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view. branch-less centralized swap-only mode check

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This commit is contained in:
Michele Caini
2024-03-29 13:41:41 +01:00
parent 2f8998bd92
commit 5908d01017
1 changed files with 14 additions and 12 deletions
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26
src/entt/entity/view.hpp
View File

@@ -216,6 +216,13 @@ class basic_common_view {
template<typename Return, typename View, typename Other, std::size_t... VGet, std::size_t... VExclude, std::size_t... OGet, std::size_t... OExclude>
friend Return internal::view_pack(const View &, const Other &, std::index_sequence<VGet...>, std::index_sequence<VExclude...>, std::index_sequence<OGet...>, std::index_sequence<OExclude...>);
auto offset() const noexcept {
ENTT_ASSERT(index != Get, "Invalid view");
const auto *view = pools[index];
const size_type len[]{view->size(), view->free_list()};
return len[view->policy() == deletion_policy::swap_only];
}
protected:
/*! @cond TURN_OFF_DOXYGEN */
basic_common_view() noexcept = default;
@@ -288,12 +295,7 @@ public:
* @return An iterator to the first entity of the view.
*/
[[nodiscard]] iterator begin() const noexcept {
if(index != Get) {
const auto it = (pools[index]->policy() == deletion_policy::swap_only) ? (pools[index]->end() - pools[index]->free_list()) : pools[index]->begin();
return iterator{it, pools, filter, index};
}
return iterator{};
return (index != Get) ? iterator{pools[index]->end() - static_cast<typename iterator::difference_type>(offset()), pools, filter, index} : iterator{};
}
/**
@@ -321,10 +323,10 @@ public:
*/
[[nodiscard]] entity_type back() const noexcept {
if(index != Get) {
size_type pos{};
const size_type last = (pools[index]->policy() == deletion_policy::swap_only) ? pools[index]->free_list() : pools[index]->size();
for(; pos != last && !contains((*pools[index])[pos]); ++pos) {}
return pos == last ? null : (*pools[index])[pos];
auto it = pools[index]->rbegin();
const auto last = it + static_cast<typename iterator::difference_type>(offset());
for(; it != last && !contains(*it); ++it) {}
return it == last ? null : *it;
}
return null;
@@ -356,8 +358,8 @@ public:
[[nodiscard]] bool contains(const entity_type entt) const noexcept {
return (index != Get)
&& internal::all_of(pools.begin(), pools.end(), entt)
&& ((pools[index]->policy() != deletion_policy::swap_only) || (pools[index]->index(entt) < pools[index]->free_list()))
&& internal::none_of(filter.begin(), filter.end(), entt);
&& internal::none_of(filter.begin(), filter.end(), entt)
&& pools[index]->index(entt) < offset();
}
protected: