mirror of
https://github.com/nlohmann/json.git
synced 2024-12-13 04:36:45 +08:00
126 lines
5.0 KiB
C++
126 lines
5.0 KiB
C++
#pragma once
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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__) < 40900
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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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// 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 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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#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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// 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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// 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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/*!
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@brief Helper to determine whether there's a key_type for T.
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This helper is used to tell associative containers apart from other containers
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such as sequence containers. For instance, `std::map` passes the test as it
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contains a `mapped_type`, whereas `std::vector` fails the test.
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@sa http://stackoverflow.com/a/7728728/266378
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@since version 1.0.0, overworked in version 2.0.6
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*/
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#define NLOHMANN_JSON_HAS_HELPER(type) \
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template<typename T> struct has_##type { \
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private: \
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template<typename U, typename = typename U::type> \
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static int detect(U &&); \
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static void detect(...); \
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public: \
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static constexpr bool value = \
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std::is_integral<decltype(detect(std::declval<T>()))>::value; \
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}
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