deferred

libcygnet/include/cygnet/util.h

@@ -34,4 +34,13 @@ public:
 template<typename T, void (*Func)(T *)>
 using CPtr = std::unique_ptr<T, CPtrDeleter<T, Func>>;
 
+// Take a function, run it when the object goes out of scope
+template<void (*Func)()>
+class Deferred: NonCopyable {
+public:
+	Deferred() = default;
+	~Deferred() { Func(); }
+};
+
+
 }

libcygnet/samples/hello-triangle/hello-triangle.cc

@@ -18,6 +18,7 @@ const char *fragmentSource = R"(
 
 int main() {
 	SDL_Init(SDL_INIT_VIDEO);
+	Cygnet::Deferred<SDL_Quit> sdl;
 	Cygnet::Window win("Hello Triangle", 640, 480);
 
 	Cygnet::GlShader vertex(vertexSource, Cygnet::GlShader::Type::VERTEX);
@@ -53,5 +54,5 @@ int main() {
 	}
 
 exit:
-	SDL_Quit();
+	return EXIT_SUCCESS;
 }