BITFALL/Assets/BITKit/Core/Optional/Optional.cs

namespace BITKit
{
    public interface IOptional
    {
        bool Allow { get; }
        object Value { get; }
    }
    public interface IOptional<T>
    {
        bool Allow { get; set; }
        T Value { get; set; }
    }
    [System.Serializable]
    public class Optional<T> : IOptional<T>
    {
#if NET5_0_OR_GREATER
        bool allow;
        T value;
#else
        [UnityEngine.SerializeField]
        bool allow;
        [UnityEngine.SerializeField]
        T value;
#endif
        public bool Allow { get => allow; set => allow = value;}
        public T Value
        {
            get => value;
            set=>this.value=value;
        }

        public void SetValueThenAllow(T newValue)
        {
            value = newValue;
            allow = true;
        }

        public void Clear()
        {
            Allow = false;
            value = default;
        }
        
        public static implicit operator T(Optional<T> self)
        {
            return self.value;
        }
    }
}