如何重载运算符<用于对象的排序方法? [英] How overload operator < for sort method for objects?

问题描述

例如，我有这个对象

 class Employee{
    int id;
    string name;
    string secName;
    }

我的主要是:

int main(){
vector<Employee> vec = {Employee(1, "Andy", "Good"), Employee(5, "Adam", "Bad"), Employee(2, "Some", "Employee")}

sort(vec.begin(), vec.end())

}

当我有一个要排序的参数时，我知道向量的重载排序方法.就像:

I know how overload sort method for vector when I have one parameter for sorting. It's like:

 bool operator<(Employee a, Employee b ){
    if (a.name<b.name) return true;
    else return false;
    }

但是关键是我不仅对一个参数进行排序，而且对所有参数进行排序.那么我应该如何更改重载方法?

But the point is that I have sort not only on one parameter, but on all. So how should I change overloading method?

我已经尝试过这种方法，但是没有用.

I've tried this way, but it doesn't work.

bool operator<(Employee a, Employee b)
{
    if (a.id < b.id)
        if (a.name < b.name)
            if (a.surname<b.surname)return true; else return false;
        else return false;
    else return false;
}

推荐答案

如果要主要按id排序，其次是按名称排序，然后按secName进行三级排序，这应该可以:

If you want to sort primarily by id, secondarily by name and tertiary by secName this should work:

bool operator<(Employee a, Employee b)
{
    if (a.id < b.id) return true;
    if (a.id > b.id) return false;
    if (a.name < b.name) return true;
    if (a.name > b.name) return false;
    if (a.secName < b.secName) return true;
    return false;
}

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