This page is a snapshot from the LWG issues list, see the Library Active Issues List for more information and the meaning of NAD status.
Section: 22.4.7 [tuple.helper] Status: NAD Submitter: Alisdair Meredith Opened: 2009-05-23 Last modified: 2016-01-28
Priority: Not Prioritized
View all other issues in [tuple.helper].
View all issues with NAD status.
Discussion:
The tuple query APIs tuple_size and
tuple_element do not support references-to-tuples. This can be
annoying when a template deduced a parameter type to be a reference,
which must be explicitly stripped with remove_reference before calling
these APIs.
I am not proposing a resolution at this point, as there is a combinatorial explosion with lvalue/rvalue references and cv-qualification (see previous issue) that suggests some higher refactoring is in order. This might be something to kick back over to Core/Evolution.
Note that we have the same problem in numeric_limits.
[ 2009-10 post-Santa Cruz: ]
Move to Open. Alisdair to provide wording.
[ 2010 Rapperswil: ]
Move to NAD. This is an extension after the FCD, without a clear motivation. May consider as NAD Future if motivating examples come forward.
Proposed resolution: