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expose EntityManager::getIndex() publicly

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This can be needed for interactions with an outside entity system.
Use with caution.
This commit is contained in:
Mathias Agopian
2026-04-14 23:51:24 -07:00
committed by Mathias Agopian
parent 3b5776a232
commit eb3d592d18
1 changed files with 14 additions and 11 deletions
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25
libs/utils/include/utils/EntityManager.h
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@@ -78,7 +78,7 @@ public:
// Return whether the given Entity has been destroyed (false) or not (true).
// Thread safe.
bool isAlive(Entity e) const noexcept {
bool isAlive(Entity const e) const noexcept {
assert(getIndex(e) < RAW_INDEX_COUNT);
return (!e.isNull()) && (getGeneration(e) == mGens[getIndex(e)]);
}
@@ -94,7 +94,7 @@ public:
/* no user serviceable parts below */
// current generation of the given index. Use for debugging and testing.
uint8_t getGenerationForIndex(size_t index) const noexcept {
uint8_t getGenerationForIndex(size_t const index) const noexcept {
return mGens[index];
}
@@ -107,6 +107,11 @@ public:
void dumpActiveEntities(utils::io::ostream& out) const;
#endif
// use carefully, several entities can have the same index.
static Entity::Type getIndex(Entity const e) noexcept {
return e.getId() & INDEX_MASK;
}
private:
friend class EntityManagerImpl;
EntityManager();
@@ -114,22 +119,20 @@ private:
// GENERATION_SHIFT determines how many simultaneous Entities are available, the
// minimum memory requirement is 2^GENERATION_SHIFT bytes.
static constexpr const int GENERATION_SHIFT = 17;
static constexpr const size_t RAW_INDEX_COUNT = (1 << GENERATION_SHIFT);
static constexpr const Entity::Type INDEX_MASK = (1 << GENERATION_SHIFT) - 1u;
static constexpr int GENERATION_SHIFT = 17;
static constexpr size_t RAW_INDEX_COUNT = (1 << GENERATION_SHIFT);
static constexpr Entity::Type INDEX_MASK = (1 << GENERATION_SHIFT) - 1u;
static inline Entity::Type getGeneration(Entity e) noexcept {
static Entity::Type getGeneration(Entity const e) noexcept {
return e.getId() >> GENERATION_SHIFT;
}
static inline Entity::Type getIndex(Entity e) noexcept {
return e.getId() & INDEX_MASK;
}
static inline Entity::Type makeIdentity(Entity::Type g, Entity::Type i) noexcept {
static Entity::Type makeIdentity(Entity::Type const g, Entity::Type const i) noexcept {
return (g << GENERATION_SHIFT) | (i & INDEX_MASK);
}
// stores the generation of each index.
uint8_t * const mGens;
uint8_t* const mGens;
};
} // namespace utils