error C2064: term does not evaluate to a function taking 2

[ZeHgS]

Hi guys. I'm getting this error

Error 5 error C2064: term does not evaluate to a function taking 2 arguments C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\xrefwrap 431 1


after trying to do this

typedef std::function<int(int, int)> op;

op someOperator = std::plus<int>();
op someOtherOperator = std::minus<int>();

so I can call a function like

UpdateValues(int X, int Y, op One, op Two)
{
      //eventually doing something like
      One(X, someOtherInt);
      Two(Y, someOtherInt);
}

What is going on?

Here is a link to my files if you need them https://www.dropbox.com/s/vn2akcyb9f448e6/Checkers.rar?dl=0

[Peter87]

std::plus<int> is a class so I think you will have to construct an object, using parentheses.

op someOperator = std::plus<int>();

[ZeHgS]

ops, sorry, I was already doing that, I just didn't include it in the code! What else could it be?

[Peter87]

Make sure the code that you post actually exhibit the problem that you are having, becasue I have no problem with your code.

#include <iostream>
#include <functional>

typedef std::function<int(int, int)> op;

op someOperator = std::plus<int>();
op someOtherOperator = std::minus<int>();

const int someOtherInt = 5;

void UpdateValues(int X, int Y, op One, op Two)
{
	std::cout << One(X, someOtherInt) << std::endl;
	std::cout << Two(Y, someOtherInt) << std::endl;
}

int main()
{
	UpdateValues(1, 2, someOperator, someOtherOperator);
}

[ZeHgS]

You were right, the problem was somewhere else! Thanks a lot for your answer, in the end there were three separate things that kept generating that error:

I was passing an op object in place of a bool parameter
I was passing an op* object in place of an op parameter
I was passing an op object in place of an op* paramater