define FIT_NO_EXPRESSION_SFINAE 0
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#endif
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#endif
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// This configures the library to use manual type deduction in a few places
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// where it problematic on a few platforms.
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#ifndef FIT_HAS_MANUAL_DEDUCTION
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#if (defined(__GNUC__) && !defined (__clang__) && __GNUC__ == 4 && __GNUC_MINOR__ < 8)
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#define FIT_HAS_MANUAL_DEDUCTION 1
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#else
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#define FIT_HAS_MANUAL_DEDUCTION 0
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#endif
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#endif
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// Whether the compiler has relaxed constexpr.
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#ifndef FIT_HAS_RELAXED_CONSTEXPR
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#ifdef __cpp_constexpr
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#if __cpp_constexpr >= 201304
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#define FIT_HAS_RELAXED_CONSTEXPR 1
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#else
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#define FIT_HAS_RELAXED_CONSTEXPR 0
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#endif
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#else
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#define FIT_HAS_RELAXED_CONSTEXPR FIT_HAS_STD_14
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#endif
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#endif
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// Whether the compiler supports generic lambdas
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#ifndef FIT_HAS_GENERIC_LAMBDA
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#if defined(__cpp_generic_lambdas) || defined(_MSC_VER)
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#define FIT_HAS_GENERIC_LAMBDA 1
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#else
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#define FIT_HAS_GENERIC_LAMBDA FIT_HAS_STD_14
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#endif
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#endif
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// Whether the compiler supports variable templates
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#ifndef FIT_HAS_VARIABLE_TEMPLATES
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#if defined(__clang__) && __clang_major__ == 3 && __clang_minor__ < 5
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#define FIT_HAS_VARIABLE_TEMPLATES 0
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#elif defined(__cpp_variable_templates)
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#define FIT_HAS_VARIABLE_TEMPLATES 1
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#else
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#define FIT_HAS_VARIABLE_TEMPLATES FIT_HAS_STD_14
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#endif
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#endif
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// Whether a constexpr function can use a void return type
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#ifndef FIT_NO_CONSTEXPR_VOID
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#if FIT_HAS_RELAXED_CONSTEXPR
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#define FIT_NO_CONSTEXPR_VOID 0
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#else
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#define FIT_NO_CONSTEXPR_VOID 1
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#endif
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#endif
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// Whether to use template aliases
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#ifndef FIT_HAS_TEMPLATE_ALIAS
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#if defined(__GNUC__) && !defined (__clang__) && __GNUC__ == 4 && __GNUC_MINOR__ < 8
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#define FIT_HAS_TEMPLATE_ALIAS 0
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#else
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#define FIT_HAS_TEMPLATE_ALIAS 1
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#endif
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#endif
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// Whether evaluations of function in brace initialization is ordered from
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// left-to-right.
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#ifndef FIT_NO_ORDERED_BRACE_INIT
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#if (defined(__GNUC__) && !defined (__clang__) && __GNUC__ == 4 && __GNUC_MINOR__ < 9) || defined(_MSC_VER)
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#define FIT_NO_ORDERED_BRACE_INIT 1
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#else
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#define FIT_NO_ORDERED_BRACE_INIT 0
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#endif
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#endif
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// Whether the compiler has trouble mangling some expressions used in
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// decltype.
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#ifndef FIT_HAS_MANGLE_OVERLOAD
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#if defined(__GNUC__) && !defined (__clang__) && __GNUC__ == 4 && __GNUC_MINOR__ < 7
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#define FIT_HAS_MANGLE_OVERLOAD 0
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#else
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#define FIT_HAS_MANGLE_OVERLOAD 1
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#endif
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#endif
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// Whether an incomplete 'this' pointer can be used in a trailing decltype.
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#ifndef FIT_HAS_COMPLETE_DECLTYPE
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#if !FIT_HAS_MANGLE_OVERLOAD || (defined(__GNUC__) && !defined (__clang__) && __GNUC__ == 4 && __GNUC_MINOR__ < 8)
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#define FIT_HAS_COMPLETE_DECLTYPE 0
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#else
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#define FIT_HAS_COMPLETE_DECLTYPE 1
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#endif
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#endif
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// Some type expansion failures on gcc 4.6
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#ifndef FIT_NO_TYPE_PACK_EXPANSION_IN_TEMPLATE
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#if defined(__GNUC__) && !defined (__clang__) && __GNUC__ == 4 && __GNUC_MINOR__ < 7
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#define FIT_NO_TYPE_PACK_EXPANSION_IN_TEMPLATE 1
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#else
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#define FIT_NO_TYPE_PACK_EXPANSION_IN_TEMPLATE 0
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#endif
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#endif
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// Whether to use std::default_constructible, it is a little buggy on gcc 4.6.
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#ifndef FIT_NO_STD_DEFAULT_CONSTRUCTIBLE
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#if defined(__GNUC__) && !defined (__clang__) && __GNUC__ == 4 && __GNUC_MINOR__ < 7
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#define FIT_NO_STD_DEFAULT_CONSTRUCTIBLE 1
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#else
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#define FIT_NO_STD_DEFAULT_CONSTRUCTIBLE 0
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#endif
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#endif
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#endif
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