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From: rms@AI.MIT.EDU
Newsgroups: gnu.gcc
Subject: #pragma once
Message-ID: <8910300524.AA11104@sugar-bombs.ai.mit.edu>
Date: 30 Oct 89 05:24:27 GMT
Sender: daemon@tut.cis.ohio-state.edu
Distribution: gnu
Organization: GNUs Not Usenet
Lines: 7

If you want to make sure a file won't be reincluded, you should use
`#pragma once' together with suitable conditionals that would prevent
multiple processing of the header file's contents.  You can't rely on
`#pragma once'--it is just a time-saving hint.

If reinclusion would not cause any problem except for increased
compilation time, then you can use `#pragma once' by itself.