208 lines
6.8 KiB
C++
208 lines
6.8 KiB
C++
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//
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// Copyright (c) 2016-2019 Vinnie Falco (vinnie dot falco at gmail dot com)
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// Copyright (c) 2019-2020 Krystian Stasiowski (sdkrystian at gmail dot com)
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//
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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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// Official repository: https://github.com/boostorg/static_string
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//
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#ifndef BOOST_STATIC_STRING_CONFIG_HPP
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#define BOOST_STATIC_STRING_CONFIG_HPP
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// Are we dependent on Boost?
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// #define BOOST_STATIC_STRING_STANDALONE
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// Can we have deduction guides?
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#if __cpp_deduction_guides >= 201703L
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#define BOOST_STATIC_STRING_USE_DEDUCT
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#endif
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// Include <version> if we can
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#ifdef __has_include
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#if __has_include(<version>)
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#include <version>
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#endif
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#endif
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// Can we use __has_builtin?
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#ifdef __has_builtin
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#define BOOST_STATIC_STRING_HAS_BUILTIN(arg) __has_builtin(arg)
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#else
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#define BOOST_STATIC_STRING_HAS_BUILTIN(arg) 0
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#endif
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// Can we use is_constant_evaluated?
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#if __cpp_lib_is_constant_evaluated >= 201811L
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#define BOOST_STATIC_STRING_IS_CONST_EVAL std::is_constant_evaluated()
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#elif BOOST_STATIC_STRING_HAS_BUILTIN(__builtin_is_constant_evaluated)
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#define BOOST_STATIC_STRING_IS_CONST_EVAL __builtin_is_constant_evaluated()
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#endif
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// Check for an attribute
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#if defined(__has_cpp_attribute)
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#define BOOST_STATIC_STRING_CHECK_FOR_ATTR(x) __has_cpp_attribute(x)
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#elif defined(__has_attribute)
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#define BOOST_STATIC_STRING_CHECK_FOR_ATTR(x) __has_attribute(x)
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#else
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#define BOOST_STATIC_STRING_CHECK_FOR_ATTR(x) 0
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#endif
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// Decide which attributes we can use
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#define BOOST_STATIC_STRING_UNLIKELY
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#define BOOST_STATIC_STRING_NODISCARD
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#define BOOST_STATIC_STRING_NORETURN
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#define BOOST_STATIC_STRING_NO_NORETURN
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// unlikely
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#if BOOST_STATIC_STRING_CHECK_FOR_ATTR(unlikely)
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#undef BOOST_STATIC_STRING_UNLIKELY
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#define BOOST_STATIC_STRING_UNLIKELY [[unlikely]]
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#endif
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// nodiscard
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#if BOOST_STATIC_STRING_CHECK_FOR_ATTR(nodiscard)
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#undef BOOST_STATIC_STRING_NODISCARD
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#define BOOST_STATIC_STRING_NODISCARD [[nodiscard]]
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#elif defined(_MSC_VER) && _MSC_VER >= 1700
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#undef BOOST_STATIC_STRING_NODISCARD
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#define BOOST_STATIC_STRING_NODISCARD _Check_return_
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#elif defined(__GNUC__) || defined(__clang__)
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#undef BOOST_STATIC_STRING_NODISCARD
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#define BOOST_STATIC_STRING_NODISCARD __attribute__((warn_unused_result))
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#endif
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// noreturn
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#if BOOST_STATIC_STRING_CHECK_FOR_ATTR(noreturn)
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#undef BOOST_STATIC_STRING_NORETURN
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#undef BOOST_STATIC_STRING_NO_NORETURN
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#define BOOST_STATIC_STRING_NORETURN [[noreturn]]
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#elif defined(_MSC_VER)
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#undef BOOST_STATIC_STRING_NORETURN
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#undef BOOST_STATIC_STRING_NO_NORETURN
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#define BOOST_STATIC_STRING_NORETURN __declspec(noreturn)
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#elif defined(__GNUC__) || defined(__clang__)
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#undef BOOST_STATIC_STRING_NORETURN
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#undef BOOST_STATIC_STRING_NO_NORETURN
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#define BOOST_STATIC_STRING_NORETURN __attribute__((__noreturn__))
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#endif
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// _MSVC_LANG isn't avaliable until after VS2015
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#if defined(_MSC_VER) && _MSC_VER < 1910L
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// The constexpr support in this version is effectively that of
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// c++11, so we treat it as such
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#define BOOST_STATIC_STRING_STANDARD_VERSION 201103L
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#elif defined(_MSVC_LANG)
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// MSVC doesn't define __cplusplus by default
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#define BOOST_STATIC_STRING_STANDARD_VERSION _MSVC_LANG
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#else
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#define BOOST_STATIC_STRING_STANDARD_VERSION __cplusplus
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#endif
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// Decide what level of constexpr we can use
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#define BOOST_STATIC_STRING_CPP20_CONSTEXPR
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#define BOOST_STATIC_STRING_CPP17_CONSTEXPR
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#define BOOST_STATIC_STRING_CPP14_CONSTEXPR
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#define BOOST_STATIC_STRING_CPP11_CONSTEXPR
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#if BOOST_STATIC_STRING_STANDARD_VERSION >= 202002L
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#define BOOST_STATIC_STRING_CPP20
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#undef BOOST_STATIC_STRING_CPP20_CONSTEXPR
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#define BOOST_STATIC_STRING_CPP20_CONSTEXPR constexpr
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#endif
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#if BOOST_STATIC_STRING_STANDARD_VERSION >= 201703L
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#define BOOST_STATIC_STRING_CPP17
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#undef BOOST_STATIC_STRING_CPP17_CONSTEXPR
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#define BOOST_STATIC_STRING_CPP17_CONSTEXPR constexpr
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#endif
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#if BOOST_STATIC_STRING_STANDARD_VERSION >= 201402L
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#define BOOST_STATIC_STRING_CPP14
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#undef BOOST_STATIC_STRING_CPP14_CONSTEXPR
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#define BOOST_STATIC_STRING_CPP14_CONSTEXPR constexpr
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#endif
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#if BOOST_STATIC_STRING_STANDARD_VERSION >= 201103L
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#define BOOST_STATIC_STRING_CPP11
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#undef BOOST_STATIC_STRING_CPP11_CONSTEXPR
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#define BOOST_STATIC_STRING_CPP11_CONSTEXPR constexpr
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#endif
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// Boost and non-Boost versions of utilities
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#ifndef BOOST_STATIC_STRING_STANDALONE
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#ifndef BOOST_STATIC_STRING_THROW
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#define BOOST_STATIC_STRING_THROW(ex) BOOST_THROW_EXCEPTION(ex)
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#endif
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#ifndef BOOST_STATIC_STRING_STATIC_ASSERT
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#define BOOST_STATIC_STRING_STATIC_ASSERT(cond, msg) BOOST_STATIC_ASSERT_MSG(cond, msg)
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#endif
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#ifndef BOOST_STATIC_STRING_ASSERT
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#define BOOST_STATIC_STRING_ASSERT(cond) BOOST_ASSERT(cond)
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#endif
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#else
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#ifndef BOOST_STATIC_STRING_THROW
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#define BOOST_STATIC_STRING_THROW(ex) throw ex
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#endif
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#ifndef BOOST_STATIC_STRING_STATIC_ASSERT
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#define BOOST_STATIC_STRING_STATIC_ASSERT(cond, msg) static_assert(cond, msg)
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#endif
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#ifndef BOOST_STATIC_STRING_ASSERT
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#define BOOST_STATIC_STRING_ASSERT(cond) assert(cond)
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#endif
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#endif
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#ifndef BOOST_STATIC_STRING_STANDALONE
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#include <boost/assert.hpp>
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#include <boost/container_hash/hash.hpp>
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#include <boost/static_assert.hpp>
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#include <boost/utility/string_view.hpp>
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#include <boost/throw_exception.hpp>
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#else
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#include <cassert>
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#include <stdexcept>
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#include <string_view>
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#endif
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// Compiler bug prevents constexpr from working with clang 4.x and 5.x
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// if it is detected, we disable constexpr.
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#if (BOOST_STATIC_STRING_STANDARD_VERSION >= 201402L && \
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BOOST_STATIC_STRING_STANDARD_VERSION < 201703L) && \
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defined(__clang__) && \
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((__clang_major__ == 4) || (__clang_major__ == 5))
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// This directive works on clang
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#warning "C++14 constexpr is not supported in clang 4.x and 5.x due to a compiler bug."
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#ifdef BOOST_STATIC_STRING_CPP14
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#undef BOOST_STATIC_STRING_CPP14
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#endif
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#undef BOOST_STATIC_STRING_CPP14_CONSTEXPR
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#define BOOST_STATIC_STRING_CPP14_CONSTEXPR
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#endif
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// This is for compiler/library configurations
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// that cannot use the library comparison function
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// objects at all in constant expresssions. In these
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// cases, we use whatever will make more constexpr work.
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#if defined(__clang__) && \
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(defined(__GLIBCXX__) || defined(_MSC_VER))
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#define BOOST_STATIC_STRING_NO_PTR_COMP_FUNCTIONS
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#endif
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// In gcc-5, we cannot use throw expressions in a
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// constexpr function. However, we have a workaround
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// for this using constructors. Also, non-static member
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// functions that return the class they are a member of
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// causes an ICE during constant evaluation.
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#if defined(__GNUC__) && (__GNUC__== 5) && \
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defined(BOOST_STATIC_STRING_CPP14)
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#define BOOST_STATIC_STRING_GCC5_BAD_CONSTEXPR
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#endif
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namespace boost {
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namespace static_strings {
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/// The type of `basic_string_view` used by the library
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template<typename CharT, typename Traits>
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using basic_string_view =
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#ifndef BOOST_STATIC_STRING_STANDALONE
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boost::basic_string_view<CharT, Traits>;
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#else
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std::basic_string_view<CharT, Traits>;
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#endif
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} // static_strings
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} // boost
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#endif
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