Notas sobre la sobrecarga de operadores de entrada y salida
Los operadores de entrada y salida sobrecargados deben escribirse como "Función de amigo"
Ejemplo:
#include <iostream>
#include <string>
#include <algorithm>
using namespace std;
class Student {
private:
string name;
int score;
protected:
friend bool cmp(const Student& s1, const Student& s2);
public:
Student() {
}
Student(string name_, int score_) :name(name_), score(score_) {
}
string getName() const {
return this->name; }
int getScore() const {
return this->score; }
friend void StudentSort(const Student stu[], int n);
friend ostream& operator << (ostream& out, const Student& stu);
friend istream& operator >> (istream& in, const Student& stu);
};
ostream& operator << (ostream& out, const Student& stu) {
out << "姓名：" << stu.getName() << " 分数：" << stu.getScore() << endl;
return out;
}
istream& operator >> (istream& in, Student& stu) {
string name;
int score;
in >> name >> score;
stu = Student(name, score);
return in;
}
bool cmp(const Student& s1, const Student& s2) {
if (s1.score != s2.score)
return s1.score > s2.score;
return s1.name < s2.name;
}
void StudentSort(Student stu[], int n) {
sort(stu, stu + n, cmp);
}
int main() {
Student stu[3];
for (int i = 0; i < 3; ++i)
cin >> stu[i];
cout << "------------排序前------------" << endl;
for (int i = 0; i < 3; ++i)
cout << stu[i];
StudentSort(stu, 3);
cout << "------------排序后------------" << endl;
for (int i = 0; i < 3; ++i)
cout << stu[i];
return 0;
}
Ejecute la demostración:
