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refactor from/to_json(CompatibleArrayType)

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Théo DELRIEU 2018-09-05 17:59:10 +02:00
parent 628f76729e
commit f7c8a2145a
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4 changed files with 80 additions and 78 deletions
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73
include/nlohmann/detail/conversions/from_json.hpp
View file

@ -127,16 +127,6 @@ void from_json(const BasicJsonType& j, EnumType& e)
e = static_cast<EnumType>(val);
}
template<typename BasicJsonType>
void from_json(const BasicJsonType& j, typename BasicJsonType::array_t& arr)
{
if (JSON_UNLIKELY(not j.is_array()))
{
JSON_THROW(type_error::create(302, "type must be array, but is " + std::string(j.type_name())));
}
arr = *j.template get_ptr<const typename BasicJsonType::array_t*>();
}
// forward_list doesn't have an insert method
template<typename BasicJsonType, typename T, typename Allocator,
enable_if_t<std::is_convertible<BasicJsonType, T>::value, int> = 0>
@ -166,24 +156,28 @@ void from_json(const BasicJsonType& j, std::valarray<T>& l)
std::copy(j.m_value.array->begin(), j.m_value.array->end(), std::begin(l));
}
template<typename BasicJsonType, typename CompatibleArrayType>
void from_json_array_impl(const BasicJsonType& j, CompatibleArrayType& arr, priority_tag<0> /*unused*/)
template<typename BasicJsonType>
void from_json_array_impl(const BasicJsonType& j, typename BasicJsonType::array_t& arr, priority_tag<3> /*unused*/)
{
using std::end;
arr = *j.template get_ptr<const typename BasicJsonType::array_t*>();
}
std::transform(j.begin(), j.end(),
std::inserter(arr, end(arr)), [](const BasicJsonType & i)
template <typename BasicJsonType, typename T, std::size_t N>
auto from_json_array_impl(const BasicJsonType& j, std::array<T, N>& arr,
priority_tag<2> /*unused*/)
-> decltype(j.template get<T>(), void())
{
for (std::size_t i = 0; i < N; ++i)
{
// get<BasicJsonType>() returns *this, this won't call a from_json
// method when value_type is BasicJsonType
return i.template get<typename CompatibleArrayType::value_type>();
});
arr[i] = j.at(i).template get<T>();
}
}
template<typename BasicJsonType, typename CompatibleArrayType>
auto from_json_array_impl(const BasicJsonType& j, CompatibleArrayType& arr, priority_tag<1> /*unused*/)
-> decltype(
arr.reserve(std::declval<typename CompatibleArrayType::size_type>()),
j.template get<typename CompatibleArrayType::value_type>(),
void())
{
using std::end;
@ -198,25 +192,34 @@ auto from_json_array_impl(const BasicJsonType& j, CompatibleArrayType& arr, prio
});
}
template<typename BasicJsonType, typename T, std::size_t N>
void from_json_array_impl(const BasicJsonType& j, std::array<T, N>& arr, priority_tag<2> /*unused*/)
template <typename BasicJsonType, typename CompatibleArrayType>
void from_json_array_impl(const BasicJsonType& j, CompatibleArrayType& arr,
priority_tag<0> /*unused*/)
{
for (std::size_t i = 0; i < N; ++i)
using std::end;
std::transform(
j.begin(), j.end(), std::inserter(arr, end(arr)),
[](const BasicJsonType & i)
{
arr[i] = j.at(i).template get<T>();
}
// get<BasicJsonType>() returns *this, this won't call a from_json
// method when value_type is BasicJsonType
return i.template get<typename CompatibleArrayType::value_type>();
});
}
template <
typename BasicJsonType, typename CompatibleArrayType,
enable_if_t <
is_compatible_array_type<BasicJsonType, CompatibleArrayType>::value and
not std::is_same<typename BasicJsonType::array_t,
CompatibleArrayType>::value and
std::is_constructible <
BasicJsonType, typename CompatibleArrayType::value_type >::value,
int > = 0 >
void from_json(const BasicJsonType& j, CompatibleArrayType& arr)
template <typename BasicJsonType, typename CompatibleArrayType,
enable_if_t <
is_compatible_array_type<BasicJsonType, CompatibleArrayType>::value and
not is_compatible_object_type<BasicJsonType, CompatibleArrayType>::value and
not is_compatible_string_type<BasicJsonType, CompatibleArrayType>::value and
not is_basic_json<CompatibleArrayType>::value,
int > = 0 >
auto from_json(const BasicJsonType& j, CompatibleArrayType& arr)
-> decltype(from_json_array_impl(j, arr, priority_tag<3> {}),
j.template get<typename CompatibleArrayType::value_type>(),
void())
{
if (JSON_UNLIKELY(not j.is_array()))
{
@ -224,7 +227,7 @@ void from_json(const BasicJsonType& j, CompatibleArrayType& arr)
std::string(j.type_name())));
}
from_json_array_impl(j, arr, priority_tag<2> {});
from_json_array_impl(j, arr, priority_tag<3> {});
}
template<typename BasicJsonType, typename CompatibleObjectType,

3
include/nlohmann/detail/conversions/to_json.hpp
View file

@ -252,7 +252,8 @@ template <typename BasicJsonType, typename CompatibleArrayType,
enable_if_t<is_compatible_array_type<BasicJsonType,
CompatibleArrayType>::value and
not is_compatible_object_type<
BasicJsonType, CompatibleArrayType>::value,
BasicJsonType, CompatibleArrayType>::value and
not is_compatible_string_type<BasicJsonType, CompatibleArrayType>::value,
int> = 0>
void to_json(BasicJsonType& j, const CompatibleArrayType& arr)
{

3
include/nlohmann/detail/meta/type_traits.hpp
View file

@ -127,9 +127,6 @@ struct is_compatible_array_type_impl <
is_detected<iterator_t, CompatibleArrayType>::value >>
{
static constexpr auto value = not(
is_compatible_object_type<BasicJsonType, CompatibleArrayType>::value or
std::is_constructible<typename BasicJsonType::string_t,
CompatibleArrayType>::value or
is_basic_json_nested_type<BasicJsonType, CompatibleArrayType>::value);
};