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/* attribute handling */
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double ag_scan_float(void *obj, char *name, double low, double high, double defval);
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int ag_scan_int(void *obj, char *name, int low, int high, int defval);
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typedef struct Nqueue_s {
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Agnode_t **store,**limit,**head,**tail;
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Nqueue *Nqueue_new(Agraph_t *g);
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void Nqueue_free(Agraph_t *g, Nqueue *q);
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void Nqueue_insert(Nqueue *q, Agnode_t *n);
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Agnode_t *Nqueue_remove(Nqueue *q);