From: Boon van der RJ <rjvdboon AT cs DOT vu DOT nl>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Some questions, and some bugs (perhaps)
Date: 23 Oct 1998 11:18:59 GMT
Organization: Fac. Wiskunde & Informatica, VU, Amsterdam
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Mike Ruskai <thanny AT spambegone DOT home DOT com> wrote:
> On Thu, 22 Oct 1998 21:05:22 +0100, D. Vrabel wrote:
>>false and true are keywords in C++ (I asume your talking about C++).  Use
>>the bool type for boolean variables.
> Since when?  They aren't in the other two compilers, which is what makes the
> above necessary.

Then the other two are not adhering to the (upcoming?) standards. The
Dec 1996 C++-draft already stated (see below)

gcc has done this since 2.7.x (i think, 2.6.3 didn't follow the draft
AFAIK. Was there a draft back then?)

It's easy to work around. Use
#if ! (defined( __GNUC__) && defined(__cplusplus))
enum bool {false=0, true=1};
#endif
and use bool throughout your code.

==== quote from draft: ====
2.11  Keywords                                               [lex.key]
1 The identifiers shown in Table 3 are  reserved  for  use  as  keywords
  (that is, they are unconditionally treated as keywords in phase 7):

                          Table 3--keywords
+-----------------------------------------------------------------------+
|asm          do             inline             short         typeid    |
|auto         double         int                signed        typename  |
|bool         dynamic_cast   long               sizeof        union     |
|break        else           mutable            static        unsigned  |
|case         enum           namespace          static_cast   using     |
|catch        explicit       new                struct        virtual   |
|char         extern         operator           switch        void      |
|class        false          private            template      volatile  |
|const        float          protected          this          wchar_t   |
|const_cast   for            public             throw         while     |
|continue     friend         register           true                    |
|default      goto           reinterpret_cast   try                     |
|delete       if             return             typedef                 |
+-----------------------------------------------------------------------+
=== end quote from draft ===

See (same draft):
http://www.csci.csusb.edu/dick/c++std/cd2/lex.html#lex.key
http://www.cygnus.com/misc/wp/dec96pub/lex.html#lex.key
http://www.maths.warwick.ac.uk/cpp/pub/wp/html/cd2/lex.html#lex.key

hth,
 Robert.
-- 
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