Flecs order_by bug example

gistfile1.txt

#include <iostream>

#include <flecs.h>

struct ExampleSharedComponent {
	int zOrder;
};

struct AsteroidPrefabTag {
};

struct RocketPrefabTag {
};

struct AsteroidTag {
};

struct RocketTag {
};

int main(int argc, char* argv[])
{
	flecs::world ecs(argc, argv);

	ecs.prefab<AsteroidPrefabTag>("PrefabAsteroid")
			.add<AsteroidTag>()
			.emplace<ExampleSharedComponent>(1);

	ecs.prefab<RocketPrefabTag>("PrefabRocket")
			.add<RocketTag>()
			.emplace<ExampleSharedComponent>(2);

	auto s = ecs.query_builder<>("ExampleSystem")
					 .with<ExampleSharedComponent>()
					 .with<AsteroidTag>()
					 .oper(flecs::Or)
					 .with<RocketTag>()
					 .order_by<const ExampleSharedComponent>(
							 [](flecs::entity_t e1, const ExampleSharedComponent* p1,
								flecs::entity_t e2, const ExampleSharedComponent* p2) {
								 return (p1->zOrder > p2->zOrder) - (p1->zOrder < p2->zOrder);
							 })
					 .build();

	for (size_t i = 0; i < 4; ++i)
	{
		ecs.entity()
				.is_a(ecs.prefab<RocketPrefabTag>());
	}

	for (size_t i = 0; i < 4; ++i)
	{
		ecs.entity()
				.is_a(ecs.prefab<AsteroidPrefabTag>());
	}

	s.each([](flecs::entity entity) {
		if (entity.has<AsteroidTag>())
		{
			std::cout << "Asteroid" << std::endl;
		}

		if (entity.has<RocketTag>())
		{
			std::cout << "Rocket" << std::endl;
		}
	});

	std::cout << "" << std::endl;
	std::cout << "" << std::endl;
	std::cout << "" << std::endl;
	std::cout << "" << std::endl;

	for (size_t i = 0; i < 4; ++i)
	{
		ecs.entity()
				.is_a(ecs.prefab<RocketPrefabTag>());
	}

	for (size_t i = 0; i < 4; ++i)
	{
		ecs.entity()
				.is_a(ecs.prefab<AsteroidPrefabTag>());
	}

	s.each([](flecs::entity entity) {
		if (entity.has<AsteroidTag>())
		{
			std::cout << "Asteroid" << std::endl;
		}

		if (entity.has<RocketTag>())
		{
			std::cout << "Rocket" << std::endl;
		}
	});

	ecs.app()
			.enable_rest()
			.enable_monitor()
			.target_fps(60)
			.run();
}