Re: [boost] Report from Berlin C++ Standards Committee meeting

From: David Abrahams (dave_at_[hidden])
Date: 2006-04-13 17:16:36

Bronek Kozicki <brok_at_[hidden]> writes:

> David Abrahams wrote:
>>>> be templated.  I think the syntax should be
>>>>
>>>>   auto(x){ x->first < 0 }
>>> where is "return" ?
>> 
>> Good observation.  Nowhere.  Have you got a problem with that?  Also
>> no semicolon.
>
> it's not function body, then. It's an expression. C'mon, I do not think that 
> this could be honestly called "lambda".

C'mon, haven't you ever heard of something called a "lambda expression?"

Yes, of course it's an expression.  We make a provision that a lambda
expression can end with a simple expression in which case that is its
return value.  It could be made into a statement and a valid function
body like this:

     auto(x) { x->first < 0; }

but then such a statement normally does *not* return, and the
semicolon adds a little confusion, one more character, and nothing of
value.  Adding "return" for the majority of simple lambda expressions
would result in a 25-30% increase in total non-whitespace characters,
which is a big lose.

-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com