Method HasSingleton
HasSingleton<T>()
Checks whether a singelton component of the specified type exists. Note that if querying a singleton component from a system-associated entity, the query must include either EntityQueryOptions.IncludeSystems or the SystemInstance component.
Declaration
public bool HasSingleton<T>()
Returns
Type | Description |
---|---|
bool | True, if a singleton is found to match exactly once with the specified typeEntityQuery. |
Type Parameters
Name | Description |
---|---|
T | The IComponentData subtype of the singleton component. This component type must not implement IEnableableComponent |
Exceptions
Type | Condition |
---|---|
InvalidOperationException | Thrown if the number of entities that match this query is greater than one. |