325 lines
9.0 KiB
C++
325 lines
9.0 KiB
C++
//
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// Copyright (c) 2019 Vinnie Falco (vinnie.falco@gmail.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/json
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//
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#ifndef BOOST_JSON_DETAIL_CONFIG_HPP
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#define BOOST_JSON_DETAIL_CONFIG_HPP
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#include <boost/config.hpp>
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#include <boost/assert.hpp>
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#include <boost/throw_exception.hpp>
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#include <cstdint>
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#include <type_traits>
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#include <utility>
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// detect 32/64 bit
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#if UINTPTR_MAX == UINT64_MAX
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# define BOOST_JSON_ARCH 64
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#elif UINTPTR_MAX == UINT32_MAX
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# define BOOST_JSON_ARCH 32
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#else
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# error Unknown or unsupported architecture, please open an issue
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#endif
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// VFALCO Copied from Boost.Config
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// This is a derivative work.
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#ifndef BOOST_JSON_NODISCARD
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# ifdef __has_cpp_attribute
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// clang-6 accepts [[nodiscard]] with -std=c++14, but warns about it -pedantic
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# if __has_cpp_attribute(nodiscard) && !(defined(__clang__) && (__cplusplus < 201703L))
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# define BOOST_JSON_NODISCARD [[nodiscard]]
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# else
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# define BOOST_JSON_NODISCARD
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# endif
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# else
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# define BOOST_JSON_NODISCARD
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# endif
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#endif
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#ifndef BOOST_JSON_REQUIRE_CONST_INIT
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# define BOOST_JSON_REQUIRE_CONST_INIT
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# if __cpp_constinit >= 201907L
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# undef BOOST_JSON_REQUIRE_CONST_INIT
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# define BOOST_JSON_REQUIRE_CONST_INIT constinit
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# elif defined(__clang__) && defined(__has_cpp_attribute)
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# if __has_cpp_attribute(clang::require_constant_initialization)
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# undef BOOST_JSON_REQUIRE_CONST_INIT
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# define BOOST_JSON_REQUIRE_CONST_INIT [[clang::require_constant_initialization]]
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# endif
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# endif
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#endif
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#ifndef BOOST_JSON_NO_DESTROY
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# if defined(__clang__) && defined(__has_cpp_attribute)
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# if __has_cpp_attribute(clang::no_destroy)
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# define BOOST_JSON_NO_DESTROY [[clang::no_destroy]]
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# endif
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# endif
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#endif
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// BOOST_NORETURN ---------------------------------------------//
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// Macro to use before a function declaration/definition to designate
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// the function as not returning normally (i.e. with a return statement
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// or by leaving the function scope, if the function return type is void).
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#if !defined(BOOST_NORETURN)
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# if defined(_MSC_VER)
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# define BOOST_NORETURN __declspec(noreturn)
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# elif defined(__GNUC__)
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# define BOOST_NORETURN __attribute__ ((__noreturn__))
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# elif defined(__has_attribute) && defined(__SUNPRO_CC) && (__SUNPRO_CC > 0x5130)
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# if __has_attribute(noreturn)
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# define BOOST_NORETURN [[noreturn]]
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# endif
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# elif defined(__has_cpp_attribute)
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# if __has_cpp_attribute(noreturn)
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# define BOOST_NORETURN [[noreturn]]
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# endif
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# endif
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#endif
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#ifndef BOOST_ASSERT
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#define BOOST_ASSERT assert
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#endif
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#ifndef BOOST_STATIC_ASSERT
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#define BOOST_STATIC_ASSERT( ... ) static_assert(__VA_ARGS__, #__VA_ARGS__)
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#endif
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#ifndef BOOST_FALLTHROUGH
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#define BOOST_FALLTHROUGH [[fallthrough]]
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#endif
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#ifndef BOOST_FORCEINLINE
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# ifdef _MSC_VER
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# define BOOST_FORCEINLINE __forceinline
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# elif defined(__GNUC__) || defined(__clang__)
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# define BOOST_FORCEINLINE inline __attribute__((always_inline))
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# else
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# define BOOST_FORCEINLINE inline
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# endif
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#endif
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#ifndef BOOST_NOINLINE
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# ifdef _MSC_VER
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# define BOOST_NOINLINE __declspec(noinline)
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# elif defined(__GNUC__) || defined(__clang__)
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# define BOOST_NOINLINE __attribute__((noinline))
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# else
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# define BOOST_NOINLINE
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# endif
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#endif
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#ifndef BOOST_THROW_EXCEPTION
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# ifndef BOOST_NO_EXCEPTIONS
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# define BOOST_THROW_EXCEPTION(x) throw(x)
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# else
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# define BOOST_THROW_EXCEPTION(x) do{}while(0)
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# endif
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#endif
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#if ! defined(BOOST_JSON_NO_SSE2) && \
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! defined(BOOST_JSON_USE_SSE2)
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# if (defined(_M_IX86) && _M_IX86_FP == 2) || \
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defined(_M_X64) || defined(__SSE2__)
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# define BOOST_JSON_USE_SSE2
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# endif
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#endif
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#ifndef BOOST_SYMBOL_VISIBLE
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#define BOOST_SYMBOL_VISIBLE
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#endif
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#if ! defined(BOOST_JSON_DOCS)
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# define BOOST_JSON_NS_BEGIN \
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namespace boost { \
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namespace json {
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# define BOOST_JSON_NS_END } }
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#endif
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#if defined(BOOST_JSON_DOCS)
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# define BOOST_JSON_DECL
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#else
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# if (defined(BOOST_JSON_DYN_LINK) || defined(BOOST_ALL_DYN_LINK)) && !defined(BOOST_JSON_STATIC_LINK)
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# if defined(BOOST_JSON_SOURCE)
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# define BOOST_JSON_DECL BOOST_SYMBOL_EXPORT
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# define BOOST_JSON_CLASS_DECL BOOST_SYMBOL_EXPORT
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# define BOOST_JSON_BUILD_DLL
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# else
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# define BOOST_JSON_DECL BOOST_SYMBOL_IMPORT
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# define BOOST_JSON_CLASS_DECL BOOST_SYMBOL_IMPORT
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# endif
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# endif // shared lib
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# ifndef BOOST_JSON_DECL
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# define BOOST_JSON_DECL
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# endif
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# if !defined(BOOST_JSON_SOURCE) && !defined(BOOST_ALL_NO_LIB) && !defined(BOOST_JSON_NO_LIB)
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# define BOOST_LIB_NAME boost_json
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# if defined(BOOST_ALL_DYN_LINK) || defined(BOOST_JSON_DYN_LINK)
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# define BOOST_DYN_LINK
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# endif
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# include <boost/config/auto_link.hpp>
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# endif
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#endif
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#ifndef BOOST_JSON_DECL
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#define BOOST_JSON_DECL
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#endif
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#ifndef BOOST_JSON_CLASS_DECL
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#define BOOST_JSON_CLASS_DECL
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#endif
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#ifndef BOOST_JSON_LIKELY
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# if defined(__GNUC__) || defined(__clang__)
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# define BOOST_JSON_LIKELY(x) __builtin_expect(!!(x), 1)
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# else
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# define BOOST_JSON_LIKELY(x) x
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# endif
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#endif
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#ifndef BOOST_JSON_UNLIKELY
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# if defined(__GNUC__) || defined(__clang__)
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# define BOOST_JSON_UNLIKELY(x) __builtin_expect(!!(x), 0)
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# else
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# define BOOST_JSON_UNLIKELY(x) x
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# endif
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#endif
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#ifndef BOOST_JSON_UNREACHABLE
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# define BOOST_JSON_UNREACHABLE() static_cast<void>(0)
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# ifdef _MSC_VER
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# undef BOOST_JSON_UNREACHABLE
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# define BOOST_JSON_UNREACHABLE() __assume(0)
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# elif defined(__has_builtin)
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# if __has_builtin(__builtin_unreachable)
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# undef BOOST_JSON_UNREACHABLE
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# define BOOST_JSON_UNREACHABLE() __builtin_unreachable()
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# endif
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# endif
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#endif
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#ifndef BOOST_JSON_ASSUME
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# define BOOST_JSON_ASSUME(x) (!!(x) ? void() : BOOST_JSON_UNREACHABLE())
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# ifdef _MSC_VER
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# undef BOOST_JSON_ASSUME
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# define BOOST_JSON_ASSUME(x) __assume(!!(x))
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# elif defined(__has_builtin)
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# if __has_builtin(__builtin_assume)
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# undef BOOST_JSON_ASSUME
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# define BOOST_JSON_ASSUME(x) __builtin_assume(!!(x))
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# endif
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# endif
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#endif
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// older versions of msvc and clang don't always
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// constant initialize when they are supposed to
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#ifndef BOOST_JSON_WEAK_CONSTINIT
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# if defined(_MSC_VER) && ! defined(__clang__) && _MSC_VER < 1920
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# define BOOST_JSON_WEAK_CONSTINIT
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# elif defined(__clang__) && __clang_major__ < 4
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# define BOOST_JSON_WEAK_CONSTINIT
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# endif
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#endif
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// These macros are private, for tests, do not change
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// them or else previously built libraries won't match.
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#ifndef BOOST_JSON_MAX_STRING_SIZE
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# define BOOST_JSON_NO_MAX_STRING_SIZE
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# define BOOST_JSON_MAX_STRING_SIZE 0x7ffffffe
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#endif
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#ifndef BOOST_JSON_MAX_STRUCTURED_SIZE
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# define BOOST_JSON_NO_MAX_STRUCTURED_SIZE
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# define BOOST_JSON_MAX_STRUCTURED_SIZE 0x7ffffffe
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#endif
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#ifndef BOOST_JSON_STACK_BUFFER_SIZE
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# define BOOST_JSON_NO_STACK_BUFFER_SIZE
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# if defined(__i386__) || defined(__x86_64__) || \
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defined(_M_IX86) || defined(_M_X64)
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# define BOOST_JSON_STACK_BUFFER_SIZE 4096
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# else
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// If we are not on Intel, then assume we are on
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// embedded and use a smaller stack size. If this
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// is not suitable, the user can define the macro
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// themselves when building the library or including
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// src.hpp.
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# define BOOST_JSON_STACK_BUFFER_SIZE 256
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# endif
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#endif
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#if ! defined(BOOST_JSON_BIG_ENDIAN) && ! defined(BOOST_JSON_LITTLE_ENDIAN)
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// Copied from Boost.Endian
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# if defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__) && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
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# define BOOST_JSON_LITTLE_ENDIAN
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# elif defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__) && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
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# define BOOST_JSON_BIG_ENDIAN
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# elif defined(__LITTLE_ENDIAN__)
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# define BOOST_JSON_LITTLE_ENDIAN
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# elif defined(__BIG_ENDIAN__)
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# define BOOST_JSON_BIG_ENDIAN
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# elif defined(_MSC_VER) || defined(__i386__) || defined(__x86_64__)
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# define BOOST_JSON_LITTLE_ENDIAN
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# else
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# error The Boost.JSON library could not determine the endianness of this platform. Define either BOOST_JSON_BIG_ENDIAN or BOOST_JSON_LITTLE_ENDIAN.
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# endif
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#endif
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BOOST_JSON_NS_BEGIN
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namespace detail {
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template<class...>
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struct make_void
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{
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using type =void;
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};
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template<class... Ts>
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using void_t = typename
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make_void<Ts...>::type;
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template<class T>
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using remove_cvref = typename
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std::remove_cv<typename
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std::remove_reference<T>::type>::type;
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template<class T, class U>
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T exchange(T& t, U u) noexcept
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{
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T v = std::move(t);
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t = std::move(u);
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return v;
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}
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/* This is a derivative work, original copyright:
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Copyright Eric Niebler 2013-present
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Use, modification and distribution is subject to the
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Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at
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http://www.boost.org/LICENSE_1_0.txt)
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Project home: https://github.com/ericniebler/range-v3
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*/
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template<typename T>
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struct static_const
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{
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static constexpr T value {};
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};
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template<typename T>
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constexpr T static_const<T>::value;
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#define BOOST_JSON_INLINE_VARIABLE(name, type) \
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namespace { constexpr auto& name = \
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::boost::json::detail::static_const<type>::value; \
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} struct _unused_ ## name ## _semicolon_bait_
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} // detail
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BOOST_JSON_NS_END
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#endif
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