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feat: utils::range_value_t #29

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merged 1 commit into from
Oct 26, 2023
Merged

feat: utils::range_value_t #29

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28 changes: 17 additions & 11 deletions include/json.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,17 @@

namespace json
{
namespace utils
{
template <typename T>
using iterator_t = decltype(std::declval<T&>().begin());
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template <typename T>
using remove_cvref_t = std::remove_cv_t<std::remove_reference_t<T>>;
template <typename T>
using iter_value_t = typename std::iterator_traits<remove_cvref_t<T>>::value_type;
template <typename R>
using range_value_t = iter_value_t<iterator_t<R>>;
}
template <typename string_t>
class basic_value;
template <typename string_t>
Expand Down Expand Up @@ -273,8 +284,7 @@ class basic_array
explicit basic_array(basic_value<string_t>&& val);

template <typename collection_t,
typename _ = std::enable_if_t<std::is_constructible_v<
value_type, typename std::iterator_traits<typename collection_t::iterator>::value_type>>>
typename = std::enable_if_t<std::is_constructible_v<value_type, utils::range_value_t<collection_t>>>>
basic_array(collection_t arr)
: _array_data(std::make_move_iterator(arr.begin()), std::make_move_iterator(arr.end()))
{}
Expand Down Expand Up @@ -384,8 +394,8 @@ class basic_object
basic_object(std::initializer_list<value_type> init_list);
explicit basic_object(const basic_value<string_t>& val);
explicit basic_object(basic_value<string_t>&& val);
template <typename map_t, typename _ = std::enable_if_t<std::is_constructible_v<
value_type, typename std::iterator_traits<typename map_t::iterator>::value_type>>>
template <typename map_t,
typename = std::enable_if_t<std::is_constructible_v<value_type, utils::range_value_t<map_t>>>>
basic_object(map_t map) : _object_data(std::make_move_iterator(map.begin()), std::make_move_iterator(map.end()))
{}

Expand Down Expand Up @@ -2534,20 +2544,16 @@ namespace _serialization_helper
static constexpr bool value = decltype(test<T>(0))::value;
};

template <typename...>
using void_t = void;

template <typename T, typename = void>
constexpr bool is_container = false;
template <typename T>
constexpr bool is_container<T, void_t<typename T::value_type, typename T::iterator,
typename std::iterator_traits<typename T::iterator>::value_type>> =
std::is_same_v<typename T::value_type, typename std::iterator_traits<typename T::iterator>::value_type>;
constexpr bool is_container<T, std::void_t<typename T::value_type, utils::range_value_t<T>>> =
std::is_same_v<typename T::value_type, utils::range_value_t<T>>;

template <typename T, typename = void>
constexpr bool is_map = false;
template <typename T>
constexpr bool is_map<T, void_t<typename T::key_type, typename T::mapped_type>> = is_container<T>;
constexpr bool is_map<T, std::void_t<typename T::key_type, typename T::mapped_type>> = is_container<T>;

template <typename T, typename = void>
constexpr bool is_collection = false;
Expand Down