C# Enum Flags 예제

Enum Flags 예제

using System;
 
[Flags]
public enum BitFlag {
    None = 0,
    Bit1 = 1 << 0,
    Bit2 = 1 << 1,
    Bit3 = 1 << 2,
    Bit4 = 1 << 3,
    Bit5 = 1 << 4,
    Bit6 = 1 << 5,
    Bit7 = 1 << 6,
    Bit8 = 1 << 7,
    Bit9 = 1 << 8,
    Bit10 = 1 << 9,
    Bit11 = 1 << 11,
    Bit12 = 1 << 12,
    Bit13 = 1 << 13,
    Bit14 = 1 << 14,
    Bit15 = 1 << 15,
    Bit16 = 1 << 16,
    Bit17 = 1 << 17,
    Bit18 = 1 << 18,
    Bit19 = 1 << 19,
    Bit20 = 1 << 20,
    Bit21 = 1 << 21,
    Bit22 = 1 << 22,
    Bit23 = 1 << 23,
    Bit24 = 1 << 24,
    Bit25 = 1 << 25,
    Bit26 = 1 << 26,
    Bit27 = 1 << 26,
    Bit28 = 1 << 27,
    Bit29 = 1 << 28,
    Bit30 = 1 << 29,
    Bit31 = 1 << 30,
    Bit32 = 1 << 31,
}

class Program {
    static void Main(string[] args)
    {
        BitFlag testFlag = BitFlag.None;
        testFlag.Print("Add", BitFlag.Bit4);
        testFlag.Print("Remove", BitFlag.Bit4);
        testFlag.Print("Reversal", BitFlag.Bit4);
        testFlag.Print("Has", BitFlag.Bit4);

        testFlag.Print("Add", BitFlag.Bit4 | BitFlag.Bit8);
        testFlag.Print("Remove", BitFlag.Bit4);
        testFlag.Print("Reversal", BitFlag.Bit8);
        testFlag.Print("Has", BitFlag.Bit4 | BitFlag.Bit8);
    }
}


public static class BitMask {
    public static bool HasFlag(BitFlag mask, BitFlag checkFlag)
    {
        return (mask & checkFlag) != 0;
    }

    public static void AddFlag(this ref BitFlag mask, BitFlag flag)
    {
        mask |= flag;
    }

    public static void RemoveFlag(this ref BitFlag mask, BitFlag flag)
    {
        mask &= ~flag;
    }

    public static void ReversalFlag(this ref BitFlag mask, BitFlag flag)
    {
        mask ^= flag;
    }

    public static void Print(this ref BitFlag print, string action, BitFlag bitFlag)
    {
        Console.WriteLine($"시작 : Flag = {print}, Bit = {Convert.ToString((int)print, 2)}");
        switch (action) {
            case "Has":
                var maskBitStr = Convert.ToString((int)print, 2);
                var checkFlagBitStr = Convert.ToString((int)bitFlag, 2);
                Console.ForegroundColor = ConsoleColor.Blue;
                Console.WriteLine($"비교 : mask({print}, {maskBitStr}) & checkFlag({bitFlag}, {checkFlagBitStr})");
                Console.ResetColor();
                Console.WriteLine($"결과 : {HasFlag(print, bitFlag)}");
                break;
            case "Add":
                print.AddFlag(bitFlag);
                Console.ForegroundColor = ConsoleColor.Green;
                Console.WriteLine($"추가 : Flag |= {bitFlag}({Convert.ToString((int)bitFlag, 2)})");
                Console.ResetColor();
                Console.WriteLine($"결과 : Flag = {print}, Bit = {Convert.ToString((int)print, 2)}");
                break;
            case "Remove":
                print.RemoveFlag(bitFlag);
                Console.ForegroundColor = ConsoleColor.Red;
                Console.WriteLine($"제거 : Flag &= ~{bitFlag}({Convert.ToString((int)~bitFlag, 2)})");
                Console.ResetColor();
                Console.WriteLine($"결과 : Flag = {print}, Bit = {Convert.ToString((int)print, 2)}");
                break;
            case "Reversal":
                print.ReversalFlag(bitFlag);
                Console.ForegroundColor = ConsoleColor.Yellow;
                Console.WriteLine($"반전 : Flag ^= {bitFlag}({Convert.ToString((int)bitFlag, 2)})");
                Console.ResetColor();
                Console.WriteLine($"결과 : Flag = {print}, Bit = {Convert.ToString((int)print, 2)}");
                break;
        }
        Console.WriteLine("-------------------------------------------");
    }
}

출력 결과