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qom: improve documentation of cast functions

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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-id: 1368188203-3407-2-git-send-email-pbonzini@redhat.com
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Paolo Bonzini 2013-05-10 14:16:35 +02:00 committed by Anthony Liguori
parent f6e136e47a
commit 33bc94eb20
1 changed files with 21 additions and 2 deletions
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23
include/qom/object.h
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@ -612,7 +612,8 @@ Object *object_dynamic_cast(Object *obj, const char *typename);
*
* See object_dynamic_cast() for a description of the parameters of this
* function. The only difference in behavior is that this function asserts
* instead of returning #NULL on failure.
* instead of returning #NULL on failure. This function is not meant to be
* called directly, but only through the wrapper macro OBJECT_CHECK.
*/
Object *object_dynamic_cast_assert(Object *obj, const char *typename);
@ -659,11 +660,29 @@ Type type_register(const TypeInfo *info);
* @klass: The #ObjectClass to attempt to cast.
* @typename: The QOM typename of the class to cast to.
*
* Returns: This function always returns @klass and asserts on failure.
* See object_class_dynamic_cast() for a description of the parameters
* of this function. The only difference in behavior is that this function
* asserts instead of returning #NULL on failure. This function is not
* meant to be called directly, but only through the wrapper macros
* OBJECT_CLASS_CHECK and INTERFACE_CHECK.
*/
ObjectClass *object_class_dynamic_cast_assert(ObjectClass *klass,
const char *typename);
/**
* object_class_dynamic_cast:
* @klass: The #ObjectClass to attempt to cast.
* @typename: The QOM typename of the class to cast to.
*
* Returns: If @typename is a class, this function returns @klass if
* @typename is a subtype of @klass, else returns #NULL.
*
* If @typename is an interface, this function returns the interface
* definition for @klass if @klass implements it unambiguously; #NULL
* is returned if @klass does not implement the interface or if multiple
* classes or interfaces on the hierarchy leading to @klass implement
* it. (FIXME: perhaps this can be detected at type definition time?)
*/
ObjectClass *object_class_dynamic_cast(ObjectClass *klass,
const char *typename);