See what an optional-y Window API would look like

Author: ChrisThrasher

src/Mandelbrot.cpp

@@ -86,16 +86,16 @@ int main()
     };
 
     auto window
-        = sf::RenderWindow(sf::VideoMode({ length, length }), "Mandelbrot", sf::Style::Default ^ sf::Style::Resize);
-    window.setFramerateLimit(60);
-    while (window.isOpen()) {
-        while (const std::optional event = window.pollEvent()) {
+        = std::make_optional<sf::RenderWindow>(sf::VideoMode({ length, length }), "Mandelbrot", sf::Style::Default ^ sf::Style::Resize);
+    window->setFramerateLimit(60);
+    while (window) {
+        while (const std::optional event = window->pollEvent()) {
             if (event->is<sf::Event::Closed>()) {
-                window.close();
+                window.reset();
             } else if (const auto* key_pressed = event->getIf<sf::Event::KeyPressed>()) {
                 switch (key_pressed->scancode) {
                 case sf::Keyboard::Scan::Escape:
-                    window.close();
+                    window.reset();
                     break;
                 case sf::Keyboard::Scan::Up:
                     origin = { origin.real(), origin.imag() + extent / 25 };
@@ -139,8 +139,8 @@ int main()
                 recalculate = true;
             } else if (const auto* mouse_button_pressed = event->getIf<sf::Event::MouseButtonPressed>()) {
                 origin += extent
-                    * Complex(double(mouse_button_pressed->position.x) / double(window.getSize().x) - 0.5,
-                              -double(mouse_button_pressed->position.y) / double(window.getSize().y) + 0.5);
+                    * Complex(double(mouse_button_pressed->position.x) / double(window->getSize().x) - 0.5,
+                              -double(mouse_button_pressed->position.y) / double(window->getSize().y) + 0.5);
                 recalculate = true;
             } else if (const auto* mouse_wheel_scrolled = event->getIf<sf::Event::MouseWheelScrolled>()) {
                 if (mouse_wheel_scrolled->delta > 0)
@@ -151,7 +151,7 @@ int main()
             }
         }
 
-        window.clear();
+        window->clear();
 
         if (recalculate) {
             recalculate = false;
@@ -165,9 +165,9 @@ int main()
             texture = sf::Texture::loadFromImage(image).value();
         }
 
-        window.draw(sf::Sprite(*texture));
-        window.draw(text);
-        window.display();
+        window->draw(sf::Sprite(*texture));
+        window->draw(text);
+        window->display();
 
         auto text_builder = std::ostringstream();
         text_builder << std::setw(2) << int(1 / clock.restart().asSeconds()) << " fps\n";