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From: kvt@druwy.ATT.COM (TranKV)
Newsgroups: comp.lang.c++
Subject: Re: #define
Message-ID: <8866@drutx.ATT.COM>
Date: 30 May 91 19:14:59 GMT
References: <dgorton.675561128@jupiter.newcastle.edu.au>
Sender: news@drutx.ATT.COM
Reply-To: kvt@druwy.ATT.COM (TranKV)
Distribution: comp
Organization: AT&T, Denver, CO
Lines: 21

In article <dgorton.675561128@jupiter.newcastle.edu.au> dgorton@jupiter.newcastle.edu.au (David Mark Gorton) writes:
>Is there a simple way to have #defines with a variable length parameter list?

Yes. And you had it without knowing it:

>#define DEBUG_PRINT(a) if (debug) cout << a endl

With the above, you can do:

    DEBUG_PRINT(a);
    DEBUG_PRINT(a << b);
    DEBUG_PRINT(a << b << c);
    DEBUG_PRINT(a << b << c << ...);

I think you can do this because cpp doesn't recognize '<<' as special
token. It treats the whole thing in parens as a single parameter.
BTW, at least in cfront 2.X, endl is predefined as '\n'. 

Kim Tran
AT&T Bell Labs
kvt@druwy.att.com