AtomicFlag

AtomicFlag.cs

    class Program
    {
        static void Main(string[] args)
        {
            var f = new AtomicFlag(true);
            Console.WriteLine($"Value: {f.Value}");
            var oldVal = f.CompareExchange(true, false);
            Console.WriteLine($"Old Val: {oldVal}, Value: {f.Value}");
            oldVal = f.CompareExchange(true, false);
            Console.WriteLine($"Old Val: {oldVal}, Value: {f.Value}");
            oldVal = f.CompareExchange(false, true);
            Console.WriteLine($"Old Val: {oldVal}, Value: {f.Value}");
            oldVal = f.CompareExchange(true, false);
            Console.WriteLine($"Old Val: {oldVal}, Value: {f.Value}");
            Console.ReadLine();
        }
    }

    public struct AtomicFlag
    {
        private const int FalseValue = 0;
        private const int TrueValue = -1;
        private int _value;

        public AtomicFlag(bool value)
        {
            _value = value ? TrueValue : FalseValue;
        }

        public bool Value => _value == TrueValue;

        public bool CompareExchange(bool valueToSetTo, bool valueToCheckAgainst)
        {
            return Interlocked.CompareExchange(ref _value,
                valueToSetTo ? TrueValue : FalseValue,
                valueToCheckAgainst ? TrueValue : FalseValue)
                == TrueValue;
        }

        /*public static implicit operator AtomicFlag(bool input)
            => new AtomicFlag(input);

        public static implicit operator bool(AtomicFlag input)
            => input.Value;*/
    }