Re: [Boost-users] boost lambda weirdness (possible bug?)

From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2008-02-04 13:09:43

AMDG

David Sankel wrote:
> This works:
>
>     const boost::function< void( T const * const) > f =
>         bind( &TVec::push_back, &tVec,
>             bind( constructor<TPtr>(),
>                 bind( &T::clone, _1)));
>
> But this doesn't:
>
>     const boost::function< void( const T & ) > g =
>         bind( &TVec::push_back, &tVec,
>             bind( constructor<TPtr>(),
>                 bind( &T::clone, boost::cref(_1) )));
>
> The compilation error I'm getting is that it cannot create a new
> object of type T and that is expected since T is abstract. Why would
> lambda be making copies instead of passing on the reference?
>
> I've attached a simplified version of the problem.
>   

There is no need to wrap _1 in cref.  Boost.Lambda will pass the 
arguments by
reference anyway.

In Christ,
Steven Watanabe