re: Integer Based Bit Manipulation - C#

ReSc — Tue, 08 Jan 2008 17:49:30 GMT

YZ: Nope it can't, you missed the bit about ensuring there is only 1 bit set ;-)

System.Collections.Specialized.BitVector32 would be the pre-cooked solution.

anyways, in the usage code snippet given i would be much happier if an enum with the flags attribute was used like:

[Flags]

public enum Permissions

{

None = 0,

Read = 1,

Write = 2,

Delete = 4,

ReadWrite = Read | Write,

Admin = ReadWrite | Delete,

}

then you could do:

Permissions p = Permissions.Read | Permissions.Write

testing would be a but ugly though:

bool readable = (p & Permissions.Read) == Permissions.Read;

But that could be fixed a few finely crafted extension methods...

YZ — Mon, 07 Jan 2008 15:26:42 GMT

Interesting.

How about this:

return state ? (target | bit) : (target & ~bit);

This single line can replace your whole SetBit method :-)