Thread: Finding address pointing to a value

I'd like to get the maximum of these values, and then locating the address of the result. How do I do this?

Code:

max( max(player[0].pts, player[1].pts),
            max(player[2].pts, player[3].pts));

I also tried using max_element, but I can't figure out how to do it on structs.

Originally Posted by 843

I also tried using max_element, but I can't figure out how to do it on structs.

Overload operator< for your struct type, or define a predicate and pass it to max_element.

Once max_element returns an iterator to the max element, you dereference the iterator and take the address of the result.

Originally Posted by 843

What's a predicate?

A function, or function object, that returns a bool depending on some condition typically related to some property of one or more objects, e.g., if an object is "less than" another object.

Originally Posted by 843

Could you please give me a quick example?

Yes:

Code:

#include <algorithm>
#include <iostream>

struct Player
{
    int points;
};

// Predicate to compare Player objects by points.
bool compareByPoints(const Player& x, const Player& y)
{
    return x.points < y.points;
}

int main()
{
    using namespace std;
    Player players[4] = {{2}, {4}, {1}, {3}};
    cout << max_element(players, players + 4, compareByPoints)->points << endl;
}