method

<=>

v2_5_5 - Show latest stable - 0 notes - Class: Rational

<=>(p1) public

Returns -1, 0, or +1 depending on whether rational is less than, equal to, or greater than numeric.

nil is returned if the two values are incomparable.

Rational(2, 3) <=> Rational(2, 3)  #=> 0
Rational(5)    <=> 5               #=> 0
Rational(2, 3) <=> Rational(1, 3)  #=> 1
Rational(1, 3) <=> 1               #=> -1
Rational(1, 3) <=> 0.3             #=> 1

Rational(1, 3) <=> "0.3"           #=> nil

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VALUE
rb_rational_cmp(VALUE self, VALUE other)
{
    if (RB_INTEGER_TYPE_P(other)) {
        {
            get_dat1(self);

            if (dat->den == LONG2FIX(1))
                return rb_int_cmp(dat->num, other); /* c14n */
            other = f_rational_new_bang1(CLASS_OF(self), other);
            goto other_is_rational;
        }
    }
    else if (RB_FLOAT_TYPE_P(other)) {
        return rb_dbl_cmp(nurat_to_double(self), RFLOAT_VALUE(other));
    }
    else if (RB_TYPE_P(other, T_RATIONAL)) {
        other_is_rational:
        {
            VALUE num1, num2;

            get_dat2(self, other);

            if (FIXNUM_P(adat->num) && FIXNUM_P(adat->den) &&
                FIXNUM_P(bdat->num) && FIXNUM_P(bdat->den)) {
                num1 = f_imul(FIX2LONG(adat->num), FIX2LONG(bdat->den));
                num2 = f_imul(FIX2LONG(bdat->num), FIX2LONG(adat->den));
            }
            else {
                num1 = rb_int_mul(adat->num, bdat->den);
                num2 = rb_int_mul(bdat->num, adat->den);
            }
            return rb_int_cmp(rb_int_minus(num1, num2), ZERO);
        }
    }
    else {
        return rb_num_coerce_cmp(self, other, rb_intern("<=>"));
    }
}

<=>

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