impl.hpp

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#pragma once
 
#include "builder.hpp"
 
namespace flecs 
{
 
struct observer final : entity
{
    using entity::entity;
 
    explicit observer() : entity() { }
 
    observer(flecs::world_t *world, ecs_observer_desc_t *desc) {
        world_ = world;
        id_ = ecs_observer_init(world, desc);
    }
 
    void ctx(void *ctx) {
        ecs_observer_desc_t desc = {};
        desc.entity = id_;
        desc.ctx = ctx;
        ecs_observer_init(world_, &desc);
    }
 
    void* ctx() const {
        return ecs_observer_get(world_, id_)->ctx;
    }
 
    flecs::query<> query() const {
        return flecs::query<>(ecs_observer_get(world_, id_)->query);
    }
};
 
// Mixin implementation
inline observer world::observer(flecs::entity e) const {
    return flecs::observer(world_, e);
}
 
template <typename... Comps, typename... Args>
inline observer_builder<Comps...> world::observer(Args &&... args) const {
    return flecs::observer_builder<Comps...>(world_, FLECS_FWD(args)...);
}
 
} // namespace flecs