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From: gbush@my-deja.com
Subject: Re: nested functions
Date: 1999/06/11
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In article <7jmdcv$a56$1@engnews1.eng.sun.com>,
  clamage@eng.sun.com (Steve Clamage) wrote:
> Consider function pointers:
>
> extern int f(int);
> extern int(fp*)(int);
>
> void g1()
> {
>     int h(int) { ... } // supposing C++ had local functions
>     fp = h;

This must be prohibited. It doesn't make sense to assign local function
pointer to the global variable. Local functions cannot be extern.

> If the calling sequences for g1::h and f are not the same,

There should not be such thing as g1::h. Local functions should be
visible only in the scope where they are defined.

> the code can't work. Either you need a different kind of
> function pointer for local functions, or you extend the
> calling sequence of global functions to match that of local
> functions.

You don't need a different kind of pointer for local functions. You
just don't call them from out of scope.

> Given the amount of complexity, and that you can get many of
> the effects of local functions with function objects or with
> classes in general, adding local functions didn't seem like
> a big win for C++.
There is no "amount of complexity", it works great in Pascal and is
very usefull.

Gene.


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