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Dereferencing pointers in Cython is different than in C. Because the Python language already uses the *args and **kwargs syntax to allow arbitrary positional and keyword arguments and to support function argument unpacking, Cython does not support the *a syntax to dereference a C pointer. Instead, we index into the pointer at location 0 to dereference a pointer in Cython. This syntax also works to dereference a pointer in C, although that’s rare.
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