and_then and_then and_then and_then conjunction disjunction disjunction disjunction disjunction disjunction disjunction disjunction disjunction emplace has_value map map map map map_or map_or map_or map_or map_or_else map_or_else map_or_else map_or_else operator bool operator* operator* operator-> operator-> operator= operator= operator= operator= optional optional optional optional optional optional or_else or_else or_else or_else or_else or_else or_else or_else reset swap take take take take value value value_or value_or ~optional

operator=() [3/4] template<class T > template<class U = T, detail::enable_if_t<!detail::is_optional< detail::decay_t< U >>::value > * = nullptr> __thrust_exec_check_disable__ __host__ __device__ optional& thrust::optional< T & >::operator= ( U &&  u ) Rebinds this optional to u. U must be an lvalue reference. optional &operator=(U &&u); References thrust::addressof().