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from libcpp cimport bool
cdef extern from "<optional>" namespace "std" nogil:
cdef cppclass nullopt_t:
nullopt_t()
cdef nullopt_t nullopt
cdef cppclass optional[T]:
ctypedef T value_type
optional()
optional(nullopt_t)
optional(optional&) except +
optional(T&) except +
bool has_value()
T& value()
T& value_or[U](U& default_value)
void swap(optional&)
void reset()
T& emplace(...)
T& operator*()
#T* operator->() # Not Supported
optional& operator=(optional&)
optional& operator=[U](U&)
bool operator bool()
bool operator!()
bool operator==[U](optional&, U&)
bool operator!=[U](optional&, U&)
bool operator<[U](optional&, U&)
bool operator>[U](optional&, U&)
bool operator<=[U](optional&, U&)
bool operator>=[U](optional&, U&)
optional[T] make_optional[T](...) except +
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