循环队列c++代码

#include <ros/ros.h>
#include <string>
#include <stdlib.h>
#include <iostream>
#include <sys/msg.h>
#include <cstdio>
#include <cstdlib>
#include <sys/types.h>
#include <sys/ipc.h>
#include <unistd.h>

using namespace std;

typedef struct _QUEUE_NODE
{
    int *pData;
    int length;
    int head;
    int tail;
    int count;
}QUEUE_NODE;

QUEUE_NODE* alloca_queue(QUEUE_NODE* pQueue_Node,int number)
{
    if(0 == number)
        return NULL;
    pQueue_Node = (QUEUE_NODE*)malloc(sizeof(QUEUE_NODE));
    memset(pQueue_Node, 0, sizeof(QUEUE_NODE));
    pQueue_Node->pData = (int*)malloc(sizeof(int)*number);
    
    memset(pQueue_Node->pData, 0, sizeof(pQueue_Node->pData));
    if(NULL == pQueue_Node->pData)
    {
        free(pQueue_Node);
        return NULL;
    }
    pQueue_Node->length = number;
    return pQueue_Node;
}

bool delete_queue(const QUEUE_NODE* pQueue_Node)
{
    if(NULL == pQueue_Node)
        return false;
    free(pQueue_Node->pData);
    free((void*)pQueue_Node);
    return true;
}

bool insert_queue(QUEUE_NODE* pQueue_Node, int value)
{
    if(NULL == pQueue_Node)
        return false;

    if(pQueue_Node->length == pQueue_Node->count)
        return false;

    pQueue_Node->pData[pQueue_Node->tail] = value; 
    pQueue_Node->tail = (pQueue_Node->tail + 1) % pQueue_Node->length;
    pQueue_Node->count ++;
    return true;
}

int main(int argc, char **argv)
{
    std::cout<<"test qusetion9 start !"<<std::endl;
    ros::init(argc,argv,"question9_node");
    ros::NodeHandle node;
    ros::Rate r(1);

    QUEUE_NODE* qQueue_node;
    qQueue_node = alloca_queue(qQueue_node,3);
    cout << "size is : " << qQueue_node->length << endl;
    cout << "tail is : " << qQueue_node->tail << endl;
    cout << "head is : " << qQueue_node->head << endl;
    cout << "pData->tail is : " << qQueue_node->pData[qQueue_node->tail] << endl;

    if(insert_queue(qQueue_node,200) == true)
    {
        cout << "size is : " << qQueue_node->length << endl;
        cout << "data is : " << qQueue_node->pData[qQueue_node->tail] << endl;
    }

    if(insert_queue(qQueue_node,300) == true)
    {
        cout << "size is : " << qQueue_node->length << endl;
        cout << "data is : " << qQueue_node->pData[qQueue_node->head+1] << endl;
    }
}