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#include <iostream>
#include <functional>
 
template<typename T, typename U>
class BinaryFunctor
{
public:
    BinaryFunctor(std::function<U(T,T)> a, std::function<U(T,T)> b): a_(a), b_(b) {}
 
	bool operator()(T left, T right)
	{
		return a_(left, right) < b_(left, right);
	}
 
private:
	std::function<U(T,T)> a_;
	std::function<U(T,T)> b_;
};
 
int plus(int l, int r) { return l + r; }
int minus(int l, int r) { return l - r; }
 
int main(int argc, char* argv[])
{
	BinaryFunctor<int, int> f(plus, minus);
	std::cout << f(1, 2) << std::endl;
 
	std::cin.get();
	return 0;
}

prog.cpp:8: error: expected `)' before ‘<’ token
prog.cpp:16: error: ISO C++ forbids declaration of ‘function’ with no type
prog.cpp:16: error: invalid use of ‘::’
prog.cpp:16: error: expected ‘;’ before ‘<’ token
prog.cpp:17: error: ISO C++ forbids declaration of ‘function’ with no type
prog.cpp:17: error: invalid use of ‘::’
prog.cpp:17: error: expected ‘;’ before ‘<’ token
prog.cpp: In function ‘int main(int, char**)’:
prog.cpp:25: error: no matching function for call to ‘BinaryFunctor<int, int>::BinaryFunctor(int (&)(int, int), int (&)(int, int))’
prog.cpp:6: note: candidates are: BinaryFunctor<int, int>::BinaryFunctor()
prog.cpp:6: note:                 BinaryFunctor<int, int>::BinaryFunctor(const BinaryFunctor<int, int>&)
prog.cpp: In member function ‘bool BinaryFunctor<T, U>::operator()(T, T) [with T = int, U = int]’:
prog.cpp:26:   instantiated from here
prog.cpp:12: error: ‘b_’ was not declared in this scope
prog.cpp:12: error: ‘a_’ was not declared in this scope

Standard output is empty