Changed some parameters to const-refs

RayTracer/tools/Threadpool.cpp

@@ -18,10 +18,10 @@ Threadpool::~Threadpool() {
 	alive = false;
 	cv.notify_all();
 
-	for (auto &thread : threads) thread.join();
+	for (auto& thread : threads) thread.join();
 }
 
-void Threadpool::queueTask(std::function<void(void)> task) {
+void Threadpool::queueTask(const std::function<void(void)>& task) {
 	std::unique_lock<std::mutex> lock(m);
 	q.emplace(task);
 	lock.unlock();

RayTracer/tools/Threadpool.h

@@ -13,7 +13,7 @@ class Threadpool {
 	Threadpool(size_t n);
 	~Threadpool();
 	// Add a task to the queue
-	void queueTask(std::function<void(void)> task);
+	void queueTask(const std::function<void(void)>& task);
 
    private:
 	void threading();

RayTracer/tools/Transformation.cpp

 #include "Transformation.h"
 
 namespace util {
-util::Transformation::Transformation(Mat4 matrix)
+util::Transformation::Transformation(const Mat4& matrix)
     : toWorld(matrix),
       fromWorld(matrix.invertFull()),
       toWorldN(matrix.invertFull().transpose()) {

RayTracer/tools/Transformation.h

@@ -4,7 +4,7 @@
 namespace util {
 class Transformation {
    public:
-	Transformation(Mat4 matrix);
+	Transformation(const Mat4& matrix);
 	const Mat4 toWorld, fromWorld, toWorldN;
 };
 }  // namespace util
\ No newline at end of file