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Implement Complex#<=>

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Implement Complex#<=> so that it is usable as an argument when
calling <=> on objects of other classes (since #coerce will coerce
such numbers to Complex).  If the complex number has a zero imaginary
part, and the other argument is a real number (or complex number with
zero imaginary part), return -1, 0, or 1.  Otherwise, return nil,
indicating the objects are not comparable.

Fixes [Bug #15857]
This commit is contained in:
Jeremy Evans 2019-06-04 21:41:02 -07:00
parent 65944e96d3
commit b9ef35e4c6
5 changed files with 90 additions and 13 deletions
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8
test/ruby/test_complexrational.rb
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@ -102,7 +102,7 @@ class ComplexRational_Test < Test::Unit::TestCase
assert_equal(Complex(SimpleRat(4,3),SimpleRat(1,1)), c * 2)
assert_equal(Complex(SimpleRat(1,3),SimpleRat(1,4)), c / 2)
assert_equal(Complex(SimpleRat(7,36),SimpleRat(2,3)), c ** 2)
assert_raise(NoMethodError){c <=> 2}
assert_nil(c <=> 2)
assert_equal(Complex(SimpleRat(8,3),SimpleRat(1,2)), 2 + c)
assert_equal(Complex(SimpleRat(4,3),SimpleRat(-1,2)), 2 - c)
@ -111,7 +111,7 @@ class ComplexRational_Test < Test::Unit::TestCase
r = 2 ** c
assert_in_delta(1.4940, r.real, 0.001)
assert_in_delta(0.5392, r.imag, 0.001)
assert_raise(NoMethodError){2 <=> c}
assert_nil(2 <=> c)
assert_equal(Complex(SimpleRat(13,6),SimpleRat(5,2)), c + cc)
assert_equal(Complex(SimpleRat(-5,6),SimpleRat(-3,2)), c - cc)
@ -120,7 +120,7 @@ class ComplexRational_Test < Test::Unit::TestCase
r = c ** cc
assert_in_delta(0.1732, r.real, 0.001)
assert_in_delta(0.1186, r.imag, 0.001)
assert_raise(NoMethodError){c <=> cc}
assert_nil(c <=> cc)
assert_equal(Complex(SimpleRat(13,6),SimpleRat(5,2)), cc + c)
assert_equal(Complex(SimpleRat(5,6),SimpleRat(3,2)), cc - c)
@ -129,7 +129,7 @@ class ComplexRational_Test < Test::Unit::TestCase
r = cc ** c
assert_in_delta(0.5498, r.real, 0.001)
assert_in_delta(1.0198, r.imag, 0.001)
assert_raise(NoMethodError){cc <=> c}
assert_nil(cc <=> c)
assert_equal([SimpleRat,SimpleRat],
(+c).instance_eval{[real.class, imag.class]})