Section: 21.6.4 [ptr.launder] Status: New Submitter: Tony van Eerd Opened: 2016-11-13 Last modified: 2017-03-19
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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.
Priority 3; Nico's upcoming paper P0532 should address this and other issues around launder.
This should be handled post-C++17 by Nico's paper P0600.