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- #pragma once
- #include <iterator> // random_access_iterator_tag
- #include <nlohmann/detail/abi_macros.hpp>
- #include <nlohmann/detail/meta/void_t.hpp>
- #include <nlohmann/detail/meta/cpp_future.hpp>
- NLOHMANN_JSON_NAMESPACE_BEGIN
- namespace detail
- {
- template<typename It, typename = void>
- struct iterator_types {};
- template<typename It>
- struct iterator_types <
- It,
- void_t<typename It::difference_type, typename It::value_type, typename It::pointer,
- typename It::reference, typename It::iterator_category >>
- {
- using difference_type = typename It::difference_type;
- using value_type = typename It::value_type;
- using pointer = typename It::pointer;
- using reference = typename It::reference;
- using iterator_category = typename It::iterator_category;
- };
- template<typename T, typename = void>
- struct iterator_traits
- {
- };
- template<typename T>
- struct iterator_traits < T, enable_if_t < !std::is_pointer<T>::value >>
- : iterator_types<T>
- {
- };
- template<typename T>
- struct iterator_traits<T*, enable_if_t<std::is_object<T>::value>>
- {
- using iterator_category = std::random_access_iterator_tag;
- using value_type = T;
- using difference_type = ptrdiff_t;
- using pointer = T*;
- using reference = T&;
- };
- }
- NLOHMANN_JSON_NAMESPACE_END
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