still deciding on structure

src/App.cpp

@@ -0,0 +1,31 @@
+#include "App.h"
+
+App* App::instance = nullptr;
+
+App::App() {
+
+    if(instance != nullptr) {
+        std::cout << "App already exists\nThere can only be one!\n";
+        std::abort();
+    }
+
+    std::cout << "Initializing...\n";
+
+    instance = this;
+
+}
+
+App::~App() {
+
+    std::cout << "\nExiting...";
+}
+
+void App::run() {
+    std::cout << "\nTesting...\n";
+
+    // Main loop
+    while (!done) {
+        end();
+    }
+}
+