[APP] Extracted GameApplication::init from run. Made window member.

Added empty (virtual) destructor definition in .cpp to allow class-forwarding RenderWindow accessed via unique_ptr

src/GameApplication.cpp

@@ -7,18 +7,25 @@ GameApplication::GameApplication()
 {
 }
 
-void GameApplication::run()
+GameApplication::~GameApplication()
+{
+}
+
+void GameApplication::init()
 {
     // no aliasing
     sf::ContextSettings settings;
     settings.antialiasingLevel = 0;
 
     // windowed 720p. no resize
-    sf::RenderWindow window(sf::VideoMode(1280, 720), "Game", sf::Style::Close, settings);
+    window = std::make_unique<sf::RenderWindow>(sf::VideoMode(1280, 720), "Game", sf::Style::Close, settings);
 
     // 60 FPS, no vsync
-    window.setFramerateLimit(60);
+    window->setFramerateLimit(60);
+}
 
+void GameApplication::run()
+{
     // grass rectangle (goes beyond the bottom of the screen on start to allow camera motion on Y)
     sf::RectangleShape grass({1280.f, 400.f});
     grass.setFillColor(sf::Color::Green);
@@ -33,7 +40,7 @@ void GameApplication::run()
     sf::Clock clock;
     sf::Time time;
 
-    while (window.isOpen())
+    while (window->isOpen())
     {
         // Time check
         sf::Time elapsedTime = clock.restart();
@@ -45,26 +52,26 @@ void GameApplication::run()
 
         // Event handling
         sf::Event event;
-        while (window.pollEvent(event))
+        while (window->pollEvent(event))
         {
             if (event.type == sf::Event::Closed ||
                 (event.type == sf::Event::KeyPressed && event.key.code == sf::Keyboard::Escape))
             {
-                window.close();
+                window->close();
             }
         }
 
         // move camera
         view.move(0.f, std::sin(time.asSeconds()) * 50.f * elapsedTime.asSeconds());
 
         // clear sky
-        window.clear(sf::Color::Cyan);
+        window->clear(sf::Color::Cyan);
 
         // show grass with moving camera
-        window.setView(view);
-        window.draw(grass);
+        window->setView(view);
+        window->draw(grass);
 
         // flip
-        window.display();
+        window->display();
     }
 }

src/GameApplication.h

@@ -1,14 +1,32 @@
 #pragma once
 
+#include <memory>
+
+namespace sf
+{
+    class RenderWindow;
+}
+
 /// Game Application. Handles game loop.
 class GameApplication
 {
 public:
     GameApplication();
+    virtual ~GameApplication();
 
     GameApplication(const GameApplication&) = delete;
     GameApplication& operator=(const GameApplication&) = delete;
 
 public:
+    /// Initialize game application.
+    void init();
+
+    /// Run game loop. Returns when the loop is over, i.e. the window is closed.
     void run();
+
+private:
+    /* State */
+
+    /// Render window
+    std::unique_ptr<sf::RenderWindow> window;
 };

src/main.cpp

@@ -3,6 +3,7 @@
 int main(int argc, char const *argv[])
 {
     GameApplication gameApp;
+    gameApp.init();
     gameApp.run();
 
     return 0;