Re: [Boost-users] [bind] Member fn has defeated me

From: Peter Dimov (pdimov_at_[hidden])
Date: 2005-10-05 12:41:07

BRIDGES Dick wrote:

>> BRIDGES Dick wrote:
>>
>>> class Bar {
>>>  typedef void (*pf)(bool);
>>
>> If you make this
>>
>>     typedef boost::function<void(bool)> pf;
>>
> [snip]
>>
>> then
>>
>>   Bar bar_( boost::bind(&X::f, &x) );
>>
>> should work. But you can't get an oridnary function pointer from
>> boost::bind; a function pointer doesn't have enough state to
>> represent &X::f + &x.
>
> <error_message>

[...]

I omitted too much of the context, sorry ;-) For

struct X

{
  void f(bool b) {}
}

the correct thing would be to use boost::bind(&X::f, &x, _1) so that the 
bool argument from pf (the first input argument is _1 in bind notation) can 
be passed to X::f.