Re: [Boost-users] [Bind] How do you write it?

Subject: Re: [Boost-users] [Bind] How do you write it?
From: Robert Jones (robertgbjones_at_[hidden])
Date: 2010-03-27 11:39:10

On Sat, Mar 27, 2010 at 3:43 AM, OvermindDL1 <overminddl1_at_[hidden]> wrote:

> C++ type signatures do not see optional parameters, thus, pretend that
> your function does not have a default value:
>
> #include <algorithm>
> #include <vector>
> #include "boost/bind.hpp"
>
> struct A
> {
>    int double_it( int i, int j = 2 ) { return i * j; }
> } a;
>
> std::vector< int > v;
>
> int main( )
> {
>    for ( std::vector< int >::iterator i = v.begin( ); i != v.end( ); ++ i )
>    {
>        a.double_it( * i );
>    }
>
>    // Write it as a for_each/bind
>    std::for_each( v.begin(), v.end(), boost::bind( & A::double_it,
> boost::ref( a ), _1, 2 ) );
> }
>

Excellent, that is genuinely useful info, thanks. I've actually rewritten my
code
to avoid the need for binding with defaulted args, but at least I  now know
how to do it.

- Rob.
-- 
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