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-rw-r--r--include/ruby/internal/intern/class.h20
1 files changed, 16 insertions, 4 deletions
diff --git a/include/ruby/internal/intern/class.h b/include/ruby/internal/intern/class.h
index 2181ab93c7..357af5d176 100644
--- a/include/ruby/internal/intern/class.h
+++ b/include/ruby/internal/intern/class.h
@@ -88,8 +88,8 @@ VALUE rb_define_class_id(ID id, VALUE super);
* @post `outer::id` refers the returned class.
* @note If a class named `id` is already defined and its superclass is
* `super`, the function just returns the defined class.
- * @note The compaction GC does not move classes returned by this
- * function.
+ * @note The GC does not collect nor move classes returned by this
+ * function. They are immortal.
*/
VALUE rb_define_class_id_under(VALUE outer, ID id, VALUE super);
@@ -127,8 +127,8 @@ VALUE rb_define_module_id(ID id);
* constant is not a module.
* @return The created module.
* @post `outer::id` refers the returned module.
- * @note The compaction GC does not move classes returned by this
- * function.
+ * @note The GC does not collect nor move classes returned by this
+ * function. They are immortal.
*/
VALUE rb_define_module_id_under(VALUE outer, ID id);
@@ -200,6 +200,18 @@ VALUE rb_class_descendants(VALUE klass);
*/
VALUE rb_class_subclasses(VALUE klass);
+
+/**
+ * Returns the attached object for a singleton class.
+ * If the given class is not a singleton class, raises a TypeError.
+ *
+ * @param[in] klass A class.
+ * @return The object which has the singleton class `klass`.
+ *
+ * @internal
+ */
+VALUE rb_class_attached_object(VALUE klass);
+
/**
* Generates an array of symbols, which are the list of method names defined in
* the passed class.