Starting the game loop

lib/wal/sources/Scene/SceneManager.cpp

@@ -20,6 +20,8 @@ namespace WAL
 
 	Scene &SceneManager::getCurrent()
 	{
+		if (this->_scenes.empty())
+			throw NotFoundError("No scene exists.");
 		return this->_scenes.front();
 	}
 

lib/wal/sources/Wal.cpp

@@ -2,6 +2,7 @@
 // Created by Zoe Roux on 2021-05-14.
 //
 
+#include <chrono>
 #include "Wal.hpp"
 
 namespace WAL
@@ -14,6 +15,13 @@ namespace WAL
 
 	void WAL::run()
 	{
+		auto lastTick = std::chrono::steady_clock::now();
 
+		while (!this->_shouldClose) {
+			auto now = std::chrono::steady_clock::now();
+			auto dtime = now - lastTick;
+			lastTick = now;
+			// see https://gist.github.com/mariobadr/673bbd5545242fcf9482
+		}
 	}
 }

lib/wal/sources/Wal.hpp

@@ -29,6 +29,8 @@ namespace WAL
 		std::vector<std::unique_ptr<System>> _systems = {};
 		//! @brief The renderer used to draw entities
 		std::unique_ptr<Renderer> _renderer;
+		//! @brief True if the engine should close after the end of the current tick.
+		bool _shouldClose = false;
 	public:
 		//! @brief Create a new system in place.
 		//! @return The wal instance used to call this function is returned. This allow method chaining.