Method GetComponentRO

GetComponentRO<T>(Entity)

Gets a reference to a component for an entity, for read-only access.

Declaration

public static RefRO<T> GetComponentRO<T>(Entity entity) where T : unmanaged, IComponentData

Parameters

Type	Name	Description
Entity	entity	The entity.

Returns

Type	Description
RefRO<T>	A read/write reference to component T.

Type Parameters

Name	Description
T	The type of component to retrieve.

Remarks

Use this method to look up data in another entity using its Entity object. For example, if you have a component that contains an Entity field, you can look up the component data for the referenced entity using this method.

When iterating over a set of entities via IJobEntity or Query<T1>(), do not use this method to access data of the current entity in the set. This function is much slower than accessing the data directly (by passing the component containing the data to your lambda iteration function as a parameter).

When you call this method it gets replaced with component access methods through ComponentLookup<T>.

This lookup method results in a slower, indirect memory access. When possible, organize your data to minimize the need for indirect lookups.

Exceptions

Type	Condition
ArgumentException	Thrown if the component type has no fields.