How to know if game is running in either PIE or Standalone mode?

Development Programming & Scripting C++
6

Bumped into this problem, so I tried to search for how the engine does this internally. And here it is:

// Engine/Source/Editor/TurnkeySupport/Private/TurnkeyEditorSupport.cpp
bool FTurnkeyEditorSupport::IsPIERunning()
{
#if WITH_EDITOR
    return GEditor->PlayWorld != NULL;
#else
    return false;
#endif
}

Unfortunately this is private code in module, but copy paste always works (=

P.S. Just realized OP wanted to rule out Standalone mode as well. The code above only checks PIE. But I’ll leave it here anyway, just in case.