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cdef extern from "folly/Optional.h" namespace "folly" nogil:
    cdef cppclass cOptional "folly::Optional"[T]:
        cOptional()
        cOptional(T val)
        bint has_value()
        T value()
        T value_or(T altValue)
        T* get_pointer()
        void reset()
        void assign(T newValue)

    cOptional[T] make_optional[T](...) except +
