I believe the deprecation of QSignalMapper has to do with C++11 lambdas supporting many of it's use-cases, however on my usage of it I currently cannot get rid of it.

My use case introspect QObjects and get their signals and slots on a QMetaMethod, then the meta-method-signals will call the meta-method-slot with an extra value.

I currently cannot connect a QMetaMethod signal to a lambda, is that was possible I could call invoke on the QMetaMethod slot, I somehow think this will be less readable but would cover my use-case.