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From: Ian Collins <ian-news@hotmail.com>
Newsgroups: comp.lang.c++
Subject: Re: The or operator and the preprocessor?
Date: Mon, 13 Feb 2012 15:59:15 +1300
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On 02/13/12 03:08 PM, glen herrmannsfeldt wrote:
> error: "or" cannot be used as a macro name as it is an operator in C++
>
> In C, the preprocessor does what its name says, and occurs before
> the compiler sees tokens and reserved words.
>
> Is that not true in C++?
>
> extern "C" {
> #include<stdio.h>
> #define or "hi there!\n"
>     int main() {
>        printf( or );
>     }
> }

The error is valid, "or" is the alternative token for "||" in C++. 
Redefining it is a bad idea.

-- 
Ian Collins