Re: [Boost-users] [Range] and [MemberFunction]

Subject: Re: [Boost-users] [Range] and [MemberFunction]
From: Philipp Moeller (philipp.moeller_at_[hidden])
Date: 2012-03-13 11:36:48

Robert Jones <robertgbjones_at_[hidden]> writes:

> In the documentation of Boost.MemberFunction it suggests that a useful
> purpose
> for it would be to implement overloads of std algorithms, and indeed other
> similar
> algorithms such that the final callable parameter could be a simple pointer
> to member.
>
> struct X { bool method( ); };
>
> std::vector<X> xs;
>
> for_each( xs.begin( ), xs.end( ), & X::method );
>
> or from Boost.Range
>
> boost::for_each( xs, &X::method );
>
> Is such a facility implemented anywhere in Boost?
>
> Where I'm really going with this, is that I'd like to see versions of
> Boost.Range adaptors which
> support the same facility, so I can say, for example
>
> for_each( xs | filtered( & X::method ), doSomething );
>
> rather than, as at present,
>
> for_each ( xs | filtered( bind( & X::method, _1 ) ), doSomething );
>
> and similarly for transformed.
>
> Thanks,
>
> - Rob.

I don't know Boost.MemberFunction and couldn't find any documentation
for it, could you provide a link?

But from what I can gather in your message, boost::mem_fn seems to be
exactly this:

  for_each( xs.begin( ), xs.end( ), boost::mem_fn(& X::method) );

Granted, it is not exactly what you want, but gets very close.

HTH,
Philipp Moeller