Problem with Bitwise Barrel Shift Rotate left and right in C#

问题

In C++ I have code like this.

    static UInt32 rol(UInt32 value, UInt32 bits)
    {
        bits &= 31;
        return ((value << bits) | (value >> (32 - bits)));
    }

    static UInt32 ror(UInt32 value, UInt32 bits)
    {
        bits &= 31;
        return ((value >> bits) | (value << (32 - bits)));
    }

how would it look in C#? I think the same exact way.. only problem

Error 2 Operator '>>' cannot be applied to operands of type 'uint' and 'uint'
Error 3 Operator '>>' cannot be applied to operands of type 'uint' and 'uint'
Error 1 Operator '<<' cannot be applied to operands of type 'uint' and 'uint'
Error 4 Operator '<<' cannot be applied to operands of type 'uint' and 'uint'

回答1:

You should use int type for the right side variable in shift operators.

回答2:

You will have to cast the right side of the bitshift operator to int. If you cast like (int)(32 - bits), it should not affect your intended purpose. The right side is just expecting an int, probably because it's simpler that way and highly unlikely you'll ever want to shift more than 2 billion bits.

回答3:

The right operand must be always type int.

 int x << int bits
 uint x << int bits
 long x << int bits
 ulong x << int bits

来源：https://stackoverflow.com/questions/7289316/problem-with-bitwise-barrel-shift-rotate-left-and-right-in-c-sharp