Re: [boost] [bind] virtual function pointer woes

Subject: Re: [boost] [bind] virtual function pointer woes
From: Eric Niebler (eric_at_[hidden])
Date: 2009-01-09 12:24:18

Jon Biggar wrote:
> Chris wrote:
>> As far as I know, no.  If you find a true answer, please tell me.
>> I had this problem once as well and looked into it on the 
>> newsgroups.   There may be a non-portable way with the vtable and asm, 
>> but not generally.  My suggestion would be to make a split
>>
>> _nv function that does the call
>>
>> struct B     { virtual void f() { f_nv(); }  void f_nv() 
>> {std::printf("B\n"); } };
>> struct D : B { virtual void f() { f_nv(); } void f_nv() { 
>> std::printf("D\n"); } };
>>
>> And then bind _nv;

This is not an option as the classes B and D are not modifiable.

> Or just create a new free function:
> 
> inline void call_B_f(D &d)
> {
>     d->B::f();
> }
> 
> boost::bind(&call_B_f, _1)(d);

Sure, but I'm going to need a lot of these little functions and it's a 
pain. C++ has what I want (the member function I want to bind to), but 
it's not giving it to me. Very frustrating.

-- 
Eric Niebler
BoostPro Computing
http://www.boostpro.com