What USEFUL bitwise operator code tricks should a developer know about?

Question

I must say I have never had cause to use bitwise operators, but I am sure there are some operations that I have performed that would have been more efficiently done with them. How have "shifting" and "OR-ing" helped you solve a problem more efficiently?

Answer 1

I have used in C# by using the flag attribute on an enum class.

[Flags]

public enum Permissions

{

None = 0,

Read = 1 << 0, // 1

Write = 1 << 1, // 2

Execute = 1 << 2 // 4

}

below are examples of using to combine flags and also check if a flag exists.

var userPermissions = Permissions.Read | Permissions.Write;

bool canRead = (userPermissions & Permissions.Read) == Permissions.Read;