using System;
using System.Threading;

namespace Preparation.Utility
{
    //其对应属性不应当有set访问器，避免不安全的=赋值

    public class AtomicBool
    {
        private int v;//v==0为false,v==1为true
        public AtomicBool(bool x)
        {
            v = x ? 1 : 0;
        }
        public override string ToString() => (Interlocked.CompareExchange(ref v, -2, -2) == 0) ? "false" : "true";
        public bool Get() => (Interlocked.CompareExchange(ref v, -1, -1) != 0);
        public static implicit operator bool(AtomicBool abool) => (Interlocked.CompareExchange(ref abool.v, -1, -1) != 0);
        /// <returns>返回操作前的值</returns>
        public bool SetReturnOri(bool value) => (Interlocked.Exchange(ref v, value ? 1 : 0) != 0);
        /// <returns>赋值前的值是否与将赋予的值不相同</returns>
        public bool TrySet(bool value)
        {
            return (Interlocked.CompareExchange(ref v, value ? 1 : 0, value ? 0 : 1) ^ (value ? 1 : 0)) != 0;
        }
        public bool And(bool x) => Interlocked.And(ref v, x ? 1 : 0) != 0;
        public bool Or(bool x) => Interlocked.Or(ref v, x ? 1 : 0) != 0;
    }
}