mirror/json
1
0
Fork 0
mirror of https://github.com/nlohmann/json.git synced 2025-01-19 15:53:00 +08:00
Code Issues Actions 7 Packages Projects Releases Wiki Activity

Simplify from_json overloads.

Browse Source
This commit is contained in:
Anthony VH 2021-01-12 18:28:29 +01:00
parent 6ebf274ca0
commit 6278f31d23
1 changed files with 24 additions and 41 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

65
include/nlohmann/detail/conversions/from_json.hpp
View File

@ -249,23 +249,16 @@ void())
from_json_array_impl(j, arr, priority_tag<3> {});
}
template < typename T, typename BasicJsonType, typename ArrayType, std::size_t... Idx>
ArrayType from_json_inplace_array_impl_base(BasicJsonType&& j, identity_tag<ArrayType> /*unused*/,
index_sequence<Idx...> /*unused*/)
template < typename BasicJsonType, typename T, std::size_t... Idx >
std::array<T, sizeof...(Idx)> from_json_inplace_array_impl(BasicJsonType&& j,
identity_tag<std::array<T, sizeof...(Idx)>> /*unused*/, index_sequence<Idx...> /*unused*/)
{
return { std::forward<BasicJsonType>(j).at(Idx).template get<T>()... };
}
template < typename BasicJsonType, typename T, std::size_t N >
auto from_json_inplace_array_impl(BasicJsonType&& j, identity_tag<std::array<T, N>> tag, priority_tag<0> /*unused*/)
-> decltype(from_json_inplace_array_impl_base<T>(std::forward<BasicJsonType>(j), tag, make_index_sequence<N> {}))
{
return from_json_inplace_array_impl_base<T>(std::forward<BasicJsonType>(j), tag, make_index_sequence<N> {});
}
template < typename BasicJsonType, typename ArrayType >
auto from_json(BasicJsonType&& j, identity_tag<ArrayType> tag)
-> decltype(from_json_inplace_array_impl(std::forward<BasicJsonType>(j), tag, priority_tag<0> {}))
auto from_json(BasicJsonType&& j, identity_tag<std::array<T, N>> tag)
-> decltype(from_json_inplace_array_impl(std::forward<BasicJsonType>(j), tag, make_index_sequence<N> {}))
{
if (JSON_HEDLEY_UNLIKELY(!j.is_array()))
{
@ -273,7 +266,7 @@ auto from_json(BasicJsonType&& j, identity_tag<ArrayType> tag)
std::string(j.type_name())));
}
return from_json_inplace_array_impl(std::forward<BasicJsonType>(j), tag, priority_tag<0> {});
return from_json_inplace_array_impl(std::forward<BasicJsonType>(j), tag, make_index_sequence<N> {});
}
template<typename BasicJsonType>
@ -358,9 +351,8 @@ std::pair<A1, A2> from_json_pair_impl(BasicJsonType&& j, identity_tag<std::pair<
std::forward<BasicJsonType>(j).at(1).template get<A2>()};
}
template<typename BasicJsonType, typename A1, typename A2,
enable_if_t<std::is_default_constructible<std::pair<A1, A2>>::value, int> = 0>
void from_json_pair_impl(BasicJsonType && j, std::pair<A1, A2>& p, priority_tag<1> /*unused*/)
template<typename BasicJsonType, typename A1, typename A2>
void from_json_pair_impl(BasicJsonType&& j, std::pair<A1, A2>& p, priority_tag<1> /*unused*/)
{
p = from_json_pair_impl(std::forward<BasicJsonType>(j), identity_tag<std::pair<A1, A2>> {}, priority_tag<0> {});
}
@ -378,22 +370,27 @@ auto from_json(BasicJsonType&& j, PairRelatedType&& p)
return from_json_pair_impl(std::forward<BasicJsonType>(j), std::forward<PairRelatedType>(p), priority_tag<1> {});
}
template<typename BasicJsonType, typename Tuple, std::size_t... Idx>
Tuple from_json_tuple_impl(BasicJsonType&& j, identity_tag<Tuple> /*unused*/, index_sequence<Idx...> /*unused*/, priority_tag<0> /*unused*/)
template<typename BasicJsonType, typename... Args, std::size_t... Idx>
std::tuple<Args...> from_json_tuple_impl_base(BasicJsonType&& j, index_sequence<Idx...> /*unused*/)
{
return std::make_tuple(std::forward<BasicJsonType>(j).at(Idx).template get<typename std::tuple_element<Idx, Tuple>::type>()...);
return std::make_tuple(std::forward<BasicJsonType>(j).at(Idx).template get<Args>()...);
}
template<typename BasicJsonType, typename Tuple, std::size_t... Idx,
enable_if_t<std::is_default_constructible<Tuple>::value, int> = 0>
void from_json_tuple_impl(BasicJsonType && j, Tuple& t, index_sequence<Idx...> /*unused*/, priority_tag<1> /*unused*/)
template<typename BasicJsonType, typename... Args>
std::tuple<Args...> from_json_tuple_impl(BasicJsonType&& j, identity_tag<std::tuple<Args...>> /*unused*/, priority_tag<0> /*unused*/)
{
t = from_json_tuple_impl(std::forward<BasicJsonType>(j), identity_tag<Tuple> {}, priority_tag<0> {});
return from_json_tuple_impl_base<BasicJsonType, Args...>(std::forward<BasicJsonType>(j), index_sequence_for<Args...> {});
}
template<typename BasicJsonType, typename TupleRelated, std::size_t... Idx>
auto from_json_tuple(BasicJsonType&& j, TupleRelated&& t, index_sequence<Idx...> idx)
-> decltype(from_json_tuple_impl(std::forward<BasicJsonType>(j), std::forward<TupleRelated>(t), idx, priority_tag<1> {}))
template<typename BasicJsonType, typename... Args>
void from_json_tuple_impl(BasicJsonType&& j, std::tuple<Args...>& t, priority_tag<1> /*unused*/)
{
t = from_json_tuple_impl_base<BasicJsonType, Args...>(std::forward<BasicJsonType>(j), index_sequence_for<Args...> {});
}
template<typename BasicJsonType, typename TupleRelated>
auto from_json(BasicJsonType&& j, TupleRelated&& t)
-> decltype(from_json_tuple_impl(std::forward<BasicJsonType>(j), std::forward<TupleRelated>(t), priority_tag<1> {}))
{
if (JSON_HEDLEY_UNLIKELY(!j.is_array()))
{
@ -401,21 +398,7 @@ auto from_json_tuple(BasicJsonType&& j, TupleRelated&& t, index_sequence<Idx...>
std::string(j.type_name())));
}
return from_json_tuple_impl(std::forward<BasicJsonType>(j), std::forward<TupleRelated>(t), idx, priority_tag<1> {});
}
template<typename BasicJsonType, typename... Args>
auto from_json(BasicJsonType&& j, std::tuple<Args...>& t)
-> decltype(from_json_tuple(std::forward<BasicJsonType>(j), t, index_sequence_for<Args...> {}))
{
from_json_tuple(std::forward<BasicJsonType>(j), t, index_sequence_for<Args...> {});
}
template<typename BasicJsonType, typename... Args>
auto from_json(BasicJsonType&& j, identity_tag<std::tuple<Args...>> tag)
-> decltype(from_json_tuple(std::forward<BasicJsonType>(j), std::move(tag), index_sequence_for<Args...> {}))
{
return from_json_tuple(std::forward<BasicJsonType>(j), std::move(tag), index_sequence_for<Args...> {});
return from_json_tuple_impl(std::forward<BasicJsonType>(j), std::forward<TupleRelated>(t), priority_tag<1> {});
}
template < typename BasicJsonType, typename Key, typename Value, typename Compare, typename Allocator,