hash.c: implement Hash#map_v and Hash#map_v!

* hash.c (rb_hash_map_v, rb_hash_map_v_bang): impelement Hash#map_v and
  Hash#map_v! [Feature #12512] [ruby-core:76095]

* test/ruby/test_hash.rb: add tests for above change.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55847 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 21 insertions, 0 deletions

diff --git a/test/ruby/test_hash.rb b/test/ruby/test_hash.rb
index 6a8e7f0423..2b2f154803 100644
--- a/test/ruby/test_hash.rb
+++ b/test/ruby/test_hash.rb
@@ -1415,6 +1415,27 @@ class TestHash < Test::Unit::TestCase
     assert_equal([10, 20, 30], [1, 2, 3].map(&h))
   end
 
+  def test_map_v
+    x = @cls[a: 1, b: 2, c: 3]
+    y = x.map_v {|v| v ** 2 }
+    assert_equal([1, 4, 9], y.values_at(:a, :b, :c))
+    assert_not_same(x, y)
+
+    y = x.map_v.with_index {|v, i| "#{v}.#{i}" }
+    assert_equal(%w(1.0  2.1  3.2), y.values_at(:a, :b, :c))
+  end
+
+  def test_map_v_bang
+    x = @cls[a: 1, b: 2, c: 3]
+    y = x.map_v! {|v| v ** 2 }
+    assert_equal([1, 4, 9], y.values_at(:a, :b, :c))
+    assert_same(x, y)
+
+    x = @cls[a: 1, b: 2, c: 3]
+    y = x.map_v!.with_index {|v, i| "#{v}.#{i}" }
+    assert_equal(%w(1.0  2.1  3.2), y.values_at(:a, :b, :c))
+  end
+
   class TestSubHash < TestHash
     class SubHash < Hash
       def reject(*)