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std::atomic_ref::atomic_ref

atomic_ref() = delete;
 (1) (since C++20) 
explicit atomic_ref( T& obj );
 (2) (since C++20) 
atomic_ref( const atomic_ref& ref ) noexcept;
 (3) (since C++11)

Constructs a new atomic_ref object.

1) The default constructor is deleted; atomic_ref is not DefaultConstructible.
2) Constructs an atomic_ref object referencing the object obj. The behavior is undefined if obj is not aligned to required_alignment.
3) Constructs an atomic_ref object referencing the object referenced by ref.

Parameters

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

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