A simple to use, self-containing FPS meter for SFML programs I use for testing

fpsmeter.cpp

/*
  Usage:

  * Load a font, if you don't have one yet
  * Create the `FpsMeter` object
  * Optional: Set a position
  * Draw the meter

    sf::Font font;
    font.loadFromFile("myfont.ttf");
    FpsMeter fps(font);
    fps.setPosition(20, 10);
    
    window.draw(fps);
*/

class FpsMeter : public sf::Drawable, public sf::Transformable {
private:
    mutable sf::Clock mTimer;
    mutable unsigned int mCounter;
    mutable sf::Text mText;
public:
    FpsMeter(const sf::Font &font) : mCounter(0), mText("", font, 20) {
        mText.setFillColor(sf::Color::White);
    }
    virtual void draw(sf::RenderTarget &target, sf::RenderStates states) const {
        ++mCounter;
        if (mTimer.getElapsedTime() > sf::seconds(1)) {
            mTimer.restart();
            std::stringstream str;
            str << mCounter;
            mText.setString(str.str());
            mCounter = 0;
        }
        states.transform *= getTransform();
        target.draw(mText, states);
    }
};