std::atomic_ref::atomic_ref (3) Linux Manual Page

std::atomic_ref<T>::atomic_ref – std::atomic_ref<T>::atomic_ref

Synopsis

explicit atomic_ref( T& obj ); (1) (since C++20)
atomic_ref( const atomic_ref& ref ) noexcept; (2) (since C++11)
Constructs a new atomic_ref object.
1) Constructs an atomic_ref object referencing the object obj. The behavior is undefined if obj is not aligned to required_alignment.
2) Constructs an atomic_ref object referencing the object referenced by ref.

Parameters

obj – object to reference
ref – another atomic_ref object to copy from