#include <algorithm>
#include <functional>
#include <iostream>
#include <vector>
 
class A
{
	int m_;
 
public:
	A(int m) : m_(m) {}
 
	int f() const { return m_; }
};
 
 
int main() {
	std::vector<A> vec{1, 2, 5, 3, 4};
	using namespace std::placeholders;
	A& max = *std::max_element(begin(vec), end(vec)
		, std::bind(
			&std::less<int>::operator()
			, std::less<int>()
			, std::bind(&A::f, _1)
			, std::bind(&A::f, _2)
		)
	);
	std::cout << max.f() << '\n';
}

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