NAME
ggidev-sign_3, ggidev-bits_3, ggidev-eq0_3, ggidev-gt0_3, ggidev-ge0_3,
ggidev-lt0_3, ggidev-le0_3 - triple-int properties
SYNOPSIS
#include <ggi/internal/triple-int.h>
int sign_3(unsigned x[3]);
int bits_3(unsigned x[3]);
int eq0_3(unsigned x[3]);
int gt0_3(unsigned x[3]);
int ge0_3(unsigned x[3]);
int lt0_3(unsigned x[3]);
int le0_3(unsigned x[3]);
DESCRIPTION
sign_3 checks the sign of x.
bits_3 counts the number of significant bits of x. I.e. leading zeros
in a positive value and leading ones in a negative value are not
counted.
eq0_3, gt0_3, ge0_3, lt0_3 and le0_3 tests the relation between x and
zero. eq0_3 tests if x is equal to zero, gt0_3 if x is greater than
zero, ge0_3 if x is greater than or equal to zero, lt0_3 if x is less
than zero and last but not least le0_3 tests if x is less than or equal
to zero.
RETURN VALUE
sign_3 returns -1 for negative values, 0 for zero values and 1 for
positive values.
bits_3 returns 0 for x equal to 0 or -1, 1 for x equal to 1 and -2, 2
for x equal to 2, 3, -3 and -4 etc.
eq0_3, gt0_3, ge0_3, lt0_3 and le0_3 all returns non-zero if the
relation is true, and zero otherwise.
EXAMPLES
Some triple-int tests:
unsigned x[3];
assign_int_3(x, 5);
ASSERT(sign_3(x) == 1);
ASSERT(bits_3(x) == 3);
ASSERT(!eq0_3(x));
ASSERT(gt0_3(x));
ASSERT(ge0_3(x));
ASSERT(!lt0_3(x));
ASSERT(!le0_3(x));
SEE ALSO
ggidev-triple-int(7), ggidev-assign_int_3(3)