Store an operator in a variable

Question

Is there a way to store an operator inside a variable? I want to do something like this (pseudo code):

void MyLoop(int start, int finish, operator op)
{
    for(var i = start; i < finish; op)
    {
        //do stuff with i
    }
}

I could then call this method like so:

MyLoop(15, 45, ++);
MyLoop(60, 10, --);

Does something like this exist in C#?

Answer 1

I suppose something like this. You do not define the operator, but a function (lambda) which does the change for you.

void MyLoop(int start, int finish, Func<int, int> op)
{
    for(var i = start; i < finish; i = op(i))
    {
        //do stuff with i
    }
}

I could then call this method like so:

MyLoop(15, 45, x => x+1);
MyLoop(60, 10, x => x-1);

Answer 2

Use a Function delegate;

Encapsulates a method that has one parameter and returns a value of the type specified by the TResult parameter.

void MyLoop(int start, int finish, Func<int, int> op)
{
    for(var i = start; i < finish; i = op(i))
    {
        //do stuff with i
    }
}

Then;

MyLoop(15, 45, x => ++x);
MyLoop(60, 10, x => --x);

Here is a DEMO.