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2575. [fund.ts.v2] experimental::function::assign should be removed

Section: 4.2 [fund.ts.v2::func.wrap.func] Status: TS Submitter: Tim Song Opened: 2015-12-20 Last modified: 2017-07-30

Priority: 0

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Discussion:

Addresses: fund.ts.v2

Following the lead of LWG 2385⁽ⁱ⁾, the assign(F&&, const A&) member function template in std::experimental::function makes no sense (it causes undefined behavior unless the allocator passed compares equal to the one already used by *this) and should be removed.

[2016-02, Issues Telecon]

P0; move to Tentatively Ready.

Proposed resolution:

This wording is relative to N4562.

1. Edit 4.2 [fund.ts.v2::func.wrap.func], class template function synopsis, as indicated:

   namespace std {
     namespace experimental {
     inline namespace fundamentals_v2 {
       […]
       template<class R, class... ArgTypes>
       class function<R(ArgTypes...)> {
       public:
         […]
         void swap(function&);
         template<class F, class A> void assign(F&&, const A&);
         […]
       };
       […]
     } // namespace fundamentals_v2
     } // namespace experimental
     […]
   } // namespace std