5ccdaf643f
- Switch off `nodiscard` for clang unless C++17 is detected. - Detect C++ standard before the switch.
156 lines
6.9 KiB
C++
156 lines
6.9 KiB
C++
#pragma once
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#include <utility> // pair
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// This file contains all internal macro definitions
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// You MUST include macro_unscope.hpp at the end of json.hpp to undef all of them
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// exclude unsupported compilers
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#if !defined(JSON_SKIP_UNSUPPORTED_COMPILER_CHECK)
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#if defined(__clang__)
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#if (__clang_major__ * 10000 + __clang_minor__ * 100 + __clang_patchlevel__) < 30400
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#error "unsupported Clang version - see https://github.com/nlohmann/json#supported-compilers"
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#endif
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#elif defined(__GNUC__) && !(defined(__ICC) || defined(__INTEL_COMPILER))
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#if (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) < 40800
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#error "unsupported GCC version - see https://github.com/nlohmann/json#supported-compilers"
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#endif
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#endif
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#endif
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// C++ language standard detection
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#if (defined(__cplusplus) && __cplusplus >= 201703L) || (defined(_HAS_CXX17) && _HAS_CXX17 == 1) // fix for issue #464
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#define JSON_HAS_CPP_17
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#define JSON_HAS_CPP_14
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#elif (defined(__cplusplus) && __cplusplus >= 201402L) || (defined(_HAS_CXX14) && _HAS_CXX14 == 1)
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#define JSON_HAS_CPP_14
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#endif
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// disable float-equal warnings on GCC/clang
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#if defined(__clang__) || defined(__GNUC__) || defined(__GNUG__)
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wfloat-equal"
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#endif
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// disable documentation warnings on clang
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#if defined(__clang__)
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wdocumentation"
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#endif
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// allow for portable deprecation warnings
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#if defined(__clang__) || defined(__GNUC__) || defined(__GNUG__)
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#define JSON_DEPRECATED __attribute__((deprecated))
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#elif defined(_MSC_VER)
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#define JSON_DEPRECATED __declspec(deprecated)
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#else
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#define JSON_DEPRECATED
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#endif
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// allow for portable nodiscard warnings
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#if defined(__has_cpp_attribute)
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#if __has_cpp_attribute(nodiscard)
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#if defined(__clang__) && !defined(JSON_HAS_CPP_17) // issue #1535
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#define JSON_NODISCARD
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#else
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#define JSON_NODISCARD [[nodiscard]]
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#endif
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#elif __has_cpp_attribute(gnu::warn_unused_result)
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#define JSON_NODISCARD [[gnu::warn_unused_result]]
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#else
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#define JSON_NODISCARD
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#endif
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#else
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#define JSON_NODISCARD
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#endif
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// allow to disable exceptions
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#if (defined(__cpp_exceptions) || defined(__EXCEPTIONS) || defined(_CPPUNWIND)) && !defined(JSON_NOEXCEPTION)
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#define JSON_THROW(exception) throw exception
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#define JSON_TRY try
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#define JSON_CATCH(exception) catch(exception)
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#define JSON_INTERNAL_CATCH(exception) catch(exception)
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#else
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#include <cstdlib>
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#define JSON_THROW(exception) std::abort()
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#define JSON_TRY if(true)
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#define JSON_CATCH(exception) if(false)
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#define JSON_INTERNAL_CATCH(exception) if(false)
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#endif
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// override exception macros
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#if defined(JSON_THROW_USER)
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#undef JSON_THROW
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#define JSON_THROW JSON_THROW_USER
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#endif
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#if defined(JSON_TRY_USER)
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#undef JSON_TRY
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#define JSON_TRY JSON_TRY_USER
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#endif
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#if defined(JSON_CATCH_USER)
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#undef JSON_CATCH
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#define JSON_CATCH JSON_CATCH_USER
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#undef JSON_INTERNAL_CATCH
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#define JSON_INTERNAL_CATCH JSON_CATCH_USER
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#endif
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#if defined(JSON_INTERNAL_CATCH_USER)
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#undef JSON_INTERNAL_CATCH
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#define JSON_INTERNAL_CATCH JSON_INTERNAL_CATCH_USER
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#endif
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// manual branch prediction
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#if defined(__clang__) || defined(__GNUC__) || defined(__GNUG__)
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#define JSON_LIKELY(x) __builtin_expect(x, 1)
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#define JSON_UNLIKELY(x) __builtin_expect(x, 0)
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#else
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#define JSON_LIKELY(x) x
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#define JSON_UNLIKELY(x) x
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#endif
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/*!
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@brief macro to briefly define a mapping between an enum and JSON
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@def NLOHMANN_JSON_SERIALIZE_ENUM
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@since version 3.4.0
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*/
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#define NLOHMANN_JSON_SERIALIZE_ENUM(ENUM_TYPE, ...) \
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template<typename BasicJsonType> \
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inline void to_json(BasicJsonType& j, const ENUM_TYPE& e) \
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{ \
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static_assert(std::is_enum<ENUM_TYPE>::value, #ENUM_TYPE " must be an enum!"); \
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static const std::pair<ENUM_TYPE, BasicJsonType> m[] = __VA_ARGS__; \
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auto it = std::find_if(std::begin(m), std::end(m), \
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[e](const std::pair<ENUM_TYPE, BasicJsonType>& ej_pair) -> bool \
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{ \
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return ej_pair.first == e; \
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}); \
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j = ((it != std::end(m)) ? it : std::begin(m))->second; \
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} \
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template<typename BasicJsonType> \
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inline void from_json(const BasicJsonType& j, ENUM_TYPE& e) \
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{ \
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static_assert(std::is_enum<ENUM_TYPE>::value, #ENUM_TYPE " must be an enum!"); \
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static const std::pair<ENUM_TYPE, BasicJsonType> m[] = __VA_ARGS__; \
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auto it = std::find_if(std::begin(m), std::end(m), \
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[j](const std::pair<ENUM_TYPE, BasicJsonType>& ej_pair) -> bool \
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{ \
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return ej_pair.second == j; \
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}); \
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e = ((it != std::end(m)) ? it : std::begin(m))->first; \
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}
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// Ugly macros to avoid uglier copy-paste when specializing basic_json. They
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// may be removed in the future once the class is split.
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#define NLOHMANN_BASIC_JSON_TPL_DECLARATION \
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template<template<typename, typename, typename...> class ObjectType, \
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template<typename, typename...> class ArrayType, \
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class StringType, class BooleanType, class NumberIntegerType, \
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class NumberUnsignedType, class NumberFloatType, \
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template<typename> class AllocatorType, \
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template<typename, typename = void> class JSONSerializer>
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#define NLOHMANN_BASIC_JSON_TPL \
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basic_json<ObjectType, ArrayType, StringType, BooleanType, \
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NumberIntegerType, NumberUnsignedType, NumberFloatType, \
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AllocatorType, JSONSerializer>
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