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template <typename T, typename... Args>
T & ComponentManager::AddComponent(std::uint32_t id, Args &&... args) {
//Determine the type of T (this is used as the key of the unordered_map<>)
std::type_index type = typeid(T);
//Check if this component type is already in the unordered_map<>
if (mComponents.find(type) == mComponents.end()) {
//If not, create a new (empty) vector<> of vector<unique_ptr<Component>>
mComponents[type]
= std::vector<std::vector<std::unique_ptr<Component>>>();
}
//Resize the vector<> if the id is greater than the current size
if (id >= mComponents[type].size()) {
//Initialize new slots to nullptr (resize does automatically init to nullptr)
mComponents[type].resize(id + 1);
}
//Create a new component of type T using perfect forwarding and store its unique_ptr in the vector<>
mComponents[type][id].push_back(
std::make_unique<T>(std::forward<Args>(args)...));
return static_cast<T &>(*mComponents[type][id].back().get());
}
template <typename T>
void ComponentManager::DeleteComponentsById(std::uint32_t id) {
//Determine the type of T (this is used as the key of the unordered_map<>)
std::type_index type = typeid(T);
//Find the type (in the unordered_map<>)
if (mComponents.find(type) != mComponents.end()) {
//Get the correct vector<>
std::vector<std::vector<std::unique_ptr<Component>>> & componentArray
= mComponents[type];
//Make sure that the id (that we are looking for) is within the boundaries of the vector<>
if (id < componentArray.size()) {
//Clear the whole vector<> of this specific type and id
componentArray[id].clear();
}
}
}
template <typename T>
void ComponentManager::DeleteComponents() {
//Determine the type of T (this is used as the key of the unordered_map<>)
std::type_index type = typeid(T);
//Find the type (in the unordered_map<>)
if (mComponents.find(type) != mComponents.end()) {
//Clear the whole vector<> of this specific type
mComponents[type].clear();
}
}
template <typename T>
std::vector<std::reference_wrapper<T>>
ComponentManager::GetComponentsByID(std::uint32_t id) const {
//Determine the type of T (this is used as the key of the unordered_map<>)
std::type_index type = typeid(T);
//Create an empty vector<>
std::vector<std::reference_wrapper<T>> componentVector;
//Find the type (in the unordered_map<>)
if (mComponents.find(type) != mComponents.end()) {
//Get the correct vector<>
const std::vector<std::vector<std::unique_ptr<Component>>> &
componentArray
= mComponents.at(type);
//Make sure that the id (that we are looking for) is within the boundaries of the vector<>
if (id < componentArray.size()) {
//Loop trough the whole vector<>
for (const std::unique_ptr<Component> & componentPtr :
componentArray[id]) {
//Cast the unique_ptr to a raw pointer
T * castedComponent = static_cast<T *>(componentPtr.get());
//Ensure that the cast was successful
if (castedComponent) {
//Add the dereferenced raw pointer to the vector<>
componentVector.push_back(*castedComponent);
}
}
}
}
//Return the vector<>
return componentVector;
}
template <typename T>
std::vector<std::reference_wrapper<T>>
ComponentManager::GetComponentsByType() const {
//Determine the type of T (this is used as the key of the unordered_map<>)
std::type_index type = typeid(T);
//Create an empty vector<>
std::vector<std::reference_wrapper<T>> componentVector;
//std::uint32_t id = 0; //Set the id to 0 (the id will also be stored in the returned vector<>)
//Find the type (in the unordered_map<>)
if (mComponents.find(type) != mComponents.end()) {
//Get the correct vector<>
const std::vector<std::vector<std::unique_ptr<Component>>> &
componentArray
= mComponents.at(type);
//Loop through the whole vector<>
for (const std::vector<std::unique_ptr<Component>> & component :
componentArray) {
//Loop trough the whole vector<>
for (const std::unique_ptr<Component> & componentPtr : component) {
//Cast the unique_ptr to a raw pointer
T * castedComponent = static_cast<T *>(componentPtr.get());
//Ensure that the cast was successful
if (castedComponent) {
//Pair the dereferenced raw pointer and the id and add it to the vector<>
componentVector.emplace_back(std::ref(*castedComponent));
}
}
//++id; //Increase the id (the id will also be stored in the returned vector<>)
}
}
//Return the vector<>
return componentVector;
}
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