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2489.mem_fn() should be noexcept
Section: 22.10.16 [func.memfn] Status: C++17 Submitter: Stephan T. Lavavej Opened: 2015-03-27 Last modified: 2017-07-30
Priority: 0
View all other issues in [func.memfn].
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Discussion:
mem_fn() is wide contract and doesn't do anything that could throw exceptions, so it should be marked noexcept.
mem_fn() is perfectly happy to wrap a null PMF/PMD, it just can't be invoked later. This is exactly like std::function, which can be constructed from null PMFs/PMDs. Therefore, mem_fn() will remain wide contract forever.
[2015-05, Lenexa]
Move to Immediate.
Proposed resolution:
This wording is relative to N4296.
Change 22.10 [function.objects] p2 "Header <functional> synopsis" as depicted:
[…] // 20.9.11, member function adaptors: template<class R, class T> unspecified mem_fn(R T::*) noexcept; […]
Change 22.10.16 [func.memfn] as depicted:
template<class R, class T> unspecified mem_fn(R T::* pm) noexcept;[…]
-4- Throws: Nothing.
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