[boost] Re: [Function] Implemented operator== and operator!=

From: Russell Hind (rhind_at_[hidden])
Date: 2004-01-23 03:30:34

Edward Diener wrote:
> 
> if (ACallback == boost::bind(&X::AMemberFunction,&x))
> {
> // Do something
> }
> else if (ACallback == boost::bind(&Y::AnotherMemberFunction,&y))
> {
> // Do something else
> }
> 

I have wanted this for a while, and ended up with my own 
MethodCallback_c class which just stored an object pointer and method 
address, and allowed compares.  I had an interface class to it, so they 
could be stored generically, but have now replaced this with function<> 
in places where I don't need comparisons.  If boost::function now has == 
then I can stop using the interface class, and just use function<> but 
assign my MethodCallback_c<> class to it rather than a bind if bind 
doesn't support ==.

But agree with your reasoning that if bind is to be the c++ equivelant 
of closures (borland speak) then it should have this capability.  I do 
use this test on __closures in VCL classes and find it useful.

Thanks

Russell