FlagsAttribute コンストラクタとは何？わかりやすく解説 Weblio辞書

' Example of the FlagsAttribute attribute.
Imports System
Imports Microsoft.VisualBasic

Module FlagsAttributeDemo
    
    ' Define an Enum without FlagsAttribute.
    Enum SingleHue as Short
        Black = 0
        Red = 1
        Green = 2
        Blue = 4
    End Enum

    ' Define an Enum with FlagsAttribute.
    <FlagsAttribute( )> _
    Enum MultiHue as Short
        Black = 0
        Red = 1
        Green = 2
        Blue = 4
    End Enum

    Sub Main( )
        Console.WriteLine( _
            "This example of the FlagsAttribute attribute "
 & _
            vbCrLf & "generates the following output."
 )
        Console.WriteLine( vbCrLf & _
            "All possible combinations of values of an "
 & _
            vbCrLf & "Enum without FlagsAttribute:"
 & vbCrLf )
        
        ' Display all possible combinations of values.
        Dim val as Integer
        For val = 0 to 8
            Console.WriteLine( "{0,3} - {1}", _
                val, CType( val, SingleHue ).ToString( ) )
        Next val

        Console.WriteLine( vbCrLf & _
            "All possible combinations of values of an "
 & _
            vbCrLf & "Enum with FlagsAttribute:"
 & vbCrLf )
        
        ' Display all possible combinations of values.
        ' Also display an invalid value.
        For val = 0 to 8
            Console.WriteLine( "{0,3} - {1}", _
                val, CType( val, MultiHue ).ToString( ) )
        Next val
    End Sub 
End Module 

' This example of the FlagsAttribute attribute
' generates the following output.
' 
' All possible combinations of values of an
' Enum without FlagsAttribute:
' 
'   0 - Black
'   1 - Red
'   2 - Green
'   3 - 3
'   4 - Blue
'   5 - 5
'   6 - 6
'   7 - 7
'   8 - 8
' 
' All possible combinations of values of an
' Enum with FlagsAttribute:
' 
'   0 - Black
'   1 - Red
'   2 - Green
'   3 - Red, Green
'   4 - Blue
'   5 - Red, Blue
'   6 - Green, Blue
'   7 - Red, Green, Blue
'   8 - 8

// Example of the FlagsAttribute attribute.
using System;

class FlagsAttributeDemo
{
    // Define an Enum without FlagsAttribute.
    enum SingleHue : short
    {
        Black = 0,
        Red = 1,
        Green = 2,
        Blue = 4
    };

    // Define an Enum with FlagsAttribute.
    [FlagsAttribute] 
    enum MultiHue : short
    {
        Black = 0,
        Red = 1,
        Green = 2,
        Blue = 4
    };

    static void Main( )
    {
        Console.WriteLine( 
            "This example of the FlagsAttribute attribute \n" +
            "generates the following output." );
        Console.WriteLine( 
            "\nAll possible combinations of values of an \n" +
            "Enum without FlagsAttribute:\n" );
        
        // Display all possible combinations of values.
        for( int val = 0; val <= 8; val++
 )
            Console.WriteLine( "{0,3} - {1}", 
                val, ( (SingleHue)val ).ToString( ) );

        Console.WriteLine( 
            "\nAll possible combinations of values of an \n" +
            "Enum with FlagsAttribute:\n" );
        
        // Display all possible combinations of values.
        // Also display an invalid value.
        for( int val = 0; val <= 8; val++
 )
            Console.WriteLine( "{0,3} - {1}", 
                val, ( (MultiHue)val ).ToString( ) );
    } 
} 

/*
This example of the FlagsAttribute attribute
generates the following output.

All possible combinations of values of an
Enum without FlagsAttribute:

  0 - Black
  1 - Red
  2 - Green
  3 - 3
  4 - Blue
  5 - 5
  6 - 6
  7 - 7
  8 - 8

All possible combinations of values of an
Enum with FlagsAttribute:

  0 - Black
  1 - Red
  2 - Green
  3 - Red, Green
  4 - Blue
  5 - Red, Blue
  6 - Green, Blue
  7 - Red, Green, Blue
  8 - 8
*/

C++

// Example of the FlagsAttribute attribute.
using namespace System;

// Define an Enum without FlagsAttribute.
enum class SingleHue : short
{
   Black = 0,
   Red = 1,
   Green = 2,
   Blue = 4
};


// Define an Enum with FlagsAttribute.

[FlagsAttribute]
enum class MultiHue : short
{
   Black = 0,
   Red = 1,
   Green = 2,
   Blue = 4
};

int main()
{
   Console::WriteLine( "This example of the FlagsAttribute attribute \n"
   "generates the following output." );
   Console::WriteLine( "\nAll possible combinations of values of an \n"
   "Enum without FlagsAttribute:\n" );
   
   // Display all possible combinations of values.
   for ( int val = 0; val <= 8; val++ )
      Console::WriteLine( "{0,3} - {1}", val, ((SingleHue)val).ToString()
 );
   Console::WriteLine( "\nAll possible combinations of values of an \n"
   "Enum with FlagsAttribute:\n" );
   
   // Display all possible combinations of values.
   // Also display an invalid value.
   for ( int val = 0; val <= 8; val++ )
      Console::WriteLine( "{0,3} - {1}", val, ((MultiHue)val).ToString()
 );
}

/*
This example of the FlagsAttribute attribute
generates the following output.

All possible combinations of values of an
Enum without FlagsAttribute:

  0 - Black
  1 - Red
  2 - Green
  3 - 3
  4 - Blue
  5 - 5
  6 - 6
  7 - 7
  8 - 8

All possible combinations of values of an
Enum with FlagsAttribute:

  0 - Black
  1 - Red
  2 - Green
  3 - Red, Green
  4 - Blue
  5 - Red, Blue
  6 - Green, Blue
  7 - Red, Green, Blue
  8 - 8
*/