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2942. LWG 2873's resolution missed weak_ptr::owner_before

Section: 20.3.2.3.6 [util.smartptr.weak.obs] Status: C++20 Submitter: Tim Song Opened: 2017-03-09 Last modified: 2021-02-25

Priority: Not Prioritized

View all other issues in [util.smartptr.weak.obs].

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Discussion:

The NB comment asked for noexcept on shared_ptr::owner_before, weak_ptr::owner_before, and owner_less::operator(), but the PR of LWG 2873 only added it to the first and the third one.

[2017-06-03, Moved to Tentatively Ready after 6 positive votes on c++std-lib]

Proposed resolution:

This wording is relative to N4659.

1. Edit 20.3.2.3 [util.smartptr.weak], class template weak_ptr synopsis, as indicated:

   […]
   // 20.3.2.3.6 [util.smartptr.weak.obs], observers
   […]
   template<class U> bool owner_before(const shared_ptr<U>& b) const noexcept;
   template<class U> bool owner_before(const weak_ptr<U>& b) const noexcept;
   

2. Edit 20.3.2.3.6 [util.smartptr.weak.obs] immediately before p4 as indicated:

   template<class U> bool owner_before(const shared_ptr<U>& b) const noexcept;
   template<class U> bool owner_before(const weak_ptr<U>& b) const noexcept;
   

   -4- Returns: An unspecified value such that […]