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98 lines
2.6 KiB
98 lines
2.6 KiB
#pragma once
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#include <functional>
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#include <typeindex>
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#include <typeinfo>
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#include <unordered_map>
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#include <any>
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namespace DinkyECS {
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typedef unsigned long Entity;
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typedef std::unordered_map<Entity, std::any> EntityMap;
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struct World {
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unsigned long entity_count = 0;
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std::unordered_map<std::type_index, EntityMap> $components;
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std::unordered_map<std::type_index, std::any> $facts;
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Entity entity() {
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return ++entity_count;
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}
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template <typename Comp>
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EntityMap& entity_map_for() {
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return $components[std::type_index(typeid(Comp))];
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}
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template <typename Comp>
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void set(Comp val) {
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$facts[std::type_index(typeid(Comp))] = val;
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}
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template <typename Comp>
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Comp &get() {
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// use .at to get std::out_of_range if fact not set
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std::any &res = $facts.at(std::type_index(typeid(Comp)));
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return std::any_cast<Comp&>(res);
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}
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template <typename Comp>
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void assign(Entity ent, Comp val) {
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EntityMap &map = entity_map_for<Comp>();
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map[ent] = val;
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}
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template <typename Comp>
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Comp &component(Entity ent) {
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EntityMap &map = entity_map_for<Comp>();
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// use .at for bounds checking
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std::any &res = map.at(ent);
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return std::any_cast<Comp&>(res);
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}
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template<typename Comp>
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void system(std::function<void(const Entity&, Comp&)> cb) {
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EntityMap &map = entity_map_for<Comp>();
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for(auto& [entity, any_comp] : map) {
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Comp &res = std::any_cast<Comp&>(any_comp);
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cb(entity, res);
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}
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}
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template<typename Comp>
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void remove(Entity ent) {
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EntityMap &map = entity_map_for<Comp>();
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map.erase(ent);
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}
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template<typename CompA, typename CompB>
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void system(std::function<void(const Entity&, CompA&, CompB&)> cb) {
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EntityMap &map_a = entity_map_for<CompA>();
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EntityMap &map_b = entity_map_for<CompB>();
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for(auto& [entity, any_a] : map_a) {
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if(map_b.contains(entity)) {
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CompA &res_a = std::any_cast<CompA&>(any_a);
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CompB &res_b = component<CompB>(entity);
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cb(entity, res_a, res_b);
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}
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}
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}
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template<typename CompA, typename CompB>
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std::function<void()> runner(std::function<void(const Entity&, CompA&, CompB&)> cb) {
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return [&]{
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system<CompA, CompB>(cb);
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};
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}
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template<typename CompA>
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std::function<void()> runner(std::function<void(const Entity&, CompA&)> cb) {
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return [&]{
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system<CompA>(cb);
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};
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}
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};
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}
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