Scarfski/entt
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

concepts: refine iterator concepts

Browse Source
This commit is contained in:
skypjack
2026-01-29 13:51:45 +01:00
parent 2a5f049de8
commit b00038a034
1 changed files with 10 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
src/entt/stl/concepts.hpp
View File

@@ -27,6 +27,7 @@ using std::sentinel_for;
#ifndef ENTT_HAS_ITERATOR_CONCEPTS
# include <concepts>
# include <iterator>
# include <utility>
namespace internal {
@@ -42,8 +43,8 @@ struct iterator_tag<It> {
using type = typename It::iterator_concept;
};
template<typename It>
using iterator_tag_t = typename iterator_tag<It>::type;
template<typename It, typename Tag>
concept has_iterator_tag = std::derived_from<typename iterator_tag<It>::type, Tag>;
} // namespace internal
@@ -58,19 +59,21 @@ concept input_or_output_iterator = requires(It it) {
};
template<typename It>
concept input_iterator = std::derived_from<internal::iterator_tag_t<It>, std::input_iterator_tag>;
concept input_iterator = input_or_output_iterator<It> && internal::has_iterator_tag<It, std::input_iterator_tag>;
template<typename It, typename Type>
concept output_iterator = std::derived_from<internal::iterator_tag_t<It>, std::output_iterator_tag>;
concept output_iterator = input_or_output_iterator<It> && requires(It it, Type &&value) {
*it++ = std::forward<Type>(value);
};
template<typename It>
concept forward_iterator = std::derived_from<internal::iterator_tag_t<It>, std::forward_iterator_tag>;
concept forward_iterator = input_iterator<It> && internal::has_iterator_tag<It, std::forward_iterator_tag>;
template<typename It>
concept bidirectional_iterator = std::derived_from<internal::iterator_tag_t<It>, std::bidirectional_iterator_tag>;
concept bidirectional_iterator = forward_iterator<It> && internal::has_iterator_tag<It, std::bidirectional_iterator_tag>;
template<typename It>
concept random_access_iterator = std::derived_from<internal::iterator_tag_t<It>, std::random_access_iterator_tag>;
concept random_access_iterator = bidirectional_iterator<It> && internal::has_iterator_tag<It, std::random_access_iterator_tag>;
template<class Sentinel, typename It>
concept sentinel_for = input_or_output_iterator<It> && requires(Sentinel sentinel, It it) {