Tilde Enum

TildeEnum.cs

 public enum TestEnum
    {
        A,
        B,
        C
    }
    
    var t = ~TestEnum.A;  // t = ~1;
    var t = ~TestEnum.B;  // t = ~1;   
    var t = ~TestEnum.C;  // t = ~1;       
    
    // ----------------------------------------------------------
    
    public enum TestEnum
    {
        A,
        B,
        C,
        All = ~0
    }
    
    var t = TestEnum.All;  // t = ~1;