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stl: refine iterator concepts

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skypjack
2026-01-29 16:59:28 +01:00
parent cabdc1d1e3
commit 9509d37431
1 changed files with 21 additions and 1 deletions
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22
src/entt/stl/iterator.hpp
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@@ -31,8 +31,28 @@ using std::sentinel_for;
namespace internal {
template<typename It>
concept has_iterator_category = requires {
typename std::iterator_traits<It>::iterator_category;
};
template<typename It>
concept has_iterator_concept = has_iterator_category<It> && requires {
typename It::iterator_concept;
};
template<has_iterator_category It>
struct iterator_tag {
using type = typename std::iterator_traits<It>::iterator_category;
};
template<has_iterator_concept It>
struct iterator_tag<It> {
using type = typename It::iterator_concept;
};
template<typename It, typename Tag>
concept has_iterator_tag = std::derived_from<typename It::iterator_concept, Tag> || std::derived_from<typename std::iterator_traits<It>::iterator_category, Tag>;
concept has_iterator_tag = std::derived_from<typename iterator_tag<It>::type, Tag>;
} // namespace internal