gistfile1.cpp

window::window(unsigned int width, unsigned int height, const std::string& title, bool fullscreen, bool resizable)
      : window_impl_(std::make_unique<window_impl>(width, height, title, fullscreen, resizable)) {
    if (reference_count > 0) throw std::runtime_error("Multiple windows aren't yet supported.");
    ++reference_count;
    current_window.reset(this);
}