Non-blocking screenshots with SFML

screenshot.cpp

#include <SFML/Graphics.hpp>
#include <thread>

int main()
{
    sf::RenderWindow window({1920, 1080}, "Screenshot!");
    sf::Texture tex;
    tex.create(1920, 1080);
    sf::Clock cl;

    while(window.isOpen())
    {
        sf::Time dt = cl.restart();
        window.setTitle(std::to_string(1.f/dt.asSeconds()));

        sf::Event event;
        while(window.pollEvent(event))
        {
            if(event.type == sf::Event::Closed)
                window.close();
            else if(event.type == sf::Event::KeyPressed)
            {
                tex.update(window);
                sf::Image img = tex.copyToImage();
                std::thread t([img]() {
                                img.saveToFile("test.png");
                             });
                t.detach();
            }
        }

        window.clear(sf::Color(0xFF0000FF));
        window.display();
    }
}