47 lines
1.2 KiB
C++
47 lines
1.2 KiB
C++
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#pragma once
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#include <iterator> // random_access_iterator_tag
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#include <nlohmann/detail/meta/void_t.hpp>
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namespace nlohmann
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{
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namespace detail
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{
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template <class It, class = void>
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struct _iterator_types {};
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template <class It>
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struct _iterator_types<
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It,
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void_t<typename It::difference_type, typename It::value_type, typename It::pointer,
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typename It::reference, typename It::iterator_category>> {
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using difference_type = typename It::difference_type;
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using value_type = typename It::value_type;
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using pointer = typename It::pointer;
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using reference = typename It::reference;
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using iterator_category = typename It::iterator_category;
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};
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template <class Iter>
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struct iterator_traits : _iterator_types<Iter> {};
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template <class T>
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struct iterator_traits<T*> {
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typedef std::random_access_iterator_tag iterator_category;
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typedef T value_type;
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typedef ptrdiff_t difference_type;
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typedef T* pointer;
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typedef T& reference;
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};
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template <class T>
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struct iterator_traits<const T*> {
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typedef std::random_access_iterator_tag iterator_category;
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typedef T value_type;
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typedef ptrdiff_t difference_type;
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typedef const T* pointer;
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typedef const T& reference;
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};
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}
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}
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