Hi,

A friend of mine informed me of this report

    Lambda expressions and closures for C++
    Jeremiah Willcock, Jaakko Jarvi, Doug Gregor, Bjarne Stroustrup,
Andrew Lumsdaine
    2006-02-26
    http://public.research.att.com/~bs/N1968-lambda-expressions.pdf

and I thought you might be interested.  (I searched a little and
didn't find any discussion on this report in this list.)

A few highlights:

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    We propose to extend the C++ language with lambda expressions, and
define the semantics of these unnamed local functions via translation
to closures: function objects implemented using local classes.

...

    void f() {
      int sum = 0;
      for each(a.begin(), a.end(),
        <>(int x) -> int extern(sum) {return sum += x;});
    }

...

    2.1 Omitting the return type
    The return type of a lambda expression can be omitted if the body
of the lambda function contains at most one return statement.

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Enjoy:-),

        Eijiro