Are macros expanded within unused macro arguments?

Article View: comp.std.c

Article #4737

#4737

From: Michael Greenberg
Date: Thu, 01 Feb 1996 13:19

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Is the following program legal?

#define foo(unused)
#define bar(x,y)

foo(bar(1))

Excerpt from "6.8.3.1 Argument substitution"

  After the arguments for the invocation of a function-like macro have
  been identified, argument substitution takes place. A parameter in the
  replacment list, ..., is replaced by the corresponding argument after
  all macros contained therein have been expanded. Before being
  substituted, each argument's preprocessing tokens are completely macro
  replaced ... .



--
Michael Greenberg                      email: mgreenberg@scr.siemens.com
Siemens Corporate Research             phone: 609-734-3347
755 College Road East                  fax: 609-734-6565
Princeton, NJ 08540

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Newsgroups: comp.std.c
Path: arc1-ca.pugleaf.net!in2.uu.net!siemens!mlg
From: mlg@scr.siemens.com (Michael Greenberg)
Subject: Are macros expanded within unused macro arguments?
Message-ID: <DM3MC3.Atv@scr.siemens.com>
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Organization: Siemens Corporate Research, Princeton, NJ
Date: Thu, 1 Feb 1996 13:19:14 GMT