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From: shap@delrey.sgi.com (Jonathan Shapiro)
Newsgroups: comp.lang.c++
Subject: Re: C++ masquerading as C ... How?
Message-ID: <2541@odin.SGI.COM>
Date: 7 Jan 90 20:59:41 GMT
References: <6170011@hpindda.HP.COM>
Sender: news@odin.SGI.COM
Organization: Silicon Graphics, Inc., Mountain View, CA
Lines: 42

In article <6170011@hpindda.HP.COM> hardin@hpindda.HP.COM (John Hardin) writes:
> Can someone tell me how to make a separately compiled function
> written in C++ look like a normal C function to a program written in
> C?
>
>John Hardin
>Hewlett Packard, Information Networks Division
>hardin%hpindgi@hplabs.hp.com
>----------------------------

There are a couple of strategies.

1. You can declare the function using extern "C":

    extern "C" int froboz(int);

    int froboz(int i)
    {
	    return i;
    }

This has the disadvantage that C++ code that uses it won't get
typesafe linkage.

2. You can declare the function with a slightly different name for c:

    extern "C" int c_froboz(int);

    int froboz(int i)  // c++ version
    {
	    return i;
    }

    int c_froboz(int i) { return froboz(i); }  // C version

Advantage is typesafe linkage for C, but disadvantage is the name is
different.

Hope it helps

Jonathan S. Shapiro
Silicon Graphics, Inc.