48 lines
1 KiB
C++
48 lines
1 KiB
C++
#pragma once
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#include <cstdint>
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#include <bitset>
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#include <numeric>
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#ifndef MAX_ZECSY_ENTITIES
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#define MAX_ZECSY_ENTITIES 65536
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#endif // !MAX_ZECSY_ENTITIES
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namespace zecsy
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{
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using entity_id = uint64_t;
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class world final
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{
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public:
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world() = default;
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world(const world &) = default;
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world(world &&) = default;
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world &operator=(const world &) = default;
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world &operator=(world &&) = default;
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entity_id make_entity();
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void destroy_entity(entity_id e);
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bool is_alive(entity_id e) const;
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private:
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std::bitset<MAX_ZECSY_ENTITIES> entities_bitset;
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entity_id entity_counter = 0;
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};
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inline entity_id world::make_entity()
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{
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auto id = ++entity_counter;
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entities_bitset.set(id);
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return id;
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}
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inline void world::destroy_entity(entity_id e)
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{
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entities_bitset.reset(e);
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}
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inline bool world::is_alive(entity_id e) const
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{
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return entities_bitset.test(e);
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}
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};
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