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object.c: Kernel#yield_self

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* object.c (rb_obj_yield_self): new method which yields the
  receiver and returns the result.
  [ruby-core:46320] [Feature #6721]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58528 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2017-05-01 07:50:53 +00:00
parent dabaaafd9f
commit cec0668209
3 changed files with 30 additions and 0 deletions
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4
NEWS
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@ -40,6 +40,10 @@ with all sufficient information, see the ChangeLog file or Redmine
* exception message "stream closed" is changed [Bug #13405]
* Kernel
* Kernel#yield_self [Feature #6721]
* Numeric
* Numerical comparison operators (<,<=,>=,>) no longer rescue exceptions

18
object.c
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@ -497,6 +497,23 @@ rb_obj_itself(VALUE obj)
return obj;
}
/*
* call-seq:
* obj.yield_self {|_obj|...} -> an_object
*
* Yields <i>obj</i> and returns the result.
*
* 'my string'.yield_self {|s|s.upcase} #=> "MY STRING"
*
*/
static VALUE
rb_obj_yield_self(VALUE obj)
{
RETURN_ENUMERATOR(obj, 0, 0);
return rb_yield_values2(1, &obj);
}
/* :nodoc: */
VALUE
rb_obj_init_copy(VALUE obj, VALUE orig)
@ -3507,6 +3524,7 @@ InitVM_Object(void)
rb_define_method(rb_mKernel, "clone", rb_obj_clone2, -1);
rb_define_method(rb_mKernel, "dup", rb_obj_dup, 0);
rb_define_method(rb_mKernel, "itself", rb_obj_itself, 0);
rb_define_method(rb_mKernel, "yield_self", rb_obj_yield_self, 0);
rb_define_method(rb_mKernel, "initialize_copy", rb_obj_init_copy, 1);
rb_define_method(rb_mKernel, "initialize_dup", rb_obj_init_dup_clone, 1);
rb_define_method(rb_mKernel, "initialize_clone", rb_obj_init_dup_clone, 1);

8
test/ruby/test_object.rb
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@ -18,6 +18,14 @@ class TestObject < Test::Unit::TestCase
assert_same(object, object.itself, feature6373)
end
def test_yield_self
feature = '[ruby-core:46320] [Feature #6721]'
object = Object.new
assert_same(self, object.yield_self {self}, feature)
assert_same(object, object.yield_self {|x| break x}, feature)
assert_instance_of(Enumerator, object.yield_self)
end
def test_dup
assert_equal 1, 1.dup
assert_equal true, true.dup