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authorRical Jasan <ricaljasan@pacific.net>2017-06-20 06:39:27 -0700
committerRical Jasan <ricaljasan@pacific.net>2017-07-27 04:47:42 -0700
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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.texi11
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