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Section: 99 [auto.ptr] Status: C++11 Submitter: Alisdair Meredith Opened: 2009-10-24 Last modified: 2016-01-28
Priority: Not Prioritized
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Discussion:
This issue is extracted as the ongoing point-of-interest from earlier issue 463.
auto_ptr is overspecified as the auto_ptr_ref implementation detail is formally specified, and the technique is observable so workarounds for compiler defects can cause a working implementation of the primary auto_ptr template become non-conforming.
auto_ptr_ref is a documentation aid to describe a possible mechanism to implement the class. It should be marked exposition only, as per similar classes, e.g., istreambuf_iterator::proxy
[ 2009-10-25 Daniel adds: ]
I wonder, whether the revised wording shouldn't be as straight as for istream_buf by adding one further sentence:
An implementation is permitted to provide equivalent functionality without providing a class with this name.
[ 2009-11-06 Alisdair adds Daniel's suggestion to the proposed wording. ]
[ 2009-11-06 Howard moves issue to Review. ]
[ 2009-11-14 Moved to Tentatively Ready after 5 positive votes on c++std-lib. ]
Proposed resolution:
Add the term "exposition only" in the following two places:
Ammend 99 [auto.ptr]p2:
The exposition only class
Ttemplate auto_ptr_ref holds a reference to an auto_ptr. It is used by the auto_ptr conversions to allow auto_ptr objects to be passed to and returned from functions. An implementation is permitted to provide equivalent functionality without providing a class with this name.namespace std { template <class Y> struct auto_ptr_ref { }; // exposition only