92 lines
2.7 KiB
C++
92 lines
2.7 KiB
C++
/*
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* SPDX-FileCopyrightText: Dora "cat" <cat@thenight.club>
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* SPDX-License-Identifier: MPL-2.0
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*
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* This Source Code Form is subject to the terms of the Mozilla Public License,
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* v. 2.0. If a copy of the MPL was not distributed with this file, You can
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* obtain one at http://mozilla.org/MPL/2.0/.
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*/
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#ifndef GUARD_TOURMALINE_ECS_H
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#define GUARD_TOURMALINE_ECS_H
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#include <any>
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#include <concepts>
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#include <format>
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#include <typeindex>
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#include <utility>
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#include "../Containers/DualkeyMap.hpp"
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#include "../Types.hpp"
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#include "Logging.hpp"
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namespace Tourmaline::Systems::ECS {
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using Entity = Tourmaline::Type::UUID;
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class World;
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struct BaseComponent {
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public:
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virtual ~BaseComponent() = default;
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const Entity &GetOwner();
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private:
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const Entity *owner;
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friend World;
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};
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// Concepts
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template <typename T>
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concept Component = std::derived_from<T, BaseComponent>;
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class World {
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public:
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// Entity
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[[nodiscard]]
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Entity CreateEntity();
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bool EntityExists(const Entity &entity) noexcept;
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[[nodiscard("It is not guaranteed that an entity can always be destroyed, "
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"please make sure by checking the returned bool")]]
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bool DestroyEntity(Entity entity);
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// Components
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template <Component component, typename... Args>
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component &AddComponent(const Entity &entity,
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Args &&...constructionArguments) {
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auto newComponent = entityComponentMap.insert(
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entity, typeid(component), component(constructionArguments...));
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return std::any_cast<component &>(std::get<2>(newComponent));
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}
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template <Component component>
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[[nodiscard("Discarding an expensive operation's result!")]]
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component &GetComponent(const Entity &entity) {
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auto result = entityComponentMap.query(entity, typeid(component));
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if (result.empty()) {
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Logging::Log(std::format("Entity {} does not have component {}!",
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entity.asString(), typeid(component).name()),
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"ECS/GetComponent", Logging::LogLevel::Error);
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}
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return std::any_cast<component &>(result.begin()->second);
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}
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template <Component component>
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[[nodiscard("Discarding an expensive operation's result!")]]
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bool HasComponent(const Entity &entity) {
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// TO BE IMPLEMENTED
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return true;
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}
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template <Component component>
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[[nodiscard("It is not guaranteed that a component can always be removed, "
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"please make sure by checking the returned bool")]]
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bool RemoveComponent(const Entity &entity) {
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return entityComponentMap.remove(entity, typeid(component));
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}
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private:
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Tourmaline::Containers::DualkeyMap<Entity, std::type_index, std::any>
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entityComponentMap{};
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};
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} // namespace Tourmaline::Systems::ECS
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#endif
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