User can quit manually.

The program doesn't run for a fixed time anymore.
Instead it listens to events and user can quit by closing the window.

src/gamebase.cpp

@@ -3,13 +3,30 @@
 #include "sdlmain.hpp"
 #include <sstream>
 #include <SDL2/SDL.h>
+#include <ciso646>
 
 namespace cloonel {
+	namespace {
+		///---------------------------------------------------------------------
+		///---------------------------------------------------------------------
+		bool DoEvents() {
+			SDL_Event eve;
+			while (SDL_PollEvent(&eve)) {
+				switch (eve.type) {
+				case SDL_QUIT:
+					return true;
+				}
+			}
+			return false;
+		}
+	} //unnamed namespace
+
 	///------------------------------------------------------------------------
 	///------------------------------------------------------------------------
 	GameBase::GameBase (SDLMain* parSdlMain) :
 		m_sdlmain(parSdlMain),
-		m_time0(SDL_GetTicks())
+		m_time0(SDL_GetTicks()),
+		m_wantsToQuit(false)
 	{
 	}
 
@@ -40,6 +57,20 @@ namespace cloonel {
 		OnRender();
 		SDL_RenderPresent(ren);
 
+		m_wantsToQuit = DoEvents();
+
 		return delta;
 	}
+
+	///------------------------------------------------------------------------
+	///------------------------------------------------------------------------
+	bool GameBase::WantsToQuit() const {
+		return m_wantsToQuit or ShouldQuit();
+	}
+
+	///------------------------------------------------------------------------
+	///------------------------------------------------------------------------
+	bool GameBase::ShouldQuit() const {
+		return false;
+	}
 } //namespace cloonel

src/gamebase.hpp

@@ -10,6 +10,7 @@ namespace cloonel {
 	class GameBase {
 	public:
 		float Exec ( void );
+		bool WantsToQuit ( void ) const;
 
 	protected:
 		explicit GameBase ( SDLMain* parSdlMain );
@@ -23,9 +24,11 @@ namespace cloonel {
 	private:
 		virtual void OnRender ( void ) = 0;
 		virtual void OnUpdate ( float parDelta ) = 0;
+		virtual bool ShouldQuit ( void ) const;
 
 		SDLMain* const m_sdlmain;
 		unsigned int m_time0;
+		bool m_wantsToQuit;
 	};
 } //namespace cloonel
 

src/main.cpp

@@ -3,6 +3,7 @@
 #include "game.hpp"
 #include <iostream>
 #include <stdexcept>
+#include <ciso646>
 
 namespace {
 	///-------------------------------------------------------------------------
@@ -12,7 +13,7 @@ namespace {
 		do {
 			const float delta = parGame.Exec();
 			totalElapsed += delta;
-		} while (totalElapsed < 15.0f);
+		} while (not parGame.WantsToQuit());
 	}
 } //unnamed namespace