Mercurial > hg > octave-nkf > gnulib-hg
changeset 4505:b1f54c9110c6
Extend the comment.
author | Bruno Haible <bruno@clisp.org> |
---|---|
date | Tue, 05 Aug 2003 19:29:51 +0000 |
parents | 66dca1409f3e |
children | df8611a33210 |
files | lib/stdbool_.h |
diffstat | 1 files changed, 8 insertions(+), 4 deletions(-) [+] |
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line diff
--- a/lib/stdbool_.h +++ b/lib/stdbool_.h @@ -29,10 +29,14 @@ # undef true #endif -/* For the sake of symbolic names in gdb, define true and false as - enum constants. However, do not define _Bool as the enum type, - since the enum type might be compatible with unsigned int, whereas - _Bool must promote to int. */ +/* For the sake of symbolic names in gdb, we define true and false as + enum constants, not only as macros. + It is tempting to write + typedef enum { false = 0, true = 1 } _Bool; + so that gdb prints values of type 'bool' symbolically. But if we do + this, values of type '_Bool' may promote to 'int' or 'unsigned int' + (see ISO C 99 6.7.2.2.(4)); however, '_Bool' must promote to 'int' + (see ISO C 99 6.3.1.1.(2)). */ #ifndef __cplusplus # if !@HAVE__BOOL@ enum { false = 0, true = 1 };