mirror of
https://github.com/nlohmann/json.git
synced 2024-12-29 08:37:53 +08:00
ebd3f45808
For further details, read https://github.com/nlohmann/json/issues/1388 and https://blog.tartanllama.xyz/structured-bindings/
343 lines
11 KiB
C++
343 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 <nlohmann/detail/meta/cpp_future.hpp>
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#include <nlohmann/detail/meta/type_traits.hpp>
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#include <nlohmann/detail/value_t.hpp>
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#include <nlohmann/detail/iterators/iteration_proxy.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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template<typename BasicJsonType, typename CompatibleStringType,
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enable_if_t<not std::is_same<CompatibleStringType, typename BasicJsonType::string_t>::value,
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int> = 0>
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static void construct(BasicJsonType& j, const CompatibleStringType& str)
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{
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j.m_type = value_t::string;
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j.m_value.string = j.template create<typename BasicJsonType::string_t>(str);
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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,
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CompatibleArrayType>::value and
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not is_compatible_object_type<
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BasicJsonType, CompatibleArrayType>::value and
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not is_compatible_string_type<BasicJsonType, CompatibleArrayType>::value and
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not is_basic_json<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, const 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 and not is_basic_json<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 <
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typename BasicJsonType, typename T, std::size_t N,
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enable_if_t<not std::is_constructible<typename BasicJsonType::string_t,
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const T(&)[N]>::value,
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int> = 0 >
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void to_json(BasicJsonType& j, const 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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// for https://github.com/nlohmann/json/pull/1134
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template < typename BasicJsonType, typename T,
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enable_if_t<std::is_same<T, iteration_proxy_value<typename BasicJsonType::iterator>>::value, int> = 0>
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void to_json(BasicJsonType& j, const T& b)
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{
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j = { {b.key(), b.value()} };
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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...> /*unused*/)
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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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template<typename BasicJsonType, typename T>
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auto operator()(BasicJsonType& j, T&& val) 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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};
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} // namespace detail
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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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} // namespace
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} // namespace nlohmann
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