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std::atomic_flag:: operator=

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std::atomic_flag
Definido en el encabezado <atomic>
atomic_flag & operator = ( const atomic_flag & ) = delete ;
(1) (desde C++11)
atomic_flag & operator = ( const atomic_flag & ) volatile = delete ;
(2) (desde C++11)

std::atomic_flag no es asignable, sus operadores de asignación están eliminados.