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From: wollman@emily.uvm.edu (Garrett Wollman)
Newsgroups: comp.lang.c
Subject: Re: Embedding macro values in strings
Message-ID: <1991Jan13.000941.23438@uvm.edu>
Date: 13 Jan 91 00:09:41 GMT
References: <1991Jan10.200806.12745@grep.co.uk> <10504@hydra.Helsinki.FI>
Sender: news@uvm.edu
Organization: University of Vermont - EMBA Computing Facility
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Doug Gwyn will probably yell at me...


#define foo_bar(baz) "Line " #baz
#define foo() foo_bar(__LINE__)

I *think* that this will work; I can't remember the exact order of
application here, which was posted by one of the net.c.gurus a while
back.  It will work if the preprocessor expands __LINE__ before it
expands foo_bar().  [I.e., is the C preprocessor a lazy or non-lazy
evaluator?]  Someone might have quotations from the relevant sections
of the Standard?

-GAWollman

Garrett A. Wollman - wollman@emily.uvm.edu

Disclaimer:  I'm not even sure this represents *my* opinion, never
mind UVM's, EMBA's, EMBA-CF's, or indeed anyone else's.