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