/**
* Throws an exception if the specified widget can not be used as a parent for the receiver.
*
* @exception IllegalArgumentException
* <ul>
* <li>ERROR_NULL_ARGUMENT - if the parent is null
* <li>ERROR_INVALID_ARGUMENT - if the parent is disposed
* </ul>
*
* @exception SWTException
* <ul>
* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent
* </ul>
*/
void checkParent(Shell parent) {
if (parent == null) error(SWT.ERROR_NULL_ARGUMENT);
parent.checkWidget();
}
