System.TDoubleRec
Delphi
TDoubleRec = packed record
private
aDouble: Double;
function InternalGetBytes(Index: Cardinal): UInt8; inline;
function InternalGetWords(Index: Cardinal): UInt16; inline;
procedure InternalSetBytes(Index: Cardinal; const Value: UInt8); inline;
procedure InternalSetWords(Index: Cardinal; const Value: UInt16); inline;
function GetBytes(Index: Cardinal): UInt8; inline;
function GetWords(Index: Cardinal): UInt16; inline;
procedure SetBytes(Index: Cardinal; const Value: UInt8); inline;
procedure SetWords(Index: Cardinal; const Value: UInt16); inline;
function GetExp: UInt64; inline;
function GetFrac: UInt64; inline;
function GetSign: Boolean; inline;
procedure SetExp(NewExp: UInt64);
procedure SetFrac(NewFrac: UInt64);
procedure SetSign(NewSign: Boolean);
public
function Exponent: Integer;
function Fraction: Extended;
function Mantissa: UInt64;
property Sign: Boolean read GetSign write SetSign;
property Exp: UInt64 read GetExp write SetExp;
property Frac: UInt64 read GetFrac write SetFrac;
function SpecialType: TFloatSpecial;
procedure BuildUp(const SignFlag: Boolean; const Mantissa: UInt64; const Exponent: Integer);
class operator Explicit(a: Extended): TDoubleRec; inline;
class operator Explicit(a: TDoubleRec): Extended; inline;
property Bytes[Index: Cardinal]: UInt8 read GetBytes write SetBytes; // 0..7
property Words[Index: Cardinal]: UInt16 read GetWords write SetWords; // 0..3
end deprecated 'Use TDoubleHelper';
C++
struct DECLSPEC_DRECORD TDoubleRec
{
private:
double aDouble;
Byte __fastcall InternalGetBytes(unsigned Index);
Word __fastcall InternalGetWords(unsigned Index);
void __fastcall InternalSetBytes(unsigned Index, const Byte Value);
void __fastcall InternalSetWords(unsigned Index, const Word Value);
Byte __fastcall GetBytes(unsigned Index);
Word __fastcall GetWords(unsigned Index);
void __fastcall SetBytes(unsigned Index, const Byte Value);
void __fastcall SetWords(unsigned Index, const Word Value);
unsigned __int64 __fastcall GetExp(void);
unsigned __int64 __fastcall GetFrac(void);
bool __fastcall GetSign(void);
void __fastcall SetExp(unsigned __int64 NewExp);
void __fastcall SetFrac(unsigned __int64 NewFrac);
void __fastcall SetSign(bool NewSign);
public:
int __fastcall Exponent(void);
Extended __fastcall Fraction(void);
unsigned __int64 __fastcall Mantissa(void);
__property bool Sign = {read=GetSign, write=SetSign};
__property unsigned __int64 Exp = {read=GetExp, write=SetExp};
__property unsigned __int64 Frac = {read=GetFrac, write=SetFrac};
TFloatSpecial __fastcall SpecialType(void);
void __fastcall BuildUp(const bool SignFlag, const unsigned __int64 Mantissa, const int Exponent);
static TDoubleRec __fastcall _op_Explicit(Extended a);
__property Byte Bytes[unsigned Index] = {read=GetBytes, write=SetBytes};
__property Word Words[unsigned Index] = {read=GetWords, write=SetWords};
};
Properties
| Type | Visibility | Source | Unit | Parent |
|---|---|---|---|---|
record struct |
public | System.pas System.hpp |
System | System |
Description
Warning: TDoubleRec is deprecated. Please use SysUtils.TDoubleHelper.
Provides support for manipulating double precision floating-point values.
A TDoubleRec can be used to perform low-level operations on a double precision floating-point value. For example, the sign, the exponent, and the mantissa can be changed separately.
Note:
- To manipulate a double-precision floating-point data type, it is recommended that you use TDoubleHelper. However, TDoubleRec is not obsolete, and you can use TDoubleRec to allocate double-precision floating-point data.
- Beginning from XE3, the TDoubleRec.Bytes and TDoubleRec.Words properties are array properties. System.High and System.Low operators do not apply for array properties. You can use System.SizeOf instead, as shown in the example in TSingleRec.