FlagRightsConditional{TRights}.cs

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using System;
 
namespace Tgstation.Server.Host.Security.RightsEvaluation
{
    public sealed class FlagRightsConditional<TRights> : RightsConditional<TRights>
        where TRights : Enum
    {
        readonly TRights flag;
 
        public FlagRightsConditional(TRights flag)
        {
            var asUlong = (ulong)(object)flag;
 
            if (asUlong == 0)
                throw new ArgumentOutOfRangeException(nameof(flag), flag, "Flag cannot be zero!");
 
            // https://stackoverflow.com/a/28303898/3976486
            if ((asUlong & (asUlong - 1)) != 0)
                throw new ArgumentException("Right has more than one bit set!", nameof(flag));
 
            this.flag = flag;
        }
 
        public override bool Evaluate(TRights rights)
            => rights.HasFlag(flag);
 
        public override string ToString()
            => $"{typeof(TRights).Name}.{flag}";
    }
}