[Qt-interest] How To: pass extra data to object slots from menu action signals?

[kent williams]

I am working on a program that dynamically adds and removes actions
from menus, based on adding and deleting objects in the user
interface.

This causes a problem in QT -- actions attached to a QMenu send a
triggered() signal, but that signal can only be connected to a slot in
my class with a similar signature, e.g. triggered() or triggered(bool
b).

I figured out that I could use a QSignalMapper to map triggered() from
a menu action to a slot that takes a single string argument.  But what
I'd like to do is pass in two strings. In other words I have a
multilevel menu like this

File
    Save
       Type1
           Object1
           Object2
       Type2
           Object1-1
           Object1-2

And I want to trigger this slot

void SaveSomething(Type, ObjectName);

What I'm asking is this: is there a way to have a Signal send more
information to an object?

The only thing I could figure out is to construct strings containing
both arguments, and then use QSignalMapper to map that Action to that
string.

Is there a better way?