Merge branch 'master' of github.com:lonkaars/crepe into jaro/poc-physics

1 files changed, 84 insertions, 0 deletions

diff --git a/mwe/ecs-memory-efficient/inc/ContiguousContainer.hpp b/mwe/ecs-memory-efficient/inc/ContiguousContainer.hpp
new file mode 100644
index 0000000..408d5aa
--- /dev/null
+++ b/mwe/ecs-memory-efficient/inc/ContiguousContainer.hpp
@@ -0,0 +1,84 @@
+template <typename T>
+ContiguousContainer<T>::ContiguousContainer() : mSize(0), mCapacity(10) {
+	// Allocate memory for 10 objects initially
+	mData = static_cast<T *>(malloc(mCapacity * sizeof(T)));
+	if (!mData) {
+		throw std::bad_alloc();
+	}
+}
+
+template <typename T>
+ContiguousContainer<T>::~ContiguousContainer() {
+	// Destroy all constructed objects
+	for (size_t i = 0; i < mSize; ++i) {
+		mData[i].~T();
+	}
+	// Free the allocated memory
+	free(mData);
+}
+
+template <typename T>
+template <typename... Args>
+void ContiguousContainer<T>::pushBack(Args &&... args) {
+	if (mSize == mCapacity) {
+		// Double the capacity if the container is full
+		resize(mCapacity * 2);
+	}
+	// Use placement new with perfect forwarding to construct the object in place
+	new (mData + mSize) T(std::forward<Args>(args)...);
+	++mSize;
+}
+
+template <typename T>
+void ContiguousContainer<T>::popBack() {
+	if (mSize > 0) {
+		--mSize;
+		// Explicitly call the destructor
+		mData[mSize].~T();
+	}
+}
+
+template <typename T>
+T & ContiguousContainer<T>::operator[](size_t index) {
+	if (index >= mSize) {
+		throw std::out_of_range("Index out of range");
+	}
+	return mData[index];
+}
+
+template <typename T>
+size_t ContiguousContainer<T>::getSize() const {
+	return mSize;
+}
+
+// Function that returns a vector of references to all stored objects
+template <typename T>
+std::vector<std::reference_wrapper<T>>
+ContiguousContainer<T>::getAllReferences() {
+	std::vector<std::reference_wrapper<T>> references;
+	references.reserve(mSize); // Reserve space to avoid reallocation
+	for (size_t i = 0; i < mSize; ++i) {
+		references.push_back(std::ref(mData[i]));
+	}
+	return references;
+}
+
+template <typename T>
+void ContiguousContainer<T>::resize(size_t new_capacity) {
+	// Allocate new memory block with the updated capacity
+	T * new_data = static_cast<T *>(malloc(new_capacity * sizeof(T)));
+	if (!new_data) {
+		throw std::bad_alloc();
+	}
+
+	// Move or copy existing objects to the new memory block
+	for (size_t i = 0; i < mSize; ++i) {
+		new (new_data + i) T(std::move(mData[i])); // Move the objects
+		mData[i].~T(); // Call the destructor for the old object
+	}
+
+	// Free the old memory block
+	free(mData);
+	mData = new_data;
+	mCapacity = new_capacity;
+}