Examples for Entity extensions

EntityExtensions.cs

[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static T GetComponentData<T>(this Entity entity, World world = null) where T: struct, IComponentData
{
    if (world == null)
    {
        world = World.Active;
    }

    return world.EntityManager.GetComponentData<T>(entity);
}

[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static void AddComponent<T>(this Entity entity, World world = null) where T: struct, IComponentData
{
    if (world == null)
    {
        world = World.Active;
    }

    world.EntityManager.AddComponent(entity, ComponentType.ReadWrite<T>());
}

[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static void AddComponentData<T>(this Entity entity, T componentData, World world = null) where T: struct, IComponentData
{
    if (world == null)
    {
        world = World.Active;
    }

    world.EntityManager.AddComponentData(entity, componentData);
}

[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static void SetComponentData<T>(this Entity entity, T componentData, World world = null) where T: struct, IComponentData
{
    if (world == null)
    {
        world = World.Active;
    }

    world.EntityManager.SetComponentData(entity, componentData);
}

[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static bool HasComponent<T>(this Entity entity, World world = null) where T: struct, IComponentData
{
    if (world == null)
    {
        world = World.Active;
    }

    return world.EntityManager.HasComponent<T>(entity);
}

[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static void RemoveComponent<T>(this Entity entity, World world = null) where T: struct, IComponentData
{
    if (world == null)
    {
        world = World.Active;
    }

    world.EntityManager.RemoveComponent<T>(entity);
}

[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static void DestroyEntity(this Entity entity, World world = null)
{
    if (world == null)
    {
        world = World.Active;
    }

    world.EntityManager.DestroyEntity(entity);
}

public static void DestroyLater(this Entity entity, EntityCommandBuffer buffer)
{
    buffer.DestroyEntity(entity);
}