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view: ::size/::size_hint in_place support for single type views

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This commit is contained in:
Michele Caini
2024-07-03 10:28:31 +02:00
parent fce847820e
commit d1073bb181
1 changed files with 13 additions and 1 deletions
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14
src/entt/entity/view.hpp
View File

@@ -660,9 +660,11 @@ public:
/**
* @brief Returns the number of entities that have the given element.
* @tparam Pol Dummy template parameter used for sfinae purposes only.
* @return Number of entities that have the given element.
*/
[[nodiscard]] size_type size() const noexcept {
template<typename..., deletion_policy Pol = Policy>
[[nodiscard]] std::enable_if_t<Pol != deletion_policy::in_place, size_type> size() const noexcept {
if constexpr(Policy == deletion_policy::swap_and_pop) {
return leading ? leading->size() : size_type{};
} else {
@@ -671,6 +673,16 @@ public:
}
}
/**
* @brief Estimates the number of entities iterated by the view.
* @tparam Pol Dummy template parameter used for sfinae purposes only.
* @return Estimated number of entities iterated by the view.
*/
template<typename..., deletion_policy Pol = Policy>
[[nodiscard]] std::enable_if_t<Pol == deletion_policy::in_place, size_type> size_hint() const noexcept {
return leading ? leading->size() : size_type{};
}
/**
* @brief Checks whether a view is empty.
* @return True if the view is empty, false otherwise.