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Exploring the C# Library
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static void Main() { Queue q = new Queue(); foreach(int i in q) ConsoleWrite(i + " "); ConsoleWriteLine(); ShowEnq(q, 22); ShowEnq(q, 65); ShowEnq(q, 91); ShowDeq(q); ShowDeq(q); ShowDeq(q); try { ShowDeq(q); } catch (InvalidOperationException) { ConsoleWriteLine("Queue empty"); } } }
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Enqueue(22) queue: 22 Enqueue(65) queue: 22 65 Enqueue(91) queue: 22 65 91 Dequeue -> 22 queue: 65 91 Dequeue -> 65 queue: 91 Dequeue -> 91 queue: Dequeue -> Queue empty
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Storing Bits with BitArray
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The BitArray class supports a collection of bits Because it stores bits rather than objects, BitArray has capabilities different from those of the other collections However, it still supports the basic collection underpinning by implementing ICollection and IEnumerable It also implements ICloneable BitArray defines several constructors You can construct a BitArray from an array of Boolean values using this constructor: public BitArray(bool[ ] values) In this case, each element of values becomes a bit in the collection Thus, each bit in the collection corresponds to an element of values Furthermore, the ordering of the elements of values and the bits in the collection are the same
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25:
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You can create a BitArray from an array of bytes using this constructor: public BitArray(byte[ ] bytes) Here, the bit pattern in bytes becomes the bits in the collection, with bytes[0] specifying the first 8 bits, bytes[1] specifying the second 8 bits, and so on In similar fashion, you can construct a BitArray from an array of ints using this constructor: public BitArray(int[ ] values) In this case, values[0] specifies the first 32 bits, values[1] specifies the second 32 bits, and so on You can create a BitArray of a specific size using this constructor:
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PART II
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public BitArray(int length) Here, length specifies the number of bits The bits in the collection are initialized to false To specify a size and initial value of the bits, use the following constructor: public BitArray(int length, bool defaultValue) In this case, all bits in the collection will be set to the value passed in defaultValue Finally, you can create a new BitArray from an existing one by using this constructor: public BitArray(BitArray bits) The new object will contain the same collection of bits as bits, but the two collections will be otherwise separate BitArrays can be indexed Each index specifies an individual bit, with an index of zero indicating the low-order bit In addition to the methods specified by the interfaces that it implements, BitArray defines the methods shown in Table 25-9 Notice that BitArray does not supply a Synchronized( ) method Thus, a synchronized wrapper is not available, and the IsSynchronized property is always false However, you can control access to a BitArray by synchronizing on the object provided by SyncRoot
Method public BitArray And(BitArray value) public bool Get(int index) public BitArray Not( ) public BitArray Or(BitArray value) public void Set(int index, bool value) public void SetAll(bool value) public BitArray Xor(BitArray value)
Description ANDs the bits of the invoking object with those specified by value and returns a BitArray that contains the result Returns the value of the bit at the index specified by index Performs a bitwise, logical NOT on the invoking collection and returns a BitArray that contains the result ORs the bits of the invoking object with those specified by value and returns a BitArray that contains the result Sets the bit at the index specified by index to value Sets all bits to value XORs the bits of the invoking object with those specified by value and returns a BitArray that contains the result
TABLE 25-9
The Methods De ned by BitArray
Part II:
Exploring the C# Library
To the properties specified by the interfaces that it implements, BitArray adds Length, which is shown here: public int Length { get; set; } Length sets or obtains the number of bits in the collection Thus, Length gives the same value as does the standard Count property, which is defined for all collections However, Count is read-only, but Length is not Thus, Length can be used to change the size of a BitArray If you shorten a BitArray, bits are truncated from the high-order end If you lengthen a BitArray, false bits are added to the high-order end BitArray defines the following indexer: public bool this[int index] { get; set; } You can use this indexer to get or set the value of an element Here is an example that demonstrates BitArray:
// Demonstrate BitArray using System; using SystemCollections; class BADemo { public static void ShowBits(string rem, BitArray bits) { ConsoleWriteLine(rem); for(int i=0; i < bitsCount; i++) ConsoleWrite("{0, -6} ", bits[i]); ConsoleWriteLine("\n"); } static void Main() { BitArray ba = new BitArray(8); byte[] b = { 67 }; BitArray ba2 = new BitArray(b); ShowBits("Original contents of ba:", ba); ba = baNot(); ShowBits("Contents of ba after Not:", ba); ShowBits("Contents of ba2:", ba2); BitArray ba3 = baXor(ba2); ShowBits("Result of ba XOR ba2:", ba3); } }
The output is shown here:
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