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3160.atomic_ref() = delete; should be deleted
Section: 32.5.7 [atomics.ref.generic] Status: C++20 Submitter: Tim Song Opened: 2018-10-01 Last modified: 2021-02-25
Priority: 0
View all other issues in [atomics.ref.generic].
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Discussion:
atomic_ref has a deleted default constructor, which causes pointless ambiguities in cases like:
void meow(atomic_ref<int>);
void meow(some_default_constructible_struct);
meow({});
It should have no default constructor rather than a deleted one. (Note that it has other user-defined constructors and so cannot be an aggregate under any definition.)
[2018-10-06 Status to Tentatively Ready after seven positive votes on the reflector.]
[2018-11, Adopted in San Diego]
Proposed resolution:
This wording is relative to N4762.
Edit 32.5.7 [atomics.ref.generic], class template atomic_ref synopsis, as indicated:
[…] atomic_ref() = delete; atomic_ref& operator=(const atomic_ref&) = delete; […]
Edit 32.5.7.3 [atomics.ref.int], class template specialization atomic_ref<integral> synopsis, as indicated:
[…] atomic_ref() = delete; atomic_ref& operator=(const atomic_ref&) = delete; […]
Edit 32.5.7.4 [atomics.ref.float], class template specialization atomic_ref<floating-point> synopsis, as indicated:
[…] atomic_ref() = delete; atomic_ref& operator=(const atomic_ref&) = delete; […]
Edit 32.5.7.5 [atomics.ref.pointer], class template specialization atomic_ref<T*> synopsis, as indicated:
[…] atomic_ref() = delete; atomic_ref& operator=(const atomic_ref&) = delete; […]
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