VC如何应用STL

下面我们以一个简单的队列应用。来说明

 

 1#include <string>
 2#include <list>
 3
 4//第一步:定义你要用到的结构体
 5typedef struct _QUERY_DATA     //队列的数据
 6{
 7    char data1[3];
 8    char data2[2];
 9}TQueryData,*PQueryData;


//第二步
typedef std::list<TQueryData *> QueryMyList;

CRITICAL_SECTION m_rCriticalSection; //声明临界资源

class QueryMyQueue : public QueryMyList
{

   public:
     QueryReqQueue()
     {
          ::InitializeCriticalSection(&m_rCriticalSection);     //初始化一个临界资源对象
     }
     virtual ~QueryReqQueue() 
     {
          ::DeleteCriticalSection(&m_rCriticalSection);        //删除一个临界资源对象
     }

     bool AddTail(TQueryReq *data)                                    //添加到队列的尾部
     {
          ::EnterCriticalSection(&m_rCriticalSection);
          push_back(data);
          ::LeaveCriticalSection(&m_rCriticalSection);

          return true;
     }

     int  GetCount()                                            //获得队列的个数
     {
          int nCount;
          ::EnterCriticalSection(&m_rCriticalSection);
          if (! empty()) 
          {
              nCount = size();
          }
          else
          {
                nCount = 0;
          }
          
          ::LeaveCriticalSection(&m_rCriticalSection);
          return nCount;
     }
     
     TQueryReq * GetFront()                                //移动到队列的头部
     {
          TQueryReq *data; 
          ::EnterCriticalSection(&m_rCriticalSection);
          if (! empty()) 
          {
              data = front();
              pop_front();
          }
          else
          {
              data = NULL;
          }
          ::LeaveCriticalSection(&m_rCriticalSection);
          return data;
     }


      void Clear()                                          //清除
      {
          ::EnterCriticalSection(&m_rCriticalSection);
          while (! empty()) 
          {
              TQueryReq *data = front();
              pop_front();
              delete data;
          }
          ::LeaveCriticalSection(&m_rCriticalSection);
      }

   public:
       CRITICAL_SECTION m_rCriticalSection; 
};

//如何在代码中进行应用
QueryMyQueue      m_MyReqQueue;

    if ( pUserQuery->m_MyReqQueue.GetCount() > 500 )   //记得要包含Query的头文件