Comparable#clamp

* compar.c (cmp_clamp): Introduce Comparable#clamp.  [Feature #10594]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55863 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 14 insertions, 0 deletions

diff --git a/test/ruby/test_comparable.rb b/test/ruby/test_comparable.rb
index 7624ef2bd3..f35719a9cb 100644
--- a/test/ruby/test_comparable.rb
+++ b/test/ruby/test_comparable.rb
@@ -76,6 +76,20 @@ class TestComparable < Test::Unit::TestCase
     assert_equal(true, @o.between?(0, 0))
   end
 
+  def test_clamp
+    cmp->(x) do 0 <=> x end
+    assert_equal(1, @o.clamp(1, 2))
+    assert_equal(-1, @o.clamp(-2, -1))
+    assert_equal(0, @o.clamp(-1, 3))
+
+    assert_equal(1, @o.clamp(1, 1))
+    assert_equal(0, @o.clamp(0, 0))
+
+    assert_raise_with_message(ArgumentError, 'min argument must be smaller than max argument') {
+      @o.clamp(2, 1)
+    }
+   end
+
   def test_err
     assert_raise(ArgumentError) { 1.0 < nil }
     assert_raise(ArgumentError) { 1.0 < Object.new }