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/*

 *  call-seq:

 *     rng.minmax                       -> [obj, obj]

 *     rng.minmax {| a,b | block }      -> [obj, obj]

 *

 *  Returns a two element array which contains the minimum and the

 *  maximum value in the range.

 *

 *  Can be given an optional block to override the default comparison

 *  method <code>a <=> b</code>.

 */

static VALUE

range_minmax(VALUE range)

{

    if (rb_block_given_p()) {

        return rb_call_super(0, NULL);

    }

    return rb_ary_new_from_args(2, range_min(0, NULL, range), range_max(0, NULL, range));

}

    rb_define_method(rb_cRange, "minmax", range_minmax, 0);

  def test_minmax

    assert_equal([1, 2], (1..2).minmax)

    assert_equal([nil, nil], (2..1).minmax)

    assert_equal([1, 1], (1...2).minmax)

    assert_raise(RangeError) { (1..).minmax }

    assert_raise(RangeError) { (1...).minmax }

    assert_equal([1.0, 2.0], (1.0..2.0).minmax)

    assert_equal([nil, nil], (2.0..1.0).minmax)

    assert_raise(TypeError) { (1.0...2.0).minmax }

    assert_raise(TypeError) { (1...1.5).minmax }

    assert_raise(TypeError) { (1.5...2).minmax }

    assert_equal([-0x80000002, -0x80000002], ((-0x80000002)...(-0x80000001)).minmax)

    assert_equal([0, 0], (0..0).minmax)

    assert_equal([nil, nil], (0...0).minmax)

    assert_equal([2, 1], (1..2).minmax{|a, b| b <=> a})

  end