mirror of
https://github.com/nlohmann/json.git
synced 2024-12-15 22:49:00 +08:00
339 lines
11 KiB
C++
339 lines
11 KiB
C++
#pragma once
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#include <ciso646> // or, and, not
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#include <iterator> // begin, end
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#include <tuple> // tuple, get
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#include <type_traits> // is_same, is_constructible, is_floating_point, is_enum, underlying_type
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#include <utility> // move, forward, declval, pair
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#include <valarray> // valarray
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#include <vector> // vector
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#include "detail/meta.hpp"
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#include "detail/value_t.hpp"
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namespace nlohmann
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{
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namespace detail
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{
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//////////////////
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// constructors //
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//////////////////
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template<value_t> struct external_constructor;
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template<>
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struct external_constructor<value_t::boolean>
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{
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template<typename BasicJsonType>
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static void construct(BasicJsonType& j, typename BasicJsonType::boolean_t b) noexcept
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{
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j.m_type = value_t::boolean;
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j.m_value = b;
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j.assert_invariant();
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}
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};
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template<>
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struct external_constructor<value_t::string>
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{
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template<typename BasicJsonType>
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static void construct(BasicJsonType& j, const typename BasicJsonType::string_t& s)
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{
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j.m_type = value_t::string;
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j.m_value = s;
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j.assert_invariant();
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}
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template<typename BasicJsonType>
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static void construct(BasicJsonType& j, typename BasicJsonType::string_t&& s)
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{
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j.m_type = value_t::string;
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j.m_value = std::move(s);
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j.assert_invariant();
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}
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};
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template<>
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struct external_constructor<value_t::number_float>
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{
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template<typename BasicJsonType>
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static void construct(BasicJsonType& j, typename BasicJsonType::number_float_t val) noexcept
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{
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j.m_type = value_t::number_float;
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j.m_value = val;
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j.assert_invariant();
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}
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};
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template<>
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struct external_constructor<value_t::number_unsigned>
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{
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template<typename BasicJsonType>
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static void construct(BasicJsonType& j, typename BasicJsonType::number_unsigned_t val) noexcept
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{
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j.m_type = value_t::number_unsigned;
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j.m_value = val;
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j.assert_invariant();
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}
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};
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template<>
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struct external_constructor<value_t::number_integer>
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{
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template<typename BasicJsonType>
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static void construct(BasicJsonType& j, typename BasicJsonType::number_integer_t val) noexcept
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{
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j.m_type = value_t::number_integer;
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j.m_value = val;
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j.assert_invariant();
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}
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};
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template<>
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struct external_constructor<value_t::array>
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{
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template<typename BasicJsonType>
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static void construct(BasicJsonType& j, const typename BasicJsonType::array_t& arr)
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{
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j.m_type = value_t::array;
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j.m_value = arr;
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j.assert_invariant();
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}
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template<typename BasicJsonType>
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static void construct(BasicJsonType& j, typename BasicJsonType::array_t&& arr)
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{
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j.m_type = value_t::array;
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j.m_value = std::move(arr);
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j.assert_invariant();
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}
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template<typename BasicJsonType, typename CompatibleArrayType,
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enable_if_t<not std::is_same<CompatibleArrayType, typename BasicJsonType::array_t>::value,
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int> = 0>
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static void construct(BasicJsonType& j, const CompatibleArrayType& arr)
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{
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using std::begin;
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using std::end;
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j.m_type = value_t::array;
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j.m_value.array = j.template create<typename BasicJsonType::array_t>(begin(arr), end(arr));
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j.assert_invariant();
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}
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template<typename BasicJsonType>
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static void construct(BasicJsonType& j, const std::vector<bool>& arr)
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{
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j.m_type = value_t::array;
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j.m_value = value_t::array;
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j.m_value.array->reserve(arr.size());
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for (const bool x : arr)
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{
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j.m_value.array->push_back(x);
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}
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j.assert_invariant();
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}
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template<typename BasicJsonType, typename T,
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enable_if_t<std::is_convertible<T, BasicJsonType>::value, int> = 0>
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static void construct(BasicJsonType& j, const std::valarray<T>& arr)
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{
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j.m_type = value_t::array;
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j.m_value = value_t::array;
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j.m_value.array->resize(arr.size());
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std::copy(std::begin(arr), std::end(arr), j.m_value.array->begin());
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j.assert_invariant();
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}
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};
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template<>
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struct external_constructor<value_t::object>
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{
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template<typename BasicJsonType>
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static void construct(BasicJsonType& j, const typename BasicJsonType::object_t& obj)
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{
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j.m_type = value_t::object;
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j.m_value = obj;
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j.assert_invariant();
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}
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template<typename BasicJsonType>
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static void construct(BasicJsonType& j, typename BasicJsonType::object_t&& obj)
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{
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j.m_type = value_t::object;
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j.m_value = std::move(obj);
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j.assert_invariant();
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}
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template<typename BasicJsonType, typename CompatibleObjectType,
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enable_if_t<not std::is_same<CompatibleObjectType, typename BasicJsonType::object_t>::value, int> = 0>
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static void construct(BasicJsonType& j, const CompatibleObjectType& obj)
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{
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using std::begin;
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using std::end;
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j.m_type = value_t::object;
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j.m_value.object = j.template create<typename BasicJsonType::object_t>(begin(obj), end(obj));
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j.assert_invariant();
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}
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};
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/////////////
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// to_json //
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/////////////
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template<typename BasicJsonType, typename T,
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enable_if_t<std::is_same<T, typename BasicJsonType::boolean_t>::value, int> = 0>
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void to_json(BasicJsonType& j, T b) noexcept
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{
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external_constructor<value_t::boolean>::construct(j, b);
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}
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template<typename BasicJsonType, typename CompatibleString,
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enable_if_t<std::is_constructible<typename BasicJsonType::string_t, CompatibleString>::value, int> = 0>
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void to_json(BasicJsonType& j, const CompatibleString& s)
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{
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external_constructor<value_t::string>::construct(j, s);
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}
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template<typename BasicJsonType>
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void to_json(BasicJsonType& j, typename BasicJsonType::string_t&& s)
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{
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external_constructor<value_t::string>::construct(j, std::move(s));
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}
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template<typename BasicJsonType, typename FloatType,
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enable_if_t<std::is_floating_point<FloatType>::value, int> = 0>
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void to_json(BasicJsonType& j, FloatType val) noexcept
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{
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external_constructor<value_t::number_float>::construct(j, static_cast<typename BasicJsonType::number_float_t>(val));
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}
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template<typename BasicJsonType, typename CompatibleNumberUnsignedType,
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enable_if_t<is_compatible_integer_type<typename BasicJsonType::number_unsigned_t, CompatibleNumberUnsignedType>::value, int> = 0>
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void to_json(BasicJsonType& j, CompatibleNumberUnsignedType val) noexcept
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{
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external_constructor<value_t::number_unsigned>::construct(j, static_cast<typename BasicJsonType::number_unsigned_t>(val));
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}
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template<typename BasicJsonType, typename CompatibleNumberIntegerType,
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enable_if_t<is_compatible_integer_type<typename BasicJsonType::number_integer_t, CompatibleNumberIntegerType>::value, int> = 0>
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void to_json(BasicJsonType& j, CompatibleNumberIntegerType val) noexcept
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{
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external_constructor<value_t::number_integer>::construct(j, static_cast<typename BasicJsonType::number_integer_t>(val));
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}
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template<typename BasicJsonType, typename EnumType,
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enable_if_t<std::is_enum<EnumType>::value, int> = 0>
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void to_json(BasicJsonType& j, EnumType e) noexcept
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{
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using underlying_type = typename std::underlying_type<EnumType>::type;
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external_constructor<value_t::number_integer>::construct(j, static_cast<underlying_type>(e));
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}
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template<typename BasicJsonType>
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void to_json(BasicJsonType& j, const std::vector<bool>& e)
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{
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external_constructor<value_t::array>::construct(j, e);
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}
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template<typename BasicJsonType, typename CompatibleArrayType,
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enable_if_t<is_compatible_array_type<BasicJsonType, CompatibleArrayType>::value or
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std::is_same<typename BasicJsonType::array_t, CompatibleArrayType>::value,
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int> = 0>
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void to_json(BasicJsonType& j, const CompatibleArrayType& arr)
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{
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external_constructor<value_t::array>::construct(j, arr);
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}
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template<typename BasicJsonType, typename T,
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enable_if_t<std::is_convertible<T, BasicJsonType>::value, int> = 0>
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void to_json(BasicJsonType& j, std::valarray<T> arr)
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{
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external_constructor<value_t::array>::construct(j, std::move(arr));
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}
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template<typename BasicJsonType>
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void to_json(BasicJsonType& j, typename BasicJsonType::array_t&& arr)
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{
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external_constructor<value_t::array>::construct(j, std::move(arr));
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}
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template<typename BasicJsonType, typename CompatibleObjectType,
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enable_if_t<is_compatible_object_type<BasicJsonType, CompatibleObjectType>::value, int> = 0>
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void to_json(BasicJsonType& j, const CompatibleObjectType& obj)
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{
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external_constructor<value_t::object>::construct(j, obj);
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}
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template<typename BasicJsonType>
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void to_json(BasicJsonType& j, typename BasicJsonType::object_t&& obj)
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{
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external_constructor<value_t::object>::construct(j, std::move(obj));
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}
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template<typename BasicJsonType, typename T, std::size_t N,
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enable_if_t<not std::is_constructible<typename BasicJsonType::string_t, T (&)[N]>::value, int> = 0>
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void to_json(BasicJsonType& j, T (&arr)[N])
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{
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external_constructor<value_t::array>::construct(j, arr);
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}
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template<typename BasicJsonType, typename... Args>
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void to_json(BasicJsonType& j, const std::pair<Args...>& p)
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{
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j = {p.first, p.second};
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}
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template<typename BasicJsonType, typename Tuple, std::size_t... Idx>
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void to_json_tuple_impl(BasicJsonType& j, const Tuple& t, index_sequence<Idx...>)
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{
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j = {std::get<Idx>(t)...};
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}
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template<typename BasicJsonType, typename... Args>
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void to_json(BasicJsonType& j, const std::tuple<Args...>& t)
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{
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to_json_tuple_impl(j, t, index_sequence_for<Args...> {});
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}
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struct to_json_fn
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{
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private:
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template<typename BasicJsonType, typename T>
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auto call(BasicJsonType& j, T&& val, priority_tag<1> /*unused*/) const noexcept(noexcept(to_json(j, std::forward<T>(val))))
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-> decltype(to_json(j, std::forward<T>(val)), void())
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{
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return to_json(j, std::forward<T>(val));
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}
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template<typename BasicJsonType, typename T>
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void call(BasicJsonType& /*unused*/, T&& /*unused*/, priority_tag<0> /*unused*/) const noexcept
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{
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static_assert(sizeof(BasicJsonType) == 0,
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"could not find to_json() method in T's namespace");
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#ifdef _MSC_VER
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// MSVC does not show a stacktrace for the above assert
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using decayed = uncvref_t<T>;
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static_assert(sizeof(typename decayed::force_msvc_stacktrace) == 0,
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"forcing MSVC stacktrace to show which T we're talking about.");
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#endif
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}
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public:
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template<typename BasicJsonType, typename T>
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void operator()(BasicJsonType& j, T&& val) const
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noexcept(noexcept(std::declval<to_json_fn>().call(j, std::forward<T>(val), priority_tag<1> {})))
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{
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return call(j, std::forward<T>(val), priority_tag<1> {});
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}
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};
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}
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/// namespace to hold default `to_json` function
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namespace
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{
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constexpr const auto& to_json = detail::static_const<detail::to_json_fn>::value;
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}
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}
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