Is it possible to add Extra custom keyword to c# program so that makes two int variables different types? -

i need create 2 keywords input , output can have these decelerations in c# code:

input int a; input int b; output int c; swap (input int lhs, output int rhs) { ... } swap(a,c) // should compiled; swap(c,a) // should return compile error swap(a,b) // should return compile error 

i need compiler accept a = b reject b = c or c = a. possible? if not possible solution? use output<t> , input<t> generic wrappers types hate using value getter , setter whenever want access values inside these generic wrappers!

you can use this:

public sealed class input<t> {     public t value { get; set; }      public input(t v)     {         value = v;     }      public static implicit operator t(input<t> d)     {         return d.value;     }      public static implicit operator input<t>(t d)     {         return new input<t>(d);     } }  public sealed class output<t> {     public t value { get; set; }      public output(t v)     {         value = v;     }      public static implicit operator t(output<t> d)     {         return d.value;     }      public static implicit operator output<t>(t d)     {         return new output<t>(d);     } } 

then swap method looks like:

    static void swap<t>(input<t> input, output<t> output)     {         output.value = input.value;     } 

and usage:

            input<int> myinput = 1;             input<int> myinput2 = 1;             output<int> myoutput = 0;              swap(myinput, myoutput); //compiles             swap(myinput, myinput2); //error             swap(myoutput, myinput); //error