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Re: GH replacement proposal and bool datatype
From: |
Nelson H. F. Beebe |
Subject: |
Re: GH replacement proposal and bool datatype |
Date: |
Thu, 22 Apr 2004 08:34:26 -0600 (MDT) |
Dale P. Smith <address@hidden> comments:
>> Istr that the new C standard has a bool type. (Maybe I'm thinking of C++)
>> If it does, shouldn't there be a plan to use that?
Both have bool, and C99 has <stdbool.h>, since the new type is
introduced via macros, unlike C++ where it is a new keyword. From the
1999 ISO C Standard:
>> ...
>> 7.16 Boolean type and values <stdbool.h>
>>
>> 1 The header <stdbool.h> defines four macros.
>> 2 The macro
>> bool
>> expands to _Bool.
>>
>> 3 The remaining three macros are suitable for use in #if preprocessing
>> directives. They
>> are
>> true
>> which expands to the integer constant 1,
>> false
>> which expands to the integer constant 0, and
>> __bool_true_false_are_defined
>> which expands to the integer constant 1.
>>
>> 4 Notwithstanding the provisions of 7.1.3, a program may undefine and
>> perhaps then
>> redefine the macros bool, true, and false.213)
>> ...
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