Code Snippet

using Leopotam.Ecs;

namespace TestLeoEcs.tests
{
    public class TestUpdateFilters
    {
        private EcsWorld _world;
        private EcsSystems _systems;

        public TestUpdateFilters()
        {
            _world = new EcsWorld();
            _systems = new EcsSystems(_world);

            _systems.Add(new RemoveEntitySystem());

            _systems.ProcessInjects();
            _systems.Init();

            _systems.Run();
            _world.EndFrame();
        }
    }

    public class RemoveEntitySystem : IEcsInitSystem, IEcsRunSystem
    {
        EcsWorld _world;

        private EcsFilter<IncludeComponent> _incFilter;
        private EcsFilter<IncludeComponent>.Exclude<ExcludeComponent> _incExFilter;

        public void Init()
        {
            _world.NewEntityWith<IncludeComponent>(out var includeComponent1);
            _world.NewEntityWith<IncludeComponent, ExcludeComponent>(out var includeComponent2, out var excludeComponent);
        }

        public void Run()
        {
            ref var entity = ref _incFilter.Entities[0];
            entity.Destroy();
        }
    }

    public class IncludeComponent
    {}

    public class ExcludeComponent : IEcsOneFrame, IEcsIgnoreInFilter
    {}
}