Created 2/3rd of ECS (EC has been added) and World for ECS

sourceCode/ECS.hpp

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+/*
+ * SPDX-FileCopyrightText: Dora "cat" <cat@thenight.club>
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public License,
+ * v. 2.0. If a copy of the MPL was not distributed with this file, You can
+ * obtain one at http://mozilla.org/MPL/2.0/.
+ */
+#ifndef GUARD_TOURMALINE_ECS_H
+#define GUARD_TOURMALINE_ECS_H
+#include <any>
+#include <concepts>
+#include <format>
+#include <typeindex>
+#include <unordered_map>
+#include <utility>
+
+#include "Systems/Logging.hpp"
+#include "Types.hpp"
+
+namespace Tourmaline::ECS {
+using Entity = Tourmaline::Type::UUID;
+class World;
+
+struct BaseComponent {
+public:
+  virtual ~BaseComponent() = default;
+  const Entity &GetOwner();
+
+private:
+  const Entity *owner;
+  friend World;
+};
+
+// Concepts
+template <typename T>
+concept Component = std::derived_from<T, BaseComponent>;
+
+class World {
+public:
+  // Entity
+  Entity CreateEntity();
+  bool EntityExists(const Entity &entity) noexcept;
+  [[nodiscard(
+      "It is not guranteed that an entity can always be destroyed, please make "
+      "sure by checking the returned bool")]]
+  bool DestroyEntity(Entity entity);
+
+  // Components
+  template <Component T, typename... Args>
+  T &AddComponent(const Entity &entity, Args &&...constructionArguments) {
+    // Insert to entity list
+    auto entityIter = GetEntityIterator(
+        entity,
+        std::format(
+            "Cannot add component \"{}\"! Entity \"{}\" does not exist!",
+            typeid(T).name(), entity.asString()),
+        "AddComponent", Systems::Logging::LogLevel::Error);
+
+    auto [componentIter, success] = entityIter->second.try_emplace(
+        typeid(T), T(std::forward<Args>(constructionArguments)...));
+    Systems::Logging::Log(
+        std::format("Cannot add component! Component \"{}\" already exists "
+                    "in entity \"{}\" ",
+                    typeid(T).name(), entity.asString()),
+        "AddComponent", Systems::Logging::LogLevel::Error, !success);
+
+    T &component = std::any_cast<T &>(componentIter->second);
+    component.owner = &entity;
+    return component;
+  }
+
+  template <Component T>
+  [[nodiscard("Discarding an expensive operation's result!")]]
+  T &GetComponent(const Entity &entity) {
+    auto iter = GetEntityIterator(
+        entity,
+        std::format("Can't get entity \"{}\"'s component \"{}\", since "
+                    "entity does not exist!",
+                    entity.asString(), typeid(T).name()),
+        "GetComponent", Systems::Logging::LogLevel::Error);
+
+    auto component = iter->second.find(typeid(T));
+    Systems::Logging::Log(
+        std::format(
+            "Entity \"{}\" does not have component \"{}\", cannot get it!",
+            entity.asString(), typeid(T).name()),
+        "GetComponent", Systems::Logging::LogLevel::Error,
+        component == iter->second.end());
+
+    return std::any_cast<T &>(component->second);
+  }
+
+  template <Component T>
+  [[nodiscard("Discarding an expensive operation's result!")]]
+  bool HasComponent(const Entity &entity) {
+    auto iter = GetEntityIterator(
+        entity,
+        std::format("Can't find if entity \"{}\" has component \"{}\", since "
+                    "entity does not exist!",
+                    entity.asString(), typeid(T).name()));
+
+    return iter != entityComponentList.end() &&
+           (iter->second.find(typeid(T)) != iter->second.end());
+  }
+
+  template <Component T>
+  [[nodiscard(
+      "It is not guranteed that a component can always be removed, please make "
+      "sure by checking the returned bool")]]
+  bool RemoveComponent(const Entity &entity) {
+    auto entityIter = GetEntityIterator(
+        entity,
+        std::format("Cannot remove component {} from entity {}, since entity "
+                    "does not exist!",
+                    typeid(T).name(), entity.asString()),
+        "RemoveComponent", Systems::Logging::LogLevel::Warning);
+    if (entityIter == entityComponentList.end()) {
+      return false;
+    }
+
+    auto componentIter = entityIter->second.find(typeid(T));
+    if (componentIter == entityIter->second.end()) {
+      Systems::Logging::Log(
+          std::format("Cannot remove component {} from entity {}, since entity "
+                      "does not have that component",
+                      typeid(T).name(), entity.asString()),
+          "RemoveComponent", Systems::Logging::LogLevel::Warning);
+      return false;
+    }
+
+    entityIter->second.erase(componentIter);
+    return true;
+  }
+
+private:
+  std::unordered_map<Entity, std::unordered_map<std::type_index, std::any>>
+      entityComponentList{};
+
+  decltype(entityComponentList)::iterator
+  GetEntityIterator(const Entity &entity, const std::string &errorMessage = "",
+                    const std::string &position = "",
+                    Tourmaline::Systems::Logging::LogLevel severity =
+                        Systems::Logging::LogLevel::Warning);
+};
+} // namespace Tourmaline::ECS
+#endif

sourceCode/ECS/Component.cpp

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+/*
+ * SPDX-FileCopyrightText: Dora "cat" <cat@thenight.club>
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public License,
+ * v. 2.0. If a copy of the MPL was not distributed with this file, You can
+ * obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include "../ECS.hpp"
+
+using namespace Tourmaline::ECS;
+
+const Entity &BaseComponent::GetOwner() { return *this->owner; }

sourceCode/ECS/World.cpp

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+/*
+ * SPDX-FileCopyrightText: Dora "cat" <cat@thenight.club>
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public License,
+ * v. 2.0. If a copy of the MPL was not distributed with this file, You can
+ * obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include "../ECS.hpp"
+#include "../Systems/Random.hpp"
+
+using namespace Tourmaline::ECS;
+
+Entity World::CreateEntity() {
+  auto [iterator, success] =
+      entityComponentList.try_emplace(Systems::Random::GenerateUUID());
+
+  Systems::Logging::Log("Failed to create an entity! Possibly by incredible "
+                        "luck generated already existing UUID?",
+                        "CreateEntity", Systems::Logging::LogLevel::Critical,
+                        !success);
+  return iterator->first;
+}
+
+bool World::EntityExists(const Entity &entity) noexcept {
+  return entityComponentList.find(entity) != entityComponentList.end();
+}
+
+bool World::DestroyEntity(Entity entity) {
+  auto entityIter = GetEntityIterator(
+      entity,
+      std::format("Cannot delete entity \"{}\", it does not exist!",
+                  entity.asString()),
+      "DestroyEntity");
+
+  if (entityIter == entityComponentList.end()) {
+    return false;
+  }
+
+  entityComponentList.erase(entityIter);
+  return true;
+}
+
+// Very repetitive code
+decltype(World::entityComponentList)::iterator
+World::GetEntityIterator(const Entity &entity, const std::string &errorMessage,
+                         const std::string &position,
+                         Tourmaline::Systems::Logging::LogLevel severity) {
+  auto iter = entityComponentList.find(entity);
+
+  Systems::Logging::Log(errorMessage, "GetEntityIterator/" + position, severity,
+                        iter == entityComponentList.end());
+  return iter;
+}