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from cpython cimport array
import array
cdef array.array a = array.array('i', [1, 2, 3])
cdef int[:] ca = a
cdef int overhead(object a):
cdef int[:] ca = a
return ca[0]
cdef int no_overhead(int[:] ca):
return ca[0]
print(overhead(a)) # new memory view will be constructed, overhead
print(no_overhead(ca)) # ca is already a memory view, so no overhead
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