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Showing content from https://cplusplus.github.io/LWG/issue1026 below:

Smart pointers need to be concept-constrained templates

This page is a snapshot from the LWG issues list, see the Library Active Issues List for more information and the meaning of NAD Concepts status.

Section: 20.2 [memory] Status: NAD Concepts Submitter: Alisdair Meredith Opened: 2009-03-11 Last modified: 2016-01-28

Priority: Not Prioritized

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Discussion:

Addresses UK 209 [CD1]

Smart pointers cannot be used in constrained templates.

[ Summit: ]

We look forward to a paper on this topic. We recommend no action until a paper is available. We understand that a paper is forthcoming.

[ Peter Dimov adds: ]

shared_ptr<T> and weak_ptr<T> support all types T for which T* is valid. In other words, a possible (partial) resolution is to change class T to PointeeType T for shared_ptr, weak_ptr and possibly enable_shared_from_this.

Proposed resolution:

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