Re: [Boost-users] [lambda] Exploring bind syntax.

From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2008-07-21 12:38:36

AMDG

Robert Jones wrote:
> int main( )
> {
>   typedef std :: vector<S *> Vec;
>   using namespace boost :: lambda;
>
>   boost :: function<int( S * )> fn = bind( & S :: methodOfS, _1 );
>   Vec v;
>   Vec :: iterator match;
>
>   match = find_if( v.begin( ), v.end( ), bind( fn, _1 ) != fn( * 
> v.begin( ) ) ); // OK
>
>   match = find_if( v.begin( ), v.end( ), fn( _1 ) != fn( * v.begin( ) 
> ) ); // Fail
> }
>
> I find the line marked 'OK' compiles, but not the line marked 'Fail'. 
> Isn't the
> very point of Boost.Bind to enable this kind of syntax?

You're talking about boost::lambda::bind, not boost::bind.  They
are not the same thing.

> Is there a better
> way to write it than my 'Fail' line, but which will still compile?

You need to use the 'OK' line.   boost::function doesn't know about 
boost::lambda::bind.

In Christ,
Steven Watanabe