bit mask example

BitMaskTest/BitMaskTest.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+  </PropertyGroup>
+
+</Project>

BitMaskTest/BitMaskTest.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.32630.194
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "BitMaskTest", "BitMaskTest.csproj", "{AACE96BB-69D6-4E58-BB24-27B57CE5AC2B}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{AACE96BB-69D6-4E58-BB24-27B57CE5AC2B}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{AACE96BB-69D6-4E58-BB24-27B57CE5AC2B}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{AACE96BB-69D6-4E58-BB24-27B57CE5AC2B}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{AACE96BB-69D6-4E58-BB24-27B57CE5AC2B}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {D595499E-EBA3-423F-AF31-7175387FA570}
+	EndGlobalSection
+EndGlobal

BitMaskTest/FlagsHelper.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace BitMaskTest
+{
+	class FlagsHelper
+	{
+	}
+}

BitMaskTest/PopupButtonMask.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace BitMaskTest
+{
+	[Flags]
+	public enum ButtonMask
+	{
+		None = 0x00,
+		Remove = 0x01,
+		LevelUp = 0x02,
+		Change = 0x04,
+		Reset = 0x08,
+		Cancel = 0x10,
+	}
+
+	class PopupButtonMask
+	{
+		public ButtonMask Mask { get; set; } = ButtonMask.None;
+
+		public List<ButtonMask> GetButtons()
+		{
+			List<ButtonMask> buttons = new List<ButtonMask>();
+			foreach (ButtonMask flag in Enum.GetValues(typeof(ButtonMask)))
+			{
+				if (checkMask(flag))
+					buttons.Add(flag);
+			}
+
+			if (buttons == null || buttons.Count < 1)
+				return null;
+
+			return buttons;
+		}
+
+		private bool checkMask(ButtonMask compareTarget)
+		{
+			int flags = (int)this.Mask;
+			int flag = (int)compareTarget;
+
+			return (flags & flag) != 0;
+		}
+	}
+}

BitMaskTest/Program.cs

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+using System;
+using System.Collections.Generic;
+
+namespace BitMaskTest
+{
+	/*
+	 * AND &: 비트가 모두 1일 때 1 반환
+	 * 1011 & 1001 = 1001
+	 * 
+	 * OR |: 비트가 하나라도 1일 때 1 반환
+	 * 1011 | 1001 = 1011
+	 * 
+	 * XOR ^: 비트가 같지 않을 때 1 반환
+	 * 1011 ^ 1001 = 0010
+	 * 
+	 * NOT ~: 비트 반전
+	 * ~1011 = 0100
+	 * 
+	 * Shift << >>: 비트를 옮기는 연산
+	 * 001011 << 2 = 101100
+	 * 001011 >> 2 = 000010
+	 */
+	class Program
+	{
+		static void Main(string[] args)
+		{
+			PopupButtonMask popupButton = new PopupButtonMask();
+			popupButton.Mask = ButtonMask.LevelUp | ButtonMask.Reset | ButtonMask.Cancel | ButtonMask.Remove | ButtonMask.Change;
+
+			List<ButtonMask> buttons = popupButton.GetButtons();
+			foreach (ButtonMask item in buttons)
+			{
+				Console.WriteLine(item);
+			}
+
+			Console.ReadKey();
+		}
+	}
+}