cython

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cdef extern from "c-algorithms/src/queue.h":
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    ctypedef struct Queue:
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        pass
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    ctypedef void* QueueValue
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    Queue* queue_new()
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    void queue_free(Queue* queue)
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    int queue_push_head(Queue* queue, QueueValue data)
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    QueueValue  queue_pop_head(Queue* queue)
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    QueueValue queue_peek_head(Queue* queue)
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    int queue_push_tail(Queue* queue, QueueValue data)
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    QueueValue queue_pop_tail(Queue* queue)
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    QueueValue queue_peek_tail(Queue* queue)
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    bint queue_is_empty(Queue* queue)
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