容器中数据类型为结构体时对其进行排序

#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
struct DataDistance
{
int		piclabel;			//图像标签
double	picdist;			//图像间距离
};
bool cmp1(const DataDistance &a,const DataDistance &b)
{
return(b.picdist<a.picdist);
}
int main()
{
vector<DataDistance> dis;
DataDistance dd;
for (int i=1;i<10;i++)
{
dd.piclabel=i;
dd.picdist=i+1;
dis.push_back(dd);
}
dis[3].picdist=12;
dis[3].piclabel=2;

sort(dis.begin(),dis.end(),cmp1);
for (int i=0;i<dis.size();i++)
{
cout<<dis[i].piclabel<<","<<dis[i].picdist<<endl;
}
return 0;
}