[boost] Re: First lambda

From: Jonathan Turkanis (technews_at_[hidden])
Date: 2004-03-03 22:17:42

"Shannon Stewman" <stew_at_[hidden]> wrote in message
news:20040304025205.GD832_at_uchicago.edu...
> On Wed, Mar 03, 2004 at 01:34:50PM -0800, Powell, Gary wrote:
>
> > unsigned long n = std::accumulate(
> >       xs.begin(), xs.end(), 0UL,
> >           long (long lhs, X const &rhs)     // inline fn with no
name.
> >           {
> >               return lhs + rhs.count;
> >           }
> >       );
>
> This seems to cast out the type inference present in BLL.  I think
> that's one of the nicer concepts in the lambda library, and a real
> boon to programming.  In my limited experience with SML/OCaml, type
> inference seems a better, safer, and more convenient way to program,
> albeit requiring a lot more compiler intelligence.  As BLL shows,
though,
> this is quite possible, though perhaps limited, with existing C++.
>

How about:

    unsigned long n = std::accumulate(
          xs.begin(), xs.end(), 0UL,
              auto(long lhs, const auto& rhs)     // inline fn with no
name.
              {
                  return lhs + rhs.count;
              }
          );

?

Jonathan