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view: ::empty support for in-place

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This commit is contained in:
Michele Caini
2024-07-04 12:21:48 +02:00
parent 81b30c41a6
commit ce543cf3fb
1 changed files with 9 additions and 2 deletions
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11
src/entt/entity/view.hpp
View File

@@ -685,10 +685,17 @@ public:
/**
* @brief Checks whether a view is empty.
* @tparam Pol Dummy template parameter used for sfinae purposes only.
* @return True if the view is empty, false otherwise.
*/
[[nodiscard]] bool empty() const noexcept {
return (size() == 0u);
template<typename..., deletion_policy Pol = Policy>
[[nodiscard]] std::enable_if_t<Pol != deletion_policy::in_place, bool> empty() const noexcept {
if constexpr(Policy == deletion_policy::swap_and_pop) {
return !leading || leading->empty();
} else {
static_assert(Policy == deletion_policy::swap_only, "Unexpected storage policy");
return !leading || (leading->free_list() == 0u);
}
}
/**