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2411.shared_ptr is only contextually convertible to bool
Section: 20.3.2.2 [util.smartptr.shared] Status: C++17 Submitter: Jonathan Wakely Opened: 2014-06-21 Last modified: 2017-07-30
Priority: 0
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Discussion:
N3920 made this edit, which is correct but unrelated to the support for arrays:
Change 20.7.2.2 [util.smartptr.shared] p2 as follows:
Specializations of
shared_ptrshall beCopyConstructible,CopyAssignable, andLessThanComparable, allowing their use in standard containers. Specializations ofshared_ptrshall be contextually convertible tobool, allowing their use in boolean expressions and declarations in conditions. […]
That change is actually fixing a defect in the current wording and should be applied directly to the working paper, not just to the Library Fundamentals TS. The declarations of the conversion operator in 20.3.2.2 [util.smartptr.shared] and 20.3.2.2.6 [util.smartptr.shared.obs] are explicit which contradicts the "convertible to bool" statement. The intention is definitely for shared_ptr to only be contextually convertible to bool.
[Urbana 2014-11-07: Move to Ready]
Proposed resolution:
This wording is relative to N3936.
Change 20.3.2.2 [util.smartptr.shared] p2 as indicated:
-2- Specializations of
shared_ptrshall beCopyConstructible,CopyAssignable, andLessThanComparable, allowing their use in standard containers. Specializations ofshared_ptrshall be contextually convertible tobool, allowing their use in boolean expressions and declarations in conditions. The template parameterTofshared_ptrmay be an incomplete type.
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