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from cython.cimports.cpython.mem import PyMem_Malloc, PyMem_Realloc, PyMem_Free
@cython.cclass
class SomeMemory:
data: cython.p_double
def __cinit__(self, number: cython.size_t):
# allocate some memory (uninitialised, may contain arbitrary data)
self.data = cython.cast(cython.p_double, PyMem_Malloc(
number * cython.sizeof(cython.double)))
if not self.data:
raise MemoryError()
def resize(self, new_number: cython.size_t):
# Allocates new_number * sizeof(double) bytes,
# preserving the current content and making a best-effort to
# re-use the original data location.
mem = cython.cast(cython.p_double, PyMem_Realloc(
self.data, new_number * cython.sizeof(cython.double)))
if not mem:
raise MemoryError()
# Only overwrite the pointer if the memory was really reallocated.
# On error (mem is NULL), the originally memory has not been freed.
self.data = mem
def __dealloc__(self):
PyMem_Free(self.data) # no-op if self.data is NULL
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