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### 1256. `weak_ptr` comparison functions should be removed

Section: 20.11.4 [util.smartptr.weak] Status: C++11 Submitter: Daniel Krügler Opened: 2009-11-04 Last modified: 2016-01-28

Priority: Not Prioritized

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Discussion:

Additional to the necessary cleanup of the description of the the `weak_ptr` component from 20.11.4 [util.smartptr.weak] described in 1231 it turns out that the currently deleted comparison functions of `weak_ptr` are not needed at all: There is no safe-bool conversion from `weak_ptr`, and it won't silently chose a conversion to `shared_ptr`.

[ 2009-11-14 Moved to Tentatively Ready after 5 positive votes on c++std-lib. ]

Proposed resolution:

Change 20.11.4 [util.smartptr.weak]/1 as indicated:

>     namespace std {
>     template<class T> class weak_ptr {
>     public:
>     ...
>       // comparisons
>       template<class Y> bool operator<(weak_ptr<Y> const&) const = delete;
>       template<class Y> bool operator<=(weak_ptr<Y> const&) const = delete;
>       template<class Y> bool operator>(weak_ptr<Y> const&) const = delete;
>       template<class Y> bool operator>=(weak_ptr<Y> const&) const = delete;
>     };
>     ...