Update enum to the next or previous state

I have an enum type and added two helper functions to set the enum to the next value or previous value but it doesn't seem to update and i do not know why.

My enums are setup like this:

public enum State
{
    None = 0,
    A = 1,
    B = 2,
    Complete = 3
}

My helper methods look like this:

public static State Next(this State state) => (State)Math.Clamp((int)state++, (int)State.None, (int)State.Complete);
public static State Prev(this State state) => (State)Math.Clamp((int)state--, (int)State.None, (int)State.Complete);

And i use the functions like this:

print(_state);
_state = _state.Next();
print(_state);   

However the prints give me the same result both times:

A
A

What am i getting wrong here?

Your helper methods should be written as follows:

public static State Next(this State state) => (State)Math.Clamp((int)state + 1, (int)State.None, (int)State.Complete);
public static State Prev(this State state) => (State)Math.Clamp((int)state - 1, (int)State.None, (int)State.Complete);	

Your problem was that you were using the postfix operators (int)state++ and (int)state--:

> The result of x++ is the value of x before the operation.

Thus you were passing the original values of state into Math.Clamp(), which it duly returned.

Demo here.