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

Section: 20.11.4.6 [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 20.11.4 [util.smartptr.weak], class template `weak_ptr` synopsis, as indicated:

   >     […]
   >     // 20.11.4.6 [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 20.11.4.6 [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 […]