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BitVector.pas
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BitVector.pas
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{-------------------------------------------------------------------------------
This Source Code Form is subject to the terms of the Mozilla Public
License, v. 2.0. If a copy of the MPL was not distributed with this
file, You can obtain one at http://mozilla.org/MPL/2.0/.
-------------------------------------------------------------------------------}
{===============================================================================
BitVector
Provides classes that can be used to access individual bits of memory in
a list-like manner.
Version 1.4.3 (2024-04-14)
Last change 2024-04-14
©2015-2024 František Milt
Contacts:
František Milt: [email protected]
Support:
If you find this code useful, please consider supporting its author(s) by
making a small donation using the following link(s):
https://www.paypal.me/FMilt
Changelog:
For detailed changelog and history please refer to this git repository:
github.com/TheLazyTomcat/Lib.BitVector
Dependencies:
AuxClasses - github.com/TheLazyTomcat/Lib.AuxClasses
* AuxExceptions - github.com/TheLazyTomcat/Lib.AuxExceptions
AuxTypes - github.com/TheLazyTomcat/Lib.AuxTypes
* BinaryStreamingLite - github.com/TheLazyTomcat/Lib.BinaryStreamingLite
BitOps - github.com/TheLazyTomcat/Lib.BitOps
StrRect - github.com/TheLazyTomcat/Lib.StrRect
Library AuxExceptions is required only when rebasing local exception classes
(see symbol BitVector_UseAuxExceptions for details).
BinaryStreamingLite can be replaced by full BinaryStreaming.
Library AuxExceptions might also be required as an indirect dependency.
Indirect dependencies:
BasicUIM - github.com/TheLazyTomcat/Lib.BasicUIM
SimpleCPUID - github.com/TheLazyTomcat/Lib.SimpleCPUID
UInt64Utils - github.com/TheLazyTomcat/Lib.UInt64Utils
WinFileInfo - github.com/TheLazyTomcat/Lib.WinFileInfo
===============================================================================}
unit BitVector;
{
BitVector_UseAuxExceptions
If you want library-specific exceptions to be based on more advanced classes
provided by AuxExceptions library instead of basic Exception class, and don't
want to or cannot change code in this unit, you can define global symbol
BitVector_UseAuxExceptions to achieve this.
}
{$IF Defined(BitVector_UseAuxExceptions)}
{$DEFINE UseAuxExceptions}
{$IFEND}
//------------------------------------------------------------------------------
{$IFDEF FPC}
{$MODE ObjFPC}
{$MODESWITCH DuplicateLocals+}
{$MODESWITCH ClassicProcVars+}
{$INLINE ON}
{$DEFINE CanInline}
{$ELSE}
{$IF CompilerVersion >= 17} // Delphi 2005+
{$DEFINE CanInline}
{$ELSE}
{$UNDEF CanInline}
{$IFEND}
{$ENDIF}
{$H+}
interface
uses
SysUtils, Classes,
AuxTypes, AuxClasses{$IFDEF UseAuxExceptions}, AuxExceptions{$ENDIF};
{===============================================================================
Library-specific exceptions
===============================================================================}
type
EBVException = class({$IFDEF UseAuxExceptions}EAEGeneralException{$ELSE}Exception{$ENDIF});
EBVIndexOutOfBounds = class(EBVException);
EBVNonReallocatableMemory = class(EBVException);
EBVInvalidValue = class(EBVException);
{===============================================================================
--------------------------------------------------------------------------------
TBitVector
--------------------------------------------------------------------------------
===============================================================================}
type
TBVOperations = record
BoolOperation: Function(A,B: Boolean): Boolean;
ByteOperation: Function(A,B: Byte): Byte;
WordOperation: Function(A,B: NativeUInt): NativeUInt;
end;
{===============================================================================
TBitVector - class declaration
===============================================================================}
type
TBitVector = class(TCustomListObject)
protected
fConstructorSetup: Boolean; // to allow SetCount and SetCapacity in static vectors
fOwnsMemory: Boolean;
fMemSize: TMemSize;
fMemory: Pointer;
fCount: Integer;
fPopCount: Integer;
fStatic: Boolean; // when true, the memory cannot be reallocated, but can be written into
fChangeCounter: Integer;
fChanged: Boolean;
fOnChangeEvent: TNotifyEvent;
fOnChangeCallback: TNotifyCallback;
// following four methods do not check index for validity
Function GetBytePtrBitIdx(BitIndex: Integer): PByte; virtual;
Function GetBytePtrByteIdx(ByteIndex: Integer): PByte; virtual;
Function GetBit_LL(Index: Integer): Boolean; virtual;
Function SetBit_LL(Index: Integer; Value: Boolean): Boolean; virtual; // returns old value
Function GetBit(Index: Integer): Boolean; virtual;
procedure SetBit(Index: Integer; Value: Boolean); virtual;
Function GetCapacity: Integer; override;
procedure SetCapacity(Value: Integer); override;
Function GetCount: Integer; override;
procedure SetCount(Value: Integer); override;
Function MemoryCanBeReallocated: Boolean; virtual;
procedure ShiftDown(Idx1,Idx2: Integer); virtual;
procedure ShiftUp(Idx1,Idx2: Integer); virtual;
procedure ScanForPopCount; virtual;
procedure CombineInternal(Memory: Pointer; Count: Integer; Operations: TBVOperations); virtual;
procedure Initialize; virtual;
procedure Finalize; virtual;
procedure DoChange; virtual;
public
constructor Create(Memory: Pointer; Count: Integer); overload; virtual;
constructor Create(InitialCount: Integer = 0; InitialValue: Boolean = False); overload; virtual;
destructor Destroy; override;
procedure BeginChanging;
Function EndChanging: Integer;
Function LowIndex: Integer; override;
Function HighIndex: Integer; override;
Function First: Boolean; virtual;
Function Last: Boolean; virtual;
Function Add(Value: Boolean): Integer; virtual;
procedure Insert(Index: Integer; Value: Boolean); virtual;
procedure Exchange(Index1, Index2: Integer); virtual;
procedure Move(SrcIdx, DstIdx: Integer); virtual;
procedure Delete(Index: Integer); virtual;
procedure Clear; virtual;
procedure Assign(Memory: Pointer; Count: Integer); overload; virtual;
procedure Assign(Vector: TBitVector); overload; virtual;
procedure Append(Memory: Pointer; Count: Integer); overload; virtual;
procedure Append(Vector: TBitVector); overload; virtual;
procedure Put(Index: Integer; Memory: Pointer; Count: Integer); overload; virtual;
procedure Put(Index: Integer; Vector: TBitVector); overload; virtual;
procedure Fill(FromIdx,ToIdx: Integer; Value: Boolean); overload; virtual;
procedure Fill(Value: Boolean); overload; virtual;
procedure Complement(FromIdx,ToIdx: Integer); overload; virtual;
procedure Complement; overload; virtual;
procedure Reverse; virtual;
procedure Combine(Memory: Pointer; Count: Integer; Operations: TBVOperations); overload; virtual;
procedure Combine(Vector: TBitVector; Operations: TBVOperations); overload; virtual;
procedure CombineAND(Memory: Pointer; Count: Integer); overload; virtual;
procedure CombineAND(Vector: TBitVector); overload; virtual;
procedure CombineOR(Memory: Pointer; Count: Integer); overload; virtual;
procedure CombineOR(Vector: TBitVector); overload; virtual;
procedure CombineXOR(Memory: Pointer; Count: Integer); overload; virtual;
procedure CombineXOR(Vector: TBitVector); overload; virtual;
Function IsEmpty: Boolean; virtual;
Function IsFull: Boolean; virtual;
Function IsEqual(Vector: TBitVector): Boolean; virtual;
Function FirstSet: Integer; virtual;
Function FirstClean: Integer; virtual;
Function LastSet: Integer; virtual;
Function LastClean: Integer; virtual;
procedure WriteToStream(Stream: TStream); virtual;
procedure ReadFromStream(Stream: TStream); virtual;
procedure SaveToStream(Stream: TStream); virtual;
procedure LoadFromStream(Stream: TStream); virtual;
procedure WriteToFile(const FileName: String); virtual;
procedure ReadFromFile(const FileName: String); virtual;
procedure SaveToFile(const FileName: String); virtual;
procedure LoadFromFile(const FileName: String); virtual;
property Bits[Index: Integer]: Boolean read GetBit write SetBit; default;
property OwnsMemory: Boolean read fOwnsMemory;
property MemorySize: TMemSize read fMemSize;
property Memory: Pointer read fMemory;
property PopCount: Integer read fPopCount;
property Static: Boolean read fStatic;
property OnChange: TNotifyEvent read fOnChangeEvent write fOnChangeEvent;
property OnChangeEvent: TNotifyEvent read fOnChangeEvent write fOnChangeEvent;
property OnChangeCallback: TNotifyCallback read fOnChangeCallback write fOnChangeCallback;
end;
{===============================================================================
--------------------------------------------------------------------------------
TBitVectorStatic
--------------------------------------------------------------------------------
===============================================================================}
{===============================================================================
TBitVectorStatic - class declaration
===============================================================================}
type
TBitVectorStatic = class(TBitVector)
protected
procedure Initialize; override;
end;
{===============================================================================
--------------------------------------------------------------------------------
TBitVectorStatic32
--------------------------------------------------------------------------------
===============================================================================}
{===============================================================================
TBitVectorStatic32 - class declaration
===============================================================================}
type
TBitVectorStatic32 = class(TBitVectorStatic)
public
constructor Create(Memory: Pointer; Count: Integer); overload; override;
constructor Create(InitialCount: Integer = 0; InitialValue: Boolean = False); overload; override;
Function FirstSet: Integer; override;
Function FirstClean: Integer; override;
Function LastSet: Integer; override;
Function LastClean: Integer; override;
end;
implementation
uses
Math,
BitOps, StrRect, BinaryStreamingLite;
{===============================================================================
--------------------------------------------------------------------------------
TBitVector
--------------------------------------------------------------------------------
===============================================================================}
{===============================================================================
TBitVector - auxiliaty types, constants and functions
===============================================================================}
const
BV_ALLOCDELTA_BITS = 128; // allocation granularity
BV_ALLOCDELTA_BYTES = BV_ALLOCDELTA_BITS div 8;
{$IF SizeOf(NativeUInt) = 8}
BV_NATINT_BYTES = 8;
BV_NATINT_BITS = 64;
BV_NATINT_MAX = NativeUInt($FFFFFFFFFFFFFFFF);
{$ELSEIF SizeOf(NativeUInt) = 4}
BV_NATINT_BYTES = 4;
BV_NATINT_BITS = 32;
BV_NATINT_MAX = NativeUInt($FFFFFFFF);
{$ELSE}
{$MESSAGE FATAL 'Unsupported architecture.'}
{$IFEND}
//==============================================================================
Function BoolFillValue(Value: Boolean): NativeUInt;
begin
If Value then
Result := BV_NATINT_MAX
else
Result := 0;
end;
//------------------------------------------------------------------------------
Function BoolOperation_AND(A,B: Boolean): Boolean;
begin
Result := A and B;
end;
//------------------------------------------------------------------------------
Function BoolOperation_OR(A,B: Boolean): Boolean;
begin
Result := A or B;
end;
//------------------------------------------------------------------------------
Function BoolOperation_XOR(A,B: Boolean): Boolean;
begin
Result := A xor B;
end;
//------------------------------------------------------------------------------
Function ByteOperation_AND(A,B: Byte): Byte;
begin
Result := A and B;
end;
//------------------------------------------------------------------------------
Function ByteOperation_OR(A,B: Byte): Byte;
begin
Result := A or B;
end;
//------------------------------------------------------------------------------
Function ByteOperation_XOR(A,B: Byte): Byte;
begin
Result := A xor B;
end;
//------------------------------------------------------------------------------
Function WordOperation_AND(A,B: NativeUInt): NativeUInt;
begin
Result := A and B;
end;
//------------------------------------------------------------------------------
Function WordOperation_OR(A,B: NativeUInt): NativeUInt;
begin
Result := A or B;
end;
//------------------------------------------------------------------------------
Function WordOperation_XOR(A,B: NativeUInt): NativeUInt;
begin
Result := A xor B;
end;
//==============================================================================
const
AndOps: TBVOperations = (
BoolOperation: BoolOperation_AND;
ByteOperation: ByteOperation_AND;
WordOperation: WordOperation_AND);
OrOps: TBVOperations = (
BoolOperation: BoolOperation_OR;
ByteOperation: ByteOperation_OR;
WordOperation: WordOperation_OR);
XorOps: TBVOperations = (
BoolOperation: BoolOperation_XOR;
ByteOperation: ByteOperation_XOR;
WordOperation: WordOperation_XOR);
//==============================================================================
// endianness correction
Function EndCor32(Value: UInt32): UInt32; {$IFDEF CanInline} inline;{$ENDIF}
begin
{$IFDEF ENDIAN_BIG}
Result := EndianSwap(Value);
{$ELSE}
Result := Value;
{$ENDIF}
end;
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Function EndCor(Value: NativeUInt): NativeUInt; {$IFDEF CanInline} inline;{$ENDIF}
begin
{$IFDEF ENDIAN_BIG}
Result := EndianSwap(Value);
{$ELSE}
Result := Value;
{$ENDIF}
end;
{===============================================================================
TBitVector - class implementation
===============================================================================}
{-------------------------------------------------------------------------------
TBitVector - protected methods
-------------------------------------------------------------------------------}
Function TBitVector.GetBytePtrBitIdx(BitIndex: Integer): PByte;
begin
Result := PByte(PtrAdvance(fMemory,PtrInt(BitIndex shr 3)));
end;
//------------------------------------------------------------------------------
Function TBitVector.GetBytePtrByteIdx(ByteIndex: Integer): PByte;
begin
Result := PByte(PtrAdvance(fMemory,PtrInt(ByteIndex)));
end;
//------------------------------------------------------------------------------
Function TBitVector.GetBit_LL(Index: Integer): Boolean;
begin
Result := BT(GetBytePtrBitIdx(Index)^,Index and 7);
end;
//------------------------------------------------------------------------------
Function TBitVector.SetBit_LL(Index: Integer; Value: Boolean): Boolean;
begin
Result := BitSetTo(GetBytePtrBitIdx(Index)^,Index and 7,Value);
end;
//------------------------------------------------------------------------------
Function TBitVector.GetBit(Index: Integer): Boolean;
begin
If CheckIndex(Index) then
Result := GetBit_LL(Index)
else
raise EBVIndexOutOfBounds.CreateFmt('TBitVector.GetBit: Index (%d) out of bounds.',[Index]);
end;
//------------------------------------------------------------------------------
procedure TBitVector.SetBit(Index: Integer; Value: Boolean);
begin
If CheckIndex(Index) then
begin
If Value <> SetBit_LL(Index,Value) then
begin
If Value then
Inc(fPopCount)
else
Dec(fPopCount);
DoChange;
end;
end
else raise EBVIndexOutOfBounds.CreateFmt('TBitVector.SetBit: Index (%d) out of bounds.',[Index]);
end;
//------------------------------------------------------------------------------
Function TBitVector.GetCapacity: Integer;
begin
Result := Integer(fMemSize shl 3);
end;
//------------------------------------------------------------------------------
procedure TBitVector.SetCapacity(Value: Integer);
var
NewMemSize: TMemSize;
begin
If MemoryCanBeReallocated then
begin
If Value >= 0 then
begin
NewMemSize := Ceil(Value / BV_ALLOCDELTA_BITS) * BV_ALLOCDELTA_BYTES;
If fMemSize <> NewMemSize then
begin
ReallocMem(fMemory,NewMemSize);
fMemSize := NewMemSize;
// adjust count if capacity gets below it
If Capacity < fCount then
begin
fCount := Capacity;
ScanForPopCount;
DoChange;
end;
end;
end
else raise EBVInvalidValue.CreateFmt('TBitVector.SetCapacity: Invalid capacity (%d).',[Value]);
end
else raise EBVNonReallocatableMemory.Create('TBitVector.SetCapacity: Memory cannot be reallocated.');
end;
//------------------------------------------------------------------------------
Function TBitVector.GetCount: Integer;
begin
Result := fCount;
end;
//------------------------------------------------------------------------------
procedure TBitVector.SetCount(Value: Integer);
var
i: Integer;
begin
If MemoryCanBeReallocated then
begin
If Value >= 0 then
begin
If Value <> fCount then
begin
BeginChanging;
try
If Value > Capacity then
SetCapacity(Value); // alloc new capacity
If Value > fCount then
begin
// add new bits, and reset them (pop count is not changed)
// partial byte...
If (fCount and 7) <> 0 then
SetBitsValue(GetBytePtrBitIdx(Pred(fCount))^,0,fCount and 7,7,False);
// full bytes...
For i := ((fCount + 7) shr 3) to (Pred(Value) shr 3) do
GetBytePtrByteIdx(i)^ := 0;
fCount := Value;
end
else
begin
// remove existing bits
fCount := Value;
ScanForPopCount;
end;
DoChange;
finally
EndChanging;
end;
end;
end
else raise EBVInvalidValue.CreateFmt('TBitVector.SetCount: Invalid count (%d).',[Value]);;
end
else raise EBVNonReallocatableMemory.Create('TBitVector.SetCount: Memory cannot be reallocated.');
end;
//------------------------------------------------------------------------------
Function TBitVector.MemoryCanBeReallocated: Boolean;
begin
Result := (fOwnsMemory and not fStatic) or fConstructorSetup;
end;
//------------------------------------------------------------------------------
procedure TBitVector.ShiftDown(Idx1,Idx2: Integer);
var
ByteCount: Integer;
Carry: Boolean;
MovingPtr: Pointer;
begin
If Idx2 > Idx1 then
begin
If (Idx1 shr 3) <> (Idx2 shr 3) then
begin
// shift is done across at least one byte boundary
ByteCount := Pred((Idx2 shr 3) - (Idx1 shr 3));
MovingPtr := GetBytePtrBitIdx(Idx2);
// shift last byte and preserve shifted-out bit
Carry := GetBit_LL(Idx2 and not 7); // bit 0 of last byte
SetBitsValue(PByte(MovingPtr)^,PByte(MovingPtr)^ shr 1,0,Idx2 and 7,False);
// shift native words
while ByteCount >= BV_NATINT_BYTES do
begin
Dec(PNativeUInt(MovingPtr));
Dec(ByteCount,BV_NATINT_BYTES);
PNativeUInt(MovingPtr)^ := EndCor(RCRCarry(EndCor(PNativeUInt(MovingPtr)^),1,Carry));
end;
// shift whole bytes
while ByteCount > 0 do
begin
Dec(PByte(MovingPtr));
Dec(ByteCount);
RCRValueCarry(PByte(MovingPtr)^,1,Carry);
end;
// shift first byte and store carry
Dec(PByte(MovingPtr));
SetBitsValue(PByte(MovingPtr)^,PByte(MovingPtr)^ shr 1,Idx1 and 7,7,False);
SetBit_LL(Idx1 or 7,Carry);
end
// shift is done within a single byte
else SetBitsValue(GetBytePtrBitIdx(Idx1)^,GetBytePtrBitIdx(Idx1)^ shr 1,Idx1 and 7,Idx2 and 7,False);
end
else raise EBVInvalidValue.CreateFmt('TBitVector.ShiftDown: Invalid indices (%d, %d).',[Idx1,Idx2]);
end;
//------------------------------------------------------------------------------
procedure TBitVector.ShiftUp(Idx1,Idx2: Integer);
var
ByteCount: Integer;
Carry: Boolean;
MovingPtr: Pointer;
begin
If Idx2 > Idx1 then
begin
If (Idx1 shr 3) <> (Idx2 shr 3) then
begin
// shift is done across at least one byte boundary
ByteCount := Pred((Idx2 shr 3) - (Idx1 shr 3));
MovingPtr := GetBytePtrBitIdx(Idx1);
// shift first byte and preserve shifted-out bit
Carry := GetBit_LL(Idx1 or 7);
SetBitsValue(PByte(MovingPtr)^,Byte(PByte(MovingPtr)^ shl 1),Idx1 and 7,7,False);
Inc(PByte(MovingPtr));
// shift native words
while ByteCount >= BV_NATINT_BYTES do
begin
PNativeUInt(MovingPtr)^ := EndCor(RCLCarry(EndCor(PNativeUInt(MovingPtr)^),1,Carry));
Inc(PNativeUInt(MovingPtr));
Dec(ByteCount,BV_NATINT_BYTES);
end;
// shift whole bytes
while ByteCount > 0 do
begin
RCLValueCarry(PByte(MovingPtr)^,1,Carry);
Inc(PByte(MovingPtr));
Dec(ByteCount);
end;
// shift last byte and store carry
SetBitsValue(PByte(MovingPtr)^,Byte(PByte(MovingPtr)^ shl 1),0,Idx2 and 7,False);
SetBit_LL(Idx2 and not 7,Carry);
end
// shift is done inside of one byte
else SetBitsValue(GetBytePtrBitIdx(Idx1)^,Byte(GetBytePtrBitIdx(Idx1)^ shl 1),Idx1 and 7,Idx2 and 7,False);
end
else raise EBVInvalidValue.CreateFmt('TBitVector.ShiftUp: Invalid indices (%d, %d).',[Idx1,Idx2]);
end;
//------------------------------------------------------------------------------
procedure TBitVector.ScanForPopCount;
var
BitCount: Integer;
MovingPtr: Pointer;
begin
fPopCount := 0;
BitCount := fCount;
If BitCount > 0 then
begin
MovingPtr := fMemory;
// full natives...
while BitCount >= BV_NATINT_BITS do
begin
Inc(fPopCount,BitOps.PopCount(PNativeUInt(MovingPtr)^));
Dec(BitCount,BV_NATINT_BITS);
Inc(PNativeUInt(MovingPtr));
end;
// full bytes...
while BitCount >= 8 do
begin
Inc(fPopCount,BitOps.PopCount(PByte(MovingPtr)^));
Dec(BitCount,8);
Inc(PByte(MovingPtr));
end;
// partial byte...
If BitCount > 0 then
Inc(fPopCount,BitOps.PopCount(Byte(PByte(MovingPtr)^ and ($FF shr (8 - (BitCount and 7))))));
end;
end;
//------------------------------------------------------------------------------
procedure TBitVector.CombineInternal(Memory: Pointer; Count: Integer; Operations: TBVOperations);
var
MovingPtr: Pointer;
TempA: Byte;
TempB: Byte;
TempR: Byte;
i: Integer;
begin
If Count > 0 then
begin
If Count > fCount then
Count := fCount;
MovingPtr := fMemory;
// combine whole natives
while Count >= BV_NATINT_BITS do
begin
PNativeUInt(MovingPtr)^ := Operations.WordOperation(PNativeUInt(MovingPtr)^,PNativeUInt(Memory)^);
Inc(PNativeUInt(Memory));
Inc(PNativeUInt(MovingPtr));
Dec(Count,BV_NATINT_BITS);
end;
// combine whole bytes
while Count >= 8 do
begin
PByte(MovingPtr)^ := Operations.ByteOperation(PByte(MovingPtr)^,PByte(Memory)^);
Inc(PByte(Memory));
Inc(PByte(MovingPtr));
Dec(Count,8);
end;
// combine remaining bits
If Count > 0 then
begin
TempA := PByte(MovingPtr)^;
TempB := PByte(Memory)^;
TempR := 0;
For i := 0 to Pred(Count) do
TempR := TempR or Byte(IfThen(Operations.BoolOperation(
((TempA shr i) and 1) <> 0,((TempB shr i) and 1) <> 0),1,0) shl i);
SetBitsValue(PByte(MovingPtr)^,TempR,0,Pred(Count and 7),False);
end;
ScanForPopCount;
DoChange;
end;
end;
//------------------------------------------------------------------------------
procedure TBitVector.Initialize;
begin
fConstructorSetup := False;
fOwnsMemory := True;
fMemSize := 0;
fMemory := nil;
fCount := 0;
fPopCount := 0;
fStatic := False;
fChangeCounter := 0;
fChanged := False;
fOnChangeEvent := nil;
fOnChangeCallback := nil;
end;
//------------------------------------------------------------------------------
procedure TBitVector.Finalize;
begin
If fOwnsMemory then
FreeMem(fMemory,fMemSize);
end;
//------------------------------------------------------------------------------
procedure TBitVector.DoChange;
begin
fChanged := True;
If (fChangeCounter <= 0) then
begin
If Assigned(fOnChangeEvent) then
fOnChangeEvent(Self)
else If Assigned(fOnChangeCallback) then
fOnChangeCallback(Self);
end;
end;
{-------------------------------------------------------------------------------
TBitVector - public methods
-------------------------------------------------------------------------------}
constructor TBitVector.Create(Memory: Pointer; Count: Integer);
begin
inherited Create;
Initialize;
fOwnsMemory := False;
fMemSize := (Count + 7) shr 3;
fMemory := Memory;
fCount := Count;
ScanForPopCount;
end;
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
constructor TBitVector.Create(InitialCount: Integer = 0; InitialValue: Boolean = False);
begin
inherited Create;
Initialize;
fOwnsMemory := True;
fConstructorSetup := True;
try
SetCount(InitialCount); // sets capacity and therefore also fMemSize and fMemory
finally
fConstructorSetup := False;
end;
{
No need to call Fill when InitialValue is false since the memory was
implicitly cleared in a call to SetCount.
}
If InitialValue then
Fill(True);
end;
//------------------------------------------------------------------------------
destructor TBitVector.Destroy;
begin
Finalize;
inherited;
end;
//------------------------------------------------------------------------------
procedure TBitVector.BeginChanging;
begin
If fChangeCounter <= 0 then
fChanged := False;
Inc(fChangeCounter);
end;
//------------------------------------------------------------------------------
Function TBitVector.EndChanging: Integer;
begin
Dec(fChangeCounter);
If fChangeCounter <= 0 then
begin
fChangeCounter := 0;
If fChanged then
DoChange;
end;
Result := fChangeCounter;
end;
//------------------------------------------------------------------------------
Function TBitVector.LowIndex: Integer;
begin
Result := 0;
end;
//------------------------------------------------------------------------------
Function TBitVector.HighIndex: Integer;
begin
Result := Pred(fCount);
end;
//------------------------------------------------------------------------------
Function TBitVector.First: Boolean;
begin
Result := GetBit(LowIndex);
end;
//------------------------------------------------------------------------------
Function TBitVector.Last: Boolean;
begin
Result := GetBit(HighIndex);
end;
//------------------------------------------------------------------------------
Function TBitVector.Add(Value: Boolean): Integer;
begin
If MemoryCanBeReallocated then
begin
Grow;
Inc(fCount);
SetBit_LL(HighIndex,Value);
If Value then
Inc(fPopCount);
Result := HighIndex;
DoChange;
end
else raise EBVNonReallocatableMemory.Create('TBitVector.Add: Memory cannot be reallocated.');
end;
//------------------------------------------------------------------------------
procedure TBitVector.Insert(Index: Integer; Value: Boolean);
begin
If MemoryCanBeReallocated then
begin
If CheckIndex(Index) then
begin
Grow;
Inc(fCount); // must be here because of shifting
ShiftUp(Index,HighIndex);
SetBit_LL(Index,Value);
If Value then
Inc(fPopCount);
DoChange;
end
else If Index = fCount then
Add(Value)
else
raise EBVIndexOutOfBounds.CreateFmt('TBitVector.Insert: Index (%d) out of bounds.',[Index]);
end
else raise EBVNonReallocatableMemory.Create('TBitVector.Insert: Memory cannot be reallocated.');
end;
//------------------------------------------------------------------------------
procedure TBitVector.Exchange(Index1,Index2: Integer);
begin
If Index1 <> Index2 then
begin
If not CheckIndex(Index1) then
raise EBVIndexOutOfBounds.CreateFmt('TBitVector.Exchange: Index #1 (%d) out of bounds.',[Index1]);
If not CheckIndex(Index2) then
raise EBVIndexOutOfBounds.CreateFmt('TBitVector.Exchange: Index #2 (%d) out of bounds.',[Index2]);
SetBit_LL(Index2,SetBit_LL(Index1,GetBit_LL(Index2)));
DoChange;
end;
end;
//------------------------------------------------------------------------------
procedure TBitVector.Move(SrcIdx, DstIdx: Integer);
var
Temp: Boolean;
begin
If SrcIdx <> DstIdx then
begin
If not CheckIndex(SrcIdx) then
raise EBVIndexOutOfBounds.CreateFmt('TBitVector.Exchange: Source index (%d) out of bounds.',[SrcIdx]);
If not CheckIndex(DstIdx) then
raise EBVIndexOutOfBounds.CreateFmt('TBitVector.Exchange: Destination index (%d) out of bounds.',[DstIdx]);
Temp := GetBit_LL(SrcIdx);
If SrcIdx < DstIdx then
ShiftDown(SrcIdx,DstIdx)
else
ShiftUp(DstIdx,SrcIdx);
SetBit_LL(DstIdx,Temp);
DoChange;
end;
end;
//------------------------------------------------------------------------------
procedure TBitVector.Delete(Index: Integer);
begin
If MemoryCanBeReallocated then
begin
If CheckIndex(Index) then
begin
If GetBit_LL(Index) then
Dec(fPopCount);
If Index < HighIndex then
ShiftDown(Index,HighIndex);
Dec(fCount);
Shrink;
DoChange;
end
else raise EBVIndexOutOfBounds.CreateFmt('TBitVector.Delete: Index (%d) out of bounds.',[Index]);
end
else raise EBVNonReallocatableMemory.Create('TBitVector.Delete: Memory cannot be reallocated.');
end;
//------------------------------------------------------------------------------
procedure TBitVector.Clear;
begin
If MemoryCanBeReallocated then
begin
fCount := 0;
fPopCount := 0;
Shrink;
DoChange;
end
else raise EBVNonReallocatableMemory.Create('TBitVector.Clear: Memory cannot be reallocated.');
end;
//------------------------------------------------------------------------------
procedure TBitVector.Assign(Memory: Pointer; Count: Integer);
begin
If MemoryCanBeReallocated or (Count = fCount) then
begin
BeginChanging;
try
If Count <> fCount then
SetCount(Count); // also sets fCount
// whole bytes
System.Move(Memory^,fMemory^,Count shr 3);
// remaining bits
If (Count and 7) <> 0 then
SetBitsValue(GetBytePtrByteIdx(Count shr 3)^,
PByte(PtrAdvance(Memory,PtrInt(Count shr 3)))^,
0,Pred(Count and 7),False);
ScanForPopCount;
DoChange;
finally
EndChanging;
end;
end
else raise EBVNonReallocatableMemory.Create('TBitVector.Assign: Memory cannot be reallocated.');
end;
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
procedure TBitVector.Assign(Vector: TBitVector);
begin
Assign(Vector.Memory,Vector.Count);
end;
//------------------------------------------------------------------------------
procedure TBitVector.Append(Memory: Pointer; Count: Integer);
var
BytesCount: Integer;
RShift: Integer;
LShift: Integer;
MovingPtr: Pointer;
NextBytePtr: Pointer;
begin
If MemoryCanBeReallocated then
begin
If Count > 0 then