Is there support in C++/STL for sorting objects by attribute?

Question

I wonder if there is support in STL for this:

Say I have an class like this :

class Person
{
public:
  int getAge() const;
  double getIncome() const         


        

Answer 1

You don't need to create a class - just write a function:

#include 
#include 
using namespace std;

struct Person {
    int age;
    int getage() const {
        return age;
    }
};

bool cmp( const Person * a, const Person * b ) {
    return a->getage() < b->getage() ;
}

int main() {
    vector  v;
    sort( v.begin(), v.end(), cmp );
}