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Proper support for zero handles

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bloeys
2023-10-09 05:03:48 +04:00
parent c998fc26ce
commit 80ce6d60d2
2 changed files with 10 additions and 0 deletions
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4
registry/registry.go
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@ -77,6 +77,10 @@ func (r *Registry[T]) New() (*T, Handle) {
func (r *Registry[T]) Get(id Handle) *T {
if id.IsZero() {
return nil
}
index := id.Index()
assert.T(index < uint64(len(r.Handles)), "Failed to get entity because of invalid entity handle. Handle index is %d while registry only has %d slots. Handle: %+v", index, r.ItemCount, id)

6
registry/registry_handle.go
View File

@ -16,6 +16,12 @@ const (
// Byte 1: Generation; Byte 2: Flags; Bytes 3-8: Index
type Handle uint64
// IsZero reports whether the handle is in its default 'zero' state.
// A zero handle is an invalid handle that does NOT point to any entity
func (h Handle) IsZero() bool {
return h == 0
}
func (h Handle) HasFlag(ef HandleFlag) bool {
return h.Flags()&ef > 0
}