50 lines
1.0 KiB
C++
50 lines
1.0 KiB
C++
#pragma once
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#include <concepts>
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#include <functional>
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#include <memory>
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#include <optional>
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#include <vector>
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struct Entity;
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class Component;
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class Component {
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public:
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Entity *entity = nullptr;
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virtual void Setup() = 0;
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virtual void Update(float dt) = 0;
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virtual void Cleanup() = 0;
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virtual ~Component() = default;
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};
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struct Entity {
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std::vector<std::shared_ptr<Component>> components;
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template <std::derived_from<Component> T> T &AddComponent() {
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auto &ptr = components.emplace_back(std::make_shared<T>());
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ptr->entity = this;
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ptr->Setup();
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return static_cast<T &>(*ptr);
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}
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template <std::derived_from<Component> T>
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std::optional<std::reference_wrapper<T>> GetComponent() const {
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for (auto &c : components) {
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T *cast = dynamic_cast<T *>(c.get());
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if (cast) {
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return *cast;
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}
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}
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return {};
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}
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void Update(float dt) {
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for (auto &c : components) {
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c->Update(dt);
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}
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}
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};
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