Title
Redundant specification of non-type typename-specifier
Status
open
Section
17.7 [temp.res]
Submitter
Hubert Tong

Created on 2014-07-17.00:00:00, last changed 2014-07-17.00:00:00.

Messages

Date: 2014-07-17.00:00:00

Paragraphs 3-4 of 17.7 [temp.res] read, in part,

When a qualified-id is intended to refer to a type that is not a member of the current instantiation (17.7.2.1 [temp.dep.type]) and its nested-name-specifier refers to a dependent type, it shall be prefixed by the keyword typename, forming a typename-specifier. If the qualified-id in a typename-specifier does not denote a type, the program is ill-formed.

If a specialization of a template is instantiated for a set of template-arguments such that the qualified-id prefixed by typename does not denote a type, the specialization is ill-formed.

The former requirement is intended to apply to the definition and the latter to an instantiation of a template, but that intent is not completely clear, leading to the perception that they are redundant.

History
Date User Action Args
2014-07-17 00:00:00admincreate