Define a class with mutable variable

Define a class with mutable variable

• Category: Defining Types
• Description: Define a class with mutable variable
• Code:

using System;
using System.Console;

enum BuilderState
{
  | None
  | Active
  | Completed
}

using BuilderState;

	  class Builder
	  {
	    // a current state mutable auto property with private setter
	    public CurrentState : BuilderState { get; private set; }

	    public Begin() : void
	    {
		  CurrentState = Active
	    }

	    public End() : void
	    {
		  // complete the build process...
		  CurrentState = Completed
	    }
	  }

    def print_state(b) { WriteLine($"current state = $(b.CurrentState)") }

    def b = Builder();
    print_state(b);
    b.Begin();
    print_state(b);
    b.End();
    print_state(b);

• Execution Result:

current state = None
current state = Active
current state = Completed