[Properties (by Name)] [Methods (by Name)] [Events (by Name)]
Class to store collections of bits (binary values that can be 0 or 1).
Source position: classesh.inc line 667
type TBits = class(TObject) |
||
public |
||
constructor Create(); virtual; |
|
Creates a new bits collection. |
destructor Destroy; override; |
|
Destroys a bit collection. |
function GetFSize; |
|
Returns the number of records used to store the bits. |
procedure SetOn(); |
|
Turn a particular bit on. |
procedure Clear(); |
|
Clears a particular bit. |
procedure Clearall; |
|
Clears all bits in the array. |
procedure CopyBits(); |
|
Copy bits from one bits set to another. |
procedure AndBits(); |
|
Performs an and operation on the bits. |
procedure OrBits(); |
|
Performs an or operation on the bits. |
procedure XorBits(); |
|
Performs a xor operation on the bits. |
procedure NotBits(); |
|
Performs a not operation on the bits. |
function Get(); |
|
Retrieve the value of a particular bit. |
procedure Grow(); |
|
Expands the bits array to the requested size. |
function Equals(); |
|
Determines whether the bits of 2 arrays are equal. |
procedure SetIndex(); |
|
Sets the start position for FindNextBit and FindPrevBit. |
function FindFirstBit(); |
|
Find first bit with a particular value. |
function FindNextBit; |
|
Searches the next bit with a particular value. |
function FindPrevBit; |
|
Searches the previous bit with a particular value. |
function OpenBit; |
|
Returns the position of the first bit that is set to False. |
property Bits []: Boolean; default; [rw] |
|
Access to all bits in the array. |
|
Current size of the array of bits. |
|
end; |
|
Class to store collections of bits (binary values that can be 0 or 1). |
|
| | ||
|
Base class of all classes. |
TBits can be used to store collections of bits in an indexed array. This is especially useful for storing collections of booleans: Normally the size of a boolean is the size of the smallest enumerated type, i.e. 1 byte. Since a bit can take 2 values it can be used to store a boolean as well. Since TBits can store 8 bits in a byte, it takes 8 times less space to store an array of booleans in a TBits class then it would take to store them in a conventional array.
TBits introduces methods to store and retrieve bit values, apply masks, and search for bits.