🛠️🐜 Antkeeper superbuild with dependencies included https://antkeeper.com
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#include <entt/entt.hpp>
#include <cstdint>
struct position {
float x;
float y;
};
struct velocity {
float dx;
float dy;
};
void update(entt::registry &registry) {
auto view = registry.view<position, velocity>();
for(auto entity: view) {
// gets only the components that are going to be used ...
auto &vel = view.get<velocity>(entity);
vel.dx = 0.;
vel.dy = 0.;
// ...
}
}
void update(std::uint64_t dt, entt::registry &registry) {
registry.view<position, velocity>().each([dt](auto &pos, auto &vel) {
// gets all the components of the view at once ...
pos.x += vel.dx * dt;
pos.y += vel.dy * dt;
// ...
});
}
int main() {
entt::registry registry;
std::uint64_t dt = 16;
for(auto i = 0; i < 10; ++i) {
auto entity = registry.create();
registry.assign<position>(entity, i * 1.f, i * 1.f);
if(i % 2 == 0) { registry.assign<velocity>(entity, i * .1f, i * .1f); }
}
update(dt, registry);
update(registry);
// ...
return EXIT_SUCCESS;
}