# std::atomic_ref<T>::required_alignment

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< cpp‎ | atomic‎ | atomic ref

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).

### 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.

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