BitVector32::CreateMask Method ()


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Creates the first mask in a series of masks that can be used to retrieve individual bits in a BitVector32 that is set up as bit flags.

Namespace:   System.Collections.Specialized
Assembly:  System (in System.dll)

static int CreateMask()

Return Value

Type: System::Int32

A mask that isolates the first bit flag in the BitVector32.

Use CreateMask() to create the first mask in a series and CreateMask(int) for all subsequent masks.

Multiple masks can be created to refer to the same bit flag.

The resulting mask isolates only one bit flag in the BitVector32. You can combine masks using the bitwise OR operation to create a mask that isolates multiple bit flags in the BitVector32.

Using a mask on a BitVector32 that is set up as sections might cause unexpected results.

This method is an O(1) operation.

The following code example shows how to create and use masks.

#using <system.dll>

using namespace System;
using namespace System::Collections::Specialized;
int main()
   // Creates and initializes a BitVector32 with all bit flags set to FALSE.
   BitVector32 myBV;

   // Creates masks to isolate each of the first five bit flags.
   int myBit1 = BitVector32::CreateMask();
   int myBit2 = BitVector32::CreateMask( myBit1 );
   int myBit3 = BitVector32::CreateMask( myBit2 );
   int myBit4 = BitVector32::CreateMask( myBit3 );
   int myBit5 = BitVector32::CreateMask( myBit4 );
   Console::WriteLine( "Initial:               \t {0}", myBV );

   // Sets the third bit to TRUE.
   myBV[ myBit3 ] = true;
   Console::WriteLine( "myBit3 = TRUE          \t {0}", myBV );

   // Combines two masks to access multiple bits at a time.
   myBV[ myBit4 + myBit5 ] = true;
   Console::WriteLine( "myBit4 + myBit5 = TRUE \t {0}", myBV );
   myBV[ myBit1 | myBit2 ] = true;
   Console::WriteLine( "myBit1 | myBit2 = TRUE \t {0}", myBV );

This code produces the following output.

Initial:                BitVector32 {00000000000000000000000000000000}
myBit3 = TRUE           BitVector32 {00000000000000000000000000000100}
myBit4 + myBit5 = TRUE  BitVector32 {00000000000000000000000000011100}
myBit1 | myBit2 = TRUE  BitVector32 {00000000000000000000000000011111}


Universal Windows Platform
Available since 10
.NET Framework
Available since 1.1
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