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snapshot: avoid allocations if possible

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This commit is contained in:
Michele Caini
2023-03-27 14:41:46 +02:00
parent 70f73a0949
commit ca1069e182
1 changed files with 15 additions and 13 deletions
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28
src/entt/entity/snapshot.hpp
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@@ -87,13 +87,11 @@ public:
template<typename Archive>
const basic_snapshot &entities(Archive &archive) const {
const auto &storage = reg->template storage<entity_type>();
const auto sz = static_cast<typename traits_type::entity_type>(storage.size());
const auto released = static_cast<typename traits_type::entity_type>(sz - storage.in_use());
archive(sz);
archive(released);
archive(static_cast<typename traits_type::entity_type>(storage.size()));
archive(static_cast<typename traits_type::entity_type>(storage.in_use()));
for(auto first = storage.data(), last = first + sz; first != last; ++first) {
for(auto first = storage.data(), last = first + storage.size(); first != last; ++first) {
archive(*first);
}
@@ -224,18 +222,22 @@ public:
*/
template<typename Archive>
const basic_snapshot_loader &entities(Archive &archive) const {
auto &storage = reg->template storage<entity_type>();
typename traits_type::entity_type length{};
typename traits_type::entity_type released{};
typename traits_type::entity_type in_use{};
entity_type entity = null;
archive(length);
archive(released);
std::vector<entity_type> all(length);
archive(in_use);
storage.reserve(length);
for(std::size_t pos{}; pos < length; ++pos) {
archive(all[pos]);
archive(entity);
storage.emplace(entity);
}
reg->assign(all.cbegin(), all.cend(), released);
storage.in_use(in_use);
return *this;
}
@@ -441,15 +443,15 @@ public:
template<typename Archive>
basic_continuous_loader &entities(Archive &archive) {
typename traits_type::entity_type length{};
typename traits_type::entity_type released{};
typename traits_type::entity_type in_use{};
archive(length);
archive(released);
archive(in_use);
entity_type entt{null};
std::size_t pos{};
for(const auto last = length - released; pos < last; ++pos) {
for(; pos < in_use; ++pos) {
archive(entt);
restore(entt);
}