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

optional() [4/4] 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__ constexpr thrust::optional< T & >::optional ( U &&  u ) Constructs the stored value with u. template <class u="T"> constexpr optional(U &&u); References thrust::addressof().