FunctorSort.cpp

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

class Monster {

    public:
    int health;
    int level;
    char type;

    Monster(int _h, int _l, char _c) {
    health = _h;
    level = _l;
    type = _c;
    }

};

struct MonsterHealthSorter
{
    bool operator () (Monster m1, Monster m2)
    {
        return m1.health < m2.health;
    }
};
struct MonsterTypeSorter
{
    bool operator () (Monster m1, Monster m2)
    {
        return m1.type < m2.type;
    }
};

int main()
{
    vector<Monster> monsters = {Monster(100, 1, 'A'),Monster(50, 3, 'C'),Monster(400, 2, 'B')}; //default order
    // printing the unsorted Monster array
    for(int i = 0 ; i < monsters.size() ; i++)
    {
        cout << monsters[i].health << " "; // output 100, 50,  400 (NOT sorted by health)
    }
    cout << endl;
    sort(monsters.begin(), monsters.end(), MonsterHealthSorter());
    for(int i = 0 ; i < monsters.size() ; i++)
    {
        cout << monsters[i].health << " "; // output 50, 100,  400 (sorted by health)
    }
    cout << endl;
    sort(monsters.begin(), monsters.end(), MonsterTypeSorter());
    for(int i = 0 ; i < monsters.size() ; i++)
    {
        cout << monsters[i].type << " "; // output A, B, C (sorted by type)
    }
}