deck.slip(...) is a method of class dcpp::shared_deck.
deck.slip(...) starts a duckcpp rendering loop automatically. It has two overloading.
Calling Sig: (overloading-1)
deck.slip();
overloading-1 starts a default rendering loop.
Calling Sig: (overloading-2)
deck.slip([]{});
You can insert some extra code to the rendering loop with overloading-2.
For example:
deck.slip( [&] { auto now = timer->getTime(); } );