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* object.c (rb_obj_singleton_class): new method

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Kernel#singleton_class.  [ruby-core:21702]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@27022 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
shugo 2010-03-23 09:38:54 +00:00
parent 094d03c5d3
commit a3e10f380a
3 changed files with 50 additions and 0 deletions
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5
ChangeLog
View file

@ -1,3 +1,8 @@
Tue Mar 23 18:35:46 2010 Shugo Maeda <shugo@ruby-lang.org>
* object.c (rb_obj_singleton_class): new method
Kernel#singleton_class. [ruby-core:21702]
Tue Mar 23 01:13:59 2010 Tanaka Akira <akr@fsij.org>
* ext/socket: use rsock_ prefix for internal initialization functions.

24
object.c
View file

@ -162,6 +162,29 @@ rb_obj_class(VALUE obj)
return rb_class_real(CLASS_OF(obj));
}
/*
* call-seq:
* obj.singleton_class => class
*
* Returns the singleton class of <i>obj</i>. This method creates
* a new singleton class if <i>obj</i> does not have it.
*
* If <i>obj</i> is <code>nil</code>, <code>true</code>, or
* <code>false</code>, it returns NilClass, TrueClass, or FalseClass,
* respectively.
* If <i>obj</i> is a Fixnum or a Symbol, it raises a TypeError.
*
* Object.new.singleton_class #=> #<Class:#<Object:0xb7ce1e24>>
* String.singleton_class #=> #<Class:String>
* nil.singleton_class #=> NilClass
*/
static VALUE
rb_obj_singleton_class(VALUE obj)
{
return rb_singleton_class(obj);
}
static void
init_copy(VALUE dest, VALUE obj)
{
@ -2585,6 +2608,7 @@ Init_Object(void)
rb_define_method(rb_mKernel, "<=>", rb_obj_cmp, 1);
rb_define_method(rb_mKernel, "class", rb_obj_class, 0);
rb_define_method(rb_mKernel, "singleton_class", rb_obj_singleton_class, 0);
rb_define_method(rb_mKernel, "clone", rb_obj_clone, 0);
rb_define_method(rb_mKernel, "dup", rb_obj_dup, 0);
rb_define_method(rb_mKernel, "initialize_copy", rb_obj_init_copy, 1);

21
test/ruby/test_object.rb
View file

@ -561,4 +561,25 @@ class TestObject < Test::Unit::TestCase
end
end.call
end
def test_singleton_class
x = Object.new
xs = class << x; self; end
assert_equal(xs, x.singleton_class)
y = Object.new
ys = y.singleton_class
assert_equal(class << y; self; end, ys)
assert_equal(NilClass, nil.singleton_class)
assert_equal(TrueClass, true.singleton_class)
assert_equal(FalseClass, false.singleton_class)
assert_raise(TypeError) do
123.singleton_class
end
assert_raise(TypeError) do
:foo.singleton_class
end
end
end