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From: Keith Thompson <kst-u@mib.org>
Newsgroups: comp.lang.ada
Subject: Re: Ada 2012: In-out parameters for functions
Date: Fri, 03 May 2013 17:40:30 -0700
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Date: 2013-05-03T17:40:30-07:00
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anon <anon@anon.org> writes:
[...]
> Since then one or more of Ada maintainers have decided to add number 
> of "C" like syntax and/or coding to Ada. An example is the "conditional 
> statements" another is the the "C" function/procedure call with both 
> having in out parameters.  A number of old "C" compilers ( 1980..1990s 
> from Microsoft and IBM ) allowed the "in out" parameters for C 
> functions.
[...]

Do you have a specific example of a C compiler that supports "in
out" parameters?

The C language itself has always specified pure pass-by-value
for all function parameters.  (No, arrays are not an exception
to that; for details see section 6 of the comp.lang.c FAQ,
<http://www.c-faq.com>.)  Pass-by-reference is easily, though
perhaps a bit clumsily, emulated by passing pointer arguments.
A C compiler certainly *could* support "in out" parameters as an
extension, but I've never heard of one that did.

-- 
Keith Thompson (The_Other_Keith) kst-u@mib.org  <http://www.ghoti.net/~kst>
Working, but not speaking, for JetHead Development, Inc.
"We must do something.  This is something.  Therefore, we must do this."
    -- Antony Jay and Jonathan Lynn, "Yes Minister"