<commit_before># queue.pyx

cimport cqueue

cdef class Queue:
    """A queue class for C integer values.

    >>> q = Queue()
    >>> q.append(5)
    >>> q.peek()
    5
    >>> q.pop()
    5
    """
    cdef cqueue.Queue* _c_queue
    def __cinit__(self):
        self._c_queue = cqueue.queue_new()
        if self._c_queue is NULL:
            raise MemoryError()

    def __dealloc__(self):
        if self._c_queue is not NULL:
            cqueue.queue_free(self._c_queue)

    cpdef append(self, int value):
        if not cqueue.queue_push_tail(self._c_queue,
                                      <void*> value):
            raise MemoryError()

    # The `cpdef` feature is obviously not available for the original "extend()"
    # method, as the method signature is incompatible with Python argument
    # types (Python does not have pointers).  However, we can rename
    # the C-ish "extend()" method to e.g. "extend_ints()", and write
    # a new "extend()" method that provides a suitable Python interface by
    # accepting an arbitrary Python iterable.
    cpdef extend(self, values):
        for value in values:
            self.append(value)

    cdef extend_ints(self, int* values, size_t count):
        cdef int value<commit_msg>Add safety cast in queue tutorial code that avoids casting a potentially non-pointer-sized "int" to a "void*".<commit_after># queue.pyx

cimport cqueue

cdef class Queue:
    """A queue class for C integer values.

    >>> q = Queue()
    >>> q.append(5)
    >>> q.peek()
    5
    >>> q.pop()
    5
    """
    cdef cqueue.Queue* _c_queue
    def __cinit__(self):
        self._c_queue = cqueue.queue_new()
        if self._c_queue is NULL:
            raise MemoryError()

    def __dealloc__(self):
        if self._c_queue is not NULL:
            cqueue.queue_free(self._c_queue)

    cpdef append(self, int value):
        if not cqueue.queue_push_tail(self._c_queue,
                                      <void*> <Py_ssize_t> value):
            raise MemoryError()

    # The `cpdef` feature is obviously not available for the original "extend()"
    # method, as the method signature is incompatible with Python argument
    # types (Python does not have pointers).  However, we can rename
    # the C-ish "extend()" method to e.g. "extend_ints()", and write
    # a new "extend()" method that provides a suitable Python interface by
    # accepting an arbitrary Python iterable.
    cpdef extend(self, values):
        for value in values:
            self.append(value)

    cdef extend_ints(self, int* values, size_t count):
        cdef int value
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