#include <iostream>
#include <algorithm>
#include<functional>
#include<vector>
 
 
using namespace std;
using namespace std::placeholders;
 
 
struct MyType
{
	int _val;
	MyType(int a) : _val(a){}
	int val() const { return _val; }
};
 
 
int main()
{
	vector<MyType> vec{ 1, 2, 4, 5 };
 
	auto m = std::max_element(vec.begin(), vec.end(), 
                              bind(less<int>(), bind(&MyType::val, _1), bind(&MyType::val, _2)));
 
	std::cout << m->val() << endl;
 
	return 0;
}

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