std::unique_ptr interfering with certain sf::RenderWindow functions? - c++

Question

sf::RenderWindow::getPosition() always returns 0, 0 instead of the correct position when I call it from the same scope in which the window is created.
Here's the example code that reproduces the issue:
#include <iostream>
#include <memory>
#include <SFML/Graphics.hpp>
int main() {
std::unique_ptr<sf::RenderWindow> window_;
window_ = std::unique_ptr<sf::RenderWindow>(
new sf::RenderWindow(sf::VideoMode(800, 600), "asd", sf::Style::Default)
);
window_->setFramerateLimit(30);
window_->setVerticalSyncEnabled(false);
while (window_->isOpen()) {
sf::Event evt;
while (window_->pollEvent(evt)) {
if (evt.type == sf::Event::Closed) { window_->close(); }
}
window_->clear();
window_->display();
}
const sf::Vector2i wpos = window_->getPosition();
std::cout << "window position: " << wpos.x << "/" << wpos.y <<std::endl;
return 0;
}
The thing is: I have for example a class MainMenu to which I pass a sf::RenderWindow * (with window_.get()).
When I call window_->getPosition() from MainMenu it reports the correct position, so getPosition() itself is not faulty. It's only wrong when I call it from within the same scope (in main).
I'm using SFML 2.3.1 by the way

Answer 1

You are printing the window position after a loop on while (window_->isOpen()). This means the window is closed, i.e. it does not exist when you call getPosition(). Therefore it is no surprise that the window position is not reported "correctly," because the window has already been closed (permanently, so it has no position).