Re: [Boost-users] boost::function, pointer to a member function.

Subject: Re: [Boost-users] boost::function, pointer to a member function.
From: Mathias Gaunard (mathias.gaunard_at_[hidden])
Date: 2010-06-11 09:29:05

Mikhail Tatarnikov wrote:
> Hi guys,
> 
> Is there a way to make boost::function to be passed to a function required a 
> pointer to a member function as parameter:
> 
> struct CFoo
> {
> 	int foo1(int){}
> 	int foo2(int, double){}
> };
> 
> int g(int (CFoo::*)(int));
> 
> int main()
> {
>   g(&CFoo::foo1);
> 
>   g(boost::bind(&CFoo::foo2, _1, _2, 666));	// Doesn't compile - 
> boost::bind returns an object instead of function pointer

There is no way to fix this.
g expects a pointer to member function of the class CFoo.

> // The following doesn't compile - can't convert from int (*)(CFoo*, int) to 
> int (CFoo::*)(int)
>   g(boost::function<int (CFoo*, int)>(		
>       boost::bind(&CFoo::foo2, _1, _2, 666)
>     ).target<int (CFoo*, int)>()
>   )
> }

I believe there are some compilers where you can do evil ugly hacks so 
that you can make a function taking a pointer to an object and n other 
arguments pretend to be a member function taking n arguments.

Otherwise there is no solution but to change g.