This page is a snapshot from the LWG issues list, see the Library Active Issues List for more information and the meaning of Resolved status.

2821. std::launder() should be marked as [[nodiscard]]

Section: 17.6.5 [ptr.launder] Status: Resolved Submitter: Tony van Eerd Opened: 2016-11-13 Last modified: 2020-09-06

Priority: 3

View all other issues in [ptr.launder].

View all issues with Resolved status.

Discussion:

As pointed out by Nevin: A use of std::launder that does not make use of its return value is always pointless; the function has no side effects.

[2017-01-27 Telecon]

Priority 3; Nico's upcoming paper P0532 should address this and other issues around launder.

[2017-03-04, Kona]

This should be handled post-C++17 by Nico's paper P0600.

[2017-11-11, Albuquerque]

This was resolved by the adoption of P0600R1.

Proposed resolution: