method

hash

v1_8_7_330 - Show latest stable - 0 notes - Class: Range

1_8_6_287 (0)
1_8_7_72 (0)
1_8_7_330 (0)
1_9_1_378 (-36)
1_9_2_180 (0)
1_9_3_125 (0)
1_9_3_392 (0)
2_1_10 (28)
2_2_9 (38)
2_4_6 (0)
2_5_5 (0)
2_6_3 (0)
What's this?

hash() public

Generate a hash value such that two ranges with the same start and end points, and the same value for the “exclude end” flag, generate the same hash value.

Show source

/*
 * call-seq:
 *   rng.hash    => fixnum
 *
 * Generate a hash value such that two ranges with the same start and
 * end points, and the same value for the "exclude end" flag, generate
 * the same hash value.
 */

static VALUE
range_hash(range)
    VALUE range;
{
    long hash = EXCL(range);
    VALUE v;

    v = rb_hash(rb_ivar_get(range, id_beg));
    hash ^= v << 1;
    v = rb_hash(rb_ivar_get(range, id_end));
    hash ^= v << 9;
    hash ^= EXCL(range) << 24;

    return LONG2FIX(hash);
}

hash

Related methods