Merge remote-tracking branch 'origin/master' into max/POC-ECS-memory-efficient

1 files changed, 152 insertions, 0 deletions

diff --git a/src/crepe/ComponentManager.hpp b/src/crepe/ComponentManager.hpp
new file mode 100644
index 0000000..084cd33
--- /dev/null
+++ b/src/crepe/ComponentManager.hpp
@@ -0,0 +1,152 @@
+#pragma once
+
+#include <type_traits>
+
+#include "ComponentManager.h"
+
+namespace crepe {
+
+template <class T, typename... Args>
+void ComponentManager::add_component(uint32_t id, Args &&... args) {
+	using namespace std;
+
+	static_assert(is_base_of<Component, T>::value, "add_component must recieve a derivative class of Component");
+
+	// Determine the type of T (this is used as the key of the unordered_map<>)
+	type_index type = typeid(T);
+
+	// Check if this component type is already in the unordered_map<>
+	if (components.find(type) == components.end()) {
+		//If not, create a new (empty) vector<> of vector<unique_ptr<Component>>
+		components[type] = vector<vector<unique_ptr<Component>>>();
+	}
+
+	// Resize the vector<> if the id is greater than the current size
+	if (id >= components[type].size()) {
+		// Initialize new slots to nullptr (resize does automatically init to nullptr)
+		components[type].resize(id + 1);
+	}
+
+	// Create a new component of type T (arguments directly forwarded). The
+	// constructor must be called by ComponentManager.
+	T * instance = new T(forward<Args>(args)...);
+	// store its unique_ptr in the vector<>
+	components[type][id].push_back(unique_ptr<T>(instance));
+}
+
+template <typename T>
+void ComponentManager::delete_components_by_id(uint32_t id) {
+	using namespace std;
+
+	// Determine the type of T (this is used as the key of the unordered_map<>)
+	type_index type = typeid(T);
+
+	// Find the type (in the unordered_map<>)
+	if (components.find(type) != components.end()) {
+		// Get the correct vector<>
+		vector<vector<unique_ptr<Component>>> & component_array
+			= components[type];
+
+		// Make sure that the id (that we are looking for) is within the boundaries of the vector<>
+		if (id < component_array.size()) {
+			// Clear the whole vector<> of this specific type and id
+			component_array[id].clear();
+		}
+	}
+}
+
+template <typename T>
+void ComponentManager::delete_components() {
+	// 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 (components.find(type) != components.end()) {
+		// Clear the whole vector<> of this specific type
+		components[type].clear();
+	}
+}
+
+template <typename T>
+std::vector<std::reference_wrapper<T>>
+ComponentManager::get_components_by_id(uint32_t id) const {
+	using namespace std;
+
+	// Determine the type of T (this is used as the key of the unordered_map<>)
+	type_index type = typeid(T);
+
+	// Create an empty vector<>
+	vector<reference_wrapper<T>> component_vector;
+
+	// Find the type (in the unordered_map<>)
+	if (components.find(type) != components.end()) {
+		// Get the correct vector<>
+		const vector<vector<unique_ptr<Component>>> & component_array
+			= components.at(type);
+
+		// Make sure that the id (that we are looking for) is within the boundaries of the vector<>
+		if (id < component_array.size()) {
+			// Loop trough the whole vector<>
+			for (const unique_ptr<Component> & component_ptr :
+				 component_array[id]) {
+				// Cast the unique_ptr to a raw pointer
+				T * casted_component = static_cast<T *>(component_ptr.get());
+
+				// Ensure that the cast was successful
+				if (casted_component) {
+					// Add the dereferenced raw pointer to the vector<>
+					component_vector.push_back(*casted_component);
+				}
+			}
+		}
+	}
+
+	// Return the vector<>
+	return component_vector;
+}
+
+template <typename T>
+std::vector<std::reference_wrapper<T>>
+ComponentManager::get_components_by_type() const {
+	using namespace std;
+
+	// Determine the type of T (this is used as the key of the unordered_map<>)
+	type_index type = typeid(T);
+
+	// Create an empty vector<>
+	vector<reference_wrapper<T>> component_vector;
+	// Set the id to 0 (the id will also be stored in the returned vector<>)
+	// uint32_t id = 0;
+
+	// Find the type (in the unordered_map<>)
+	if (components.find(type) != components.end()) {
+
+		// Get the correct vector<>
+		const vector<vector<unique_ptr<Component>>> & component_array
+			= components.at(type);
+
+		// Loop through the whole vector<>
+		for (const vector<unique_ptr<Component>> & component :
+			 component_array) {
+			// Loop trough the whole vector<>
+			for (const unique_ptr<Component> & component_ptr : component) {
+				// Cast the unique_ptr to a raw pointer
+				T * casted_component = static_cast<T *>(component_ptr.get());
+
+				// Ensure that the cast was successful
+				if (casted_component) {
+					// Pair the dereferenced raw pointer and the id and add it to the vector<>
+					component_vector.emplace_back(ref(*casted_component));
+				}
+			}
+
+			// Increase the id (the id will also be stored in the returned vector<>)
+			//++id;
+		}
+	}
+
+	// Return the vector<>
+	return component_vector;
+}
+
+} // namespace crepe