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| author | Rical Jasan <ricaljasan@pacific.net> | 2017-06-20 06:39:27 -0700 |
|---|---|---|
| committer | Rical Jasan <ricaljasan@pacific.net> | 2017-07-27 04:47:42 -0700 |
| commit | d3675d957b9427d4d119250514a25aaba78d26de (patch) | |
| tree | d0da2b89d0b215876ebf42946ad46bf8efe0afef /manual | |
| parent | 88f9e739432dc950b1f28638158d6dbb1ebd0361 (diff) | |
| download | glibc-d3675d957b9427d4d119250514a25aaba78d26de.zip glibc-d3675d957b9427d4d119250514a25aaba78d26de.tar.gz glibc-d3675d957b9427d4d119250514a25aaba78d26de.tar.bz2 | |
manual: Refactor documentation of CHAR_BIT.
This single-@item @table is better defined with @deftypevr, since the
CHAR_BIT macro has @standards (being declared in a header), and @items
in @tables are not considered annotatable. Using @deftypevr
automatically includes the macro in the Variable and Constant Macro
Index and ensures its inclusion the Summary of Library Facilities.
@deftypevr is used to record the type of the macro so that it also
appears in the Summary.
The description is updated to mention a later POSIX requirement that
this macro have the value 8.
* manual/lang.texi (CHAR_BIT): Convert from an @table to an
@deftypevr. Change standard from ISO to C90. Mention the
POSIX.1-2001 requirement of the value 8.
Diffstat (limited to 'manual')
| -rw-r--r-- | manual/lang.texi | 11 |
1 files changed, 5 insertions, 6 deletions
diff --git a/manual/lang.texi b/manual/lang.texi index c4b641d..75af677 100644 --- a/manual/lang.texi +++ b/manual/lang.texi @@ -628,11 +628,10 @@ There is no operator in the C language that can give you the number of bits in an integer data type. But you can compute it from the macro @code{CHAR_BIT}, defined in the header file @file{limits.h}. -@table @code -@item CHAR_BIT -@standards{ISO, limits.h} -This is the number of bits in a @code{char}---eight, on most systems. -The value has type @code{int}. +@deftypevr Macro int CHAR_BIT +@standards{C90, limits.h} +This is the number of bits in a @code{char}. POSIX.1-2001 requires +this to be 8. You can compute the number of bits in any data type @var{type} like this: @@ -640,7 +639,7 @@ this: @smallexample sizeof (@var{type}) * CHAR_BIT @end smallexample -@end table +@end deftypevr That expression includes padding bits as well as value and sign bits. On all systems supported by @theglibc{}, standard integer types other |