std::atomic_ref<T>::required_alignment
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std::atomic_ref
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atomic_ref::required_alignment
static constexpr std::size_t required_alignment = /*implementation-defined*/;
(since C++20)
The value of required_alignment is the required alignment for an object to be referenced by an atomic reference, which is at least alignof(T).
[edit] Notes
Hardware could require that an object to be referenced by an atomic_ref<T> have stricter alignment than other T objects, and whether operations on an atomic_ref are lock-free can depend on the alignment of the referenced object.