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cdef extern from "<util/generic/maybe.h>" nogil:
    cdef cppclass TNothing:
        pass
    cdef TNothing Nothing()
    cdef cppclass TMaybe[T]:
        TMaybe(...) except +
        TMaybe& operator=(...) except +
        void ConstructInPlace(...) except +
        void Clear() except +
        bint Defined()
        bint Empty()
        void CheckDefined() except +
        T* Get() except +
        T& GetRef() except +
        T GetOrElse(T&) except +
        TMaybe OrElse(TMaybe&) except +
        TMaybe[U] Cast[U]() except +
        void Swap(TMaybe& other) except +
        bint operator ==[U](U&) except +
        bint operator !=[U](U&) except +
        bint operator <[U](U&) except +
        bint operator >[U](U&) except +
        bint operator <=[U](U&) except +
        bint operator >=[U](U&) except +
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