[Flag] enum: Setting values

[Arokh]

Hi,

I've created an enum with the Flag attribute and I want to use it as such, but the creating part is a little annoying.

I've tried to make it less annoying by using Math.Pow but Csharp doesn't like that:

[CSharp][FlagsAttribute]

public enum eDBFCode {

//Byte 1

//B17=Math.Pow(2,0),

B16_AId = Math.Pow(2, 1),

B15_EId = Math.Pow(2, 2),

B14_GId = Math.Pow(2, 3),

B13_LId = Math.Pow(2, 4),

B12_LstOtherEps = Math.Pow(2, 5),

B11_IsDeprecated = Math.Pow(2, 6),

B10_State = Math.Pow(2, 7),

//Byte 2

B27_Size = Math.Pow(2, 8),

B26_Ed2k = Math.Pow(2, 9),

B25_Md5 = Math.Pow(2, 10),

B24_Sha1 = Math.Pow(2, 11),

B23_Crc32 = Math.Pow(2, 12),

//B22=Math.Pow(2,13),

//B21=Math.Pow(2,14),

//B20=Math.Pow(2,15),

//Byte 3

B37_Quality = Math.Pow(2, 16),

B36_Source = Math.Pow(2, 17),

B35_AudioCodec = Math.Pow(2, 18),

B34_AudioBitRate = Math.Pow(2, 19),

B33_VideoCodec = Math.Pow(2, 20),

B32_VideoBitRate = Math.Pow(2, 21),

B31_VideoRes = Math.Pow(2, 22),

B30_FileExt = Math.Pow(2, 23),

//Byte 4

B47_DubLanguage = Math.Pow(2, 24),

B46_SubLanguage = Math.Pow(2, 25),

B45_LengthInSec = Math.Pow(2, 26),

B44_Description = Math.Pow(2, 27),

B43_ReleaseDate = Math.Pow(2, 28),

//B42=Math.Pow(2,29),

//B41=Math.Pow(2,30),

B40_AniDBFileName = Math.Pow(2, 31)

}

[/CSharp]

 

Is there a way of 'automatically' setting the right values for the enum?

Entering every value manually isn't something I'm too fond of.

[Arokh]

I found a nice solution, with bitwise shifting.

 

B33_VideoCodec = 1048576 vs

B33_VideoCodec = 1 << 20

 

But if there is still a simpler solution let me hear it.

[snarfblam]

Unfortunately, C# has no built-in support for [Flags] enumerations. In other words, no automatic value assignment, no direct access to individual flags in composite values, etc..

 

I prefer to write hex literals for the constants, but your bit-shifting solution is probably your best bet.