STL list中对象排序

        STL list可以对基本数据、字符串直接调用sort()函数默认做升序排列，但是对于降序排列或者对非基本数据类型排序(对象、数组等)需要借助operator()函数实现，这点和Java中的List很相似。
具体调用函数：
list.sort(Cmpare());

其中Cmpare是一个类或结构体，成员函数operator()必须是公共类型的。

我举一个简单的例子(对学生按年龄降序排列)：

  

#ifndef _STUDENT_H_#define _STUDENT_H_#include <string>using namespace std;class Student {private:    int age;string name;public:void setAge(int age);void setName(string name);int getAge() const;     string getName() const;};#endif#include "Student.h"void Student::setAge(int age){this->age = age;}void Student::setName(string name) {this->name = name;}int Student::getAge() const{return this->age;}string Student::getName() const{return this->name;}#ifndef _CMPARE_H_#define _CMPARE_H_#include "Student.h"class Cmpare{public:bool operator()(const Student st1,const Student  st2) const;};#endif#include "Cmpare.h"bool Cmpare::operator()(const Student st1,const Student  st2) const {return st1.getAge() > st2.getAge();   }#include "stdafx.h"#include <stdlib.h>#include <list>#include <iostream>#include "Cmpare.h"using namespace std;int _tmain(int argc, _TCHAR* argv[]){    Student stu1;stu1.setAge(20);stu1.setName("stu1");Student stu2;stu2.setAge(18);stu2.setName("stu2");    Student stu3;stu3.setAge(17);stu3.setName("stu3");Student stu4;stu4.setAge(22);stu4.setName("stu4");list<Student> stuList;stuList.push_back(stu1);stuList.push_back(stu2);stuList.push_back(stu3);stuList.push_back(stu4);   stuList.sort(Cmpare());   list<Student>::iterator stuIter = stuList.begin();   for( ; stuIter != stuList.end() ; stuIter ++)    {   cout<<"name:"<<(*stuIter).getName() <<",age:"<<(*stuIter).getAge()<<endl;   }   return 0;}

运行结果：
    name:stu4,age:22
     name:stu1,age:20
     name:stu2,age:18
     name:stu3,age:17