What do two left-angle brackets “<<” mean in C#?

Question

Basically the questions in the title. I\'m looking at the MVC 2 source code:

[Flags]
public enum HttpVerbs {
    Get = 1 << 0,
    Post = 1 << 1,         


        

Answer 1

That's the left bitshift operator. It shifts the bit pattern of the left operand to the left by the number of binary digits specified in the right operand.

Get = 1 << 0, // 1
Post = 1 << 1, // 2
Put = 1 << 2,  // 4
Delete = 1 << 3, // 8
Head = 1 << 4  // 16

This is semantically equivalent to lOperand * Math.Pow(2, rOperand)