[Development] Proposal: adding overloads to pre-existing member functions is ok as long as not a slot

[Thiago Macieira]

On Monday, 27 July 2026 03:20:07 Pacific Daylight Time Marc Mutz via 
Development wrote:
> The std already forbids taking the address of (any, not just member)
> function, and the solution is to wrap the call in a lambda and pass that
> instead (which may decay to a function pointer, if needed).
> 
> So, yes, we may want to tell users not to take addresses of
> non-signal/non-slot Qt functions, member or not.

The connection mechanism is slightly more efficient when you pass a function 
pointer, member or not, because it can tell what arguments you meant to 
receive. When you pass a functor/lambda, the receiver may itself have 
overloads or may be a template, so we can't do that. That means we can't look 
at the receiver's arguments to do interesting things; instead, we must try 
things and see if they compile.

-- 
Thiago Macieira - thiago.macieira (AT) intel.com
  Principal Engineer - Intel DCG - Platform & Sys. Eng.
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