What does "<<" stand for in C#? [duplicate]

This question already has answers here: What does the operator "<<" mean in C#? (9 answ开发者_JAVA技巧ers) Closed 7 years ago.

What does << do in this piece of code?

[Serializable]
[Flags]
public enum SiteRoles
{
    User = 1 << 0,
    Admin = 1 << 1,
    Helpdesk = 1 << 2
}

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It means bitshift left, so:

int i = 1 << 2;

// 0000 0001 (1)
// shifted left twice
// 0000 0100 (4)

A left bitshift is analogous to multiplying by two, and a right bitshift acts as a divide by two.

Bitshifts are useful because they convey semantics better when working with bitmasks and they are (on x86 at least) faster than multiplication

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Bitwise shifting.

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Bitshifting Just like in C++

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Bitwise Shifting

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It is a Bitwise shift.

Admin = 1 << 1 means one's binary value move to left one bit.

The result is

Admin = 2