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Add support for deserialization of STL containers of non-default constructable types (fixes #2574).

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This commit is contained in:
Anthony VH
2021-01-09 00:08:27 +01:00
parent 01f6b2e741
commit 1e825e4f92
6 changed files with 312 additions and 39 deletions
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27
include/nlohmann/adl_serializer.hpp
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@ -1,14 +1,16 @@
#pragma once
#include <type_traits>
#include <utility>
#include <nlohmann/detail/conversions/from_json.hpp>
#include <nlohmann/detail/conversions/to_json.hpp>
#include <nlohmann/detail/meta/type_traits.hpp>
namespace nlohmann
{
template<typename, typename>
template<typename ValueType, typename>
struct adl_serializer
{
/*!
@ -20,14 +22,22 @@ struct adl_serializer
@param[in] j JSON value to read from
@param[in,out] val value to write to
*/
template<typename BasicJsonType, typename ValueType>
static auto from_json(BasicJsonType&& j, ValueType& val) noexcept(
template<typename BasicJsonType, typename U = ValueType>
static auto from_json(BasicJsonType && j, U& val) noexcept(
noexcept(::nlohmann::from_json(std::forward<BasicJsonType>(j), val)))
-> decltype(::nlohmann::from_json(std::forward<BasicJsonType>(j), val), void())
{
::nlohmann::from_json(std::forward<BasicJsonType>(j), val);
}
template<typename BasicJsonType, typename U = ValueType>
static auto from_json(BasicJsonType && j) noexcept(
noexcept(::nlohmann::from_json(std::forward<BasicJsonType>(j), detail::tag<U> {})))
-> decltype(::nlohmann::from_json(std::forward<BasicJsonType>(j), detail::tag<U> {}))
{
return ::nlohmann::from_json(std::forward<BasicJsonType>(j), detail::tag<U> {});
}
/*!
@brief convert any value type to a JSON value
@ -37,13 +47,12 @@ struct adl_serializer
@param[in,out] j JSON value to write to
@param[in] val value to read from
*/
template<typename BasicJsonType, typename ValueType>
static auto to_json(BasicJsonType& j, ValueType&& val) noexcept(
noexcept(::nlohmann::to_json(j, std::forward<ValueType>(val))))
-> decltype(::nlohmann::to_json(j, std::forward<ValueType>(val)), void())
template<typename BasicJsonType, typename U = ValueType>
static auto to_json(BasicJsonType& j, U && val) noexcept(
noexcept(::nlohmann::to_json(j, std::forward<U>(val))))
-> decltype(::nlohmann::to_json(j, std::forward<U>(val)), void())
{
::nlohmann::to_json(j, std::forward<ValueType>(val));
::nlohmann::to_json(j, std::forward<U>(val));
}
};
} // namespace nlohmann