Function gets called multiple times

Question

So, inside the game loop function that tracks user input is called multiple times. I guess this happens because game loop goes like 40 iterations each second and if I hold down the key for a 0.5 second, function gets called 20 times. I tried to handle this with sfml events too but it didn't work window.setKeyRepeatEnabled(false). How can I solve this?

//this gets called 20-30times
if (sf::Keyboard::isKeyPressed(sf::Keyboard::Left))
{
    leftPlayerPoints++;
}

Answer 1

Use two boolean flags: One for checking if the key is pressed or not, and one that is used to check if the action have happened yet.

In short something like

if (key_is_pressed)
{
    if (!action_have_happened)
    {
        // Perform action...
        action_have_happened = true;
    }
    // Else: Action have already happened this key-press, don't do it again
}

When the key is released reset both flags (to false).