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new macro 'ispow2'

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This commit is contained in:
Roberto Ierusalimschy 2018-06-15 11:13:45 -03:00
parent aedcfb9414
commit 06127927ff
1 changed files with 7 additions and 1 deletions
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8
llimits.h
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@ -1,5 +1,5 @@
/*
** $Id: llimits.h,v 1.149 2018/01/28 15:13:26 roberto Exp roberto $
** $Id: llimits.h,v 1.150 2018/05/30 14:25:52 roberto Exp roberto $
** Limits, basic types, and some other 'installation-dependent' definitions
** See Copyright Notice in lua.h
*/
@ -59,6 +59,12 @@ typedef signed char ls_byte;
#define log2maxs(t) (sizeof(t) * 8 - 2)
/*
** test whether an unsigned value is a power of 2 (or zero)
*/
#define ispow2(x) (((x) & ((x) - 1)) == 0)
/*
** conversion of pointer to unsigned integer:
** this is for hashing only; there is no problem if the integer