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Section: 188.8.131.52 [util.smartptr.shared.const] Status: C++11 Submitter: Peter Dimov Opened: 2008-08-30 Last modified: 2016-02-10
Priority: Not Prioritized
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We've changed shared_ptr<Y> to not convert to shared_ptr<T> when Y* doesn't convert to T* by resolving issue 687. This only fixed the converting copy constructor though. N2351 later added move support, and the converting move constructor is not constrained.
[ San Francisco: ]
We might be able to move this to NAD, Editorial once shared_ptr is conceptualized, but we want to revisit this issue to make sure.
[ 2009-07 Frankfurt ]
Moved to Ready.
This issue now represents the favored format for specifying constrained templates.
We need to change the Requires clause of the move constructor:
shared_ptr(shared_ptr&& r); template<class Y> shared_ptr(shared_ptr<Y>&& r);
Requires: For the second constructor Y* shall be convertible to T*.
in order to actually make the example in 687 compile (it now resolves to the move constructor).