If you only need few fixed sizes of such a structure, I'd look at making classes with uniformly named slots including one size slot to store the size. You'll need to declare a separate class for each size (number of slots). Define a cdecl function to access slots by index.
Access performance will probably be not as great as with plain address arithmetics of a C array, but you'll be sure that there's only so many slots and none more.
If you only need few fixed sizes of such a structure, I'd look at making classes with uniformly named __slots__, including one size slot to store the size. You'll need to declare a separate class for each size (number of slots). Define a cdecl function to access slots by index.
Access performance will probably be not as great as with plain address arithmetics of a C array, but you'll be sure that there's only so many slots and none more.
Class TrieNode(): def __init__(self, length = 32): self. Members = list() self. Length = length for I in range(length): self.members.
Append(None) def set(self, idx, item): if idx = 0: self. Membersidx = item else: print "ERROR: Specified index out of range." # Alternately, you could raise an IndexError. Def unset(self, idx): if idx = 0: self.
Membersidx = None else: raise IndexError("Specified index out of range (0..%d)." % self. Length).
My preference is assert 0 Lott Jan 29 at 0:03 Sorry, but this isn't even in the right ballpark of what I'm looking for. Two things: 1) I was looking for a way to do this in cython to create a C extension. 2) I don't have any way to force the list to take up exactly 32 elements.It has a len of 32, but usually more space is allocated to make appending easier.
– Jason Baker Jan 29 at 0:33.
I don't know about the best solution, but here's a solution: from cpython. Ref cimport PyObject, Py_XINCREF, Py_XDECREF DEF SIZE = 32 cdef class TrieNode: cdef PyObject *membersSIZE def __cinit__(self): cdef object temp_object for I in range(SIZE): temp_object = int(i) # increment its refcount so it's not gc'd. # We hold a reference to the object and are responsible for # decref-ing it in __dealloc__.
Py_XINCREF(temp_object) self. Membersi = temp_object def __init__(self): # just to show that it works... for I in range(SIZE): print self. Membersi def __dealloc__(self): # make sure we decref the members elements.
For I in range(SIZE): Py_XDECREF(self. Membersi) self. Membersi = NULL A Cython object is an automatically refcounted PyObject *.
You can always roll your own arrays of PyObject *'s as long as you take responsibility for refcounting the little buggers. This can be a major headache for non-trivial cases.
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