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Document some invariants for the XLC_ enum.

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These can't be reordered without breaking other code.  Document that and add
some static asserts to ensure that anyone who tries gets build failures.
This commit is contained in:
David Chisnall 2017-09-07 17:51:35 +00:00
parent e881ec1646
commit c0cd38223c
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=323277
1 changed files with 21 additions and 0 deletions
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21
lib/libc/locale/xlocale_private.h
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@ -40,6 +40,14 @@
#include <machine/atomic.h>
#include "setlocale.h"
/**
* The XLC_ values are indexes into the components array. They are defined in
* the same order as the LC_ values in locale.h, but without the LC_ALL zero
* value. Translating from LC_X to XLC_X is done by subtracting one.
*
* Any reordering of this enum should ensure that these invariants are not
* violated.
*/
enum {
XLC_COLLATE = 0,
XLC_CTYPE,
@ -50,6 +58,19 @@ enum {
XLC_LAST
};
_Static_assert(XLC_LAST - XLC_COLLATE == 6, "XLC values should be contiguous");
_Static_assert(XLC_COLLATE == LC_COLLATE - 1,
"XLC_COLLATE doesn't match the LC_COLLATE value.");
_Static_assert(XLC_CTYPE == LC_CTYPE - 1,
"XLC_CTYPE doesn't match the LC_CTYPE value.");
_Static_assert(XLC_MONETARY == LC_MONETARY - 1,
"XLC_MONETARY doesn't match the LC_MONETARY value.");
_Static_assert(XLC_NUMERIC == LC_NUMERIC - 1,
"XLC_NUMERIC doesn't match the LC_NUMERIC value.");
_Static_assert(XLC_TIME == LC_TIME - 1,
"XLC_TIME doesn't match the LC_TIME value.");
_Static_assert(XLC_MESSAGES == LC_MESSAGES - 1,
"XLC_MESSAGES doesn't match the LC_MESSAGES value.");
/**
* Header used for objects that are reference counted. Objects may optionally