void GLWidget::initializeGL()
{
- static std::once_flag flag;
- std::call_once(flag, [this]{
+ static once_flag flag;
+ call_once(flag, [this]{
global_mixer = new Mixer(QGLFormat::toSurfaceFormat(format()), global_flags.num_cards);
global_mainwindow->mixer_created(global_mixer);
global_mixer->start();