54 lines
1.3 KiB
C
54 lines
1.3 KiB
C
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#pragma once
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#include <cstdint>
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#include <functional>
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namespace extra2d {
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/**
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* @brief 轻量级资源句柄
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*
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* 只包含 32-bit 索引和世代，类似 ECS 中的 Entity ID。
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* 不直接管理生命周期，由 AssetStorage 统一管理。
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*
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* @tparam T 资源类型
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*/
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template<typename T>
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class Handle {
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public:
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using Index = uint32_t;
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using Generation = uint32_t;
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Handle() : index_(0), generation_(0) {}
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Handle(Index index, Generation generation)
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: index_(index), generation_(generation) {}
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bool isValid() const { return generation_ != 0; }
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Index index() const { return index_; }
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Generation generation() const { return generation_; }
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bool operator==(const Handle& other) const {
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return index_ == other.index_ && generation_ == other.generation_;
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}
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bool operator!=(const Handle& other) const { return !(*this == other); }
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static Handle invalid() { return Handle(); }
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private:
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Index index_;
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Generation generation_;
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};
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} // namespace extra2d
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namespace std {
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template<typename T>
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struct hash<extra2d::Handle<T>> {
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size_t operator()(const extra2d::Handle<T>& h) const {
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return std::hash<uint64_t>{}(
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(static_cast<uint64_t>(h.index()) << 32) | h.generation()
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);
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}
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};
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}
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