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呜呜呜

#include <iostream>
#include <set>
using namespace std;

/*定义一个Student结构体,包括name和age等数据,
要求编程实现在set中查找一个name == "张三", age == 13的操作。*/
/*Student结构体*/
struct Student {
string name;
int age;
string sex;
};


/*为Student set指定排序准则*/
class studentSortCriterion {
public:
bool operator() (const Student &a, const Student &b) const {
/*先比较名字;若名字相同,则比较年龄。小的返回true*/
if(a.name < b.name)
return true;
else if(a.name == b.name) {
if(a.age < b.age)
return true;
else
return false;
} else
return false;
}
};

int main()
{
set<Student, studentSortCriterion> stuSet;
Student stu1, stu2;
stu1.name = "张三";
stu1.age = 13;
stu1.sex = "male";

stu2.name = "李四";
stu2.age = 23;
stu2.sex = "female";

stuSet.insert(stu1);
stuSet.insert(stu2);

/*构造一个测试的Student,可以看到,即使stuTemp与stu1实际上并不是同一个对象,
*但当在set中查找时,仍会查找成功。这是因为已定义的studentSortCriterion的缘故。
*/
Student stuTemp;
stuTemp.name = "张三";
stuTemp.age = 13;

set<Student, studentSortCriterion>::iterator iter;
iter = stuSet.find(stuTemp);
if(iter != stuSet.end()) {
cout << (*iter).name << endl;
} else {
cout << "Cannot fine the student!" << endl;
}

return 0;
}

呜呜呜