System.TSingleRec
Delphi
TSingleRec = packed record
C++
struct DECLSPEC_DRECORD TSingleRec
{
private:
float aSingle;
UInt8 __fastcall InternalGetBytes(unsigned Index);
UInt16 __fastcall InternalGetWords(unsigned Index);
void __fastcall InternalSetBytes(unsigned Index, const UInt8 Value);
void __fastcall InternalSetWords(unsigned Index, const UInt16 Value);
UInt8 __fastcall GetBytes(unsigned Index);
UInt16 __fastcall GetWords(unsigned Index);
void __fastcall SetBytes(unsigned Index, const UInt8 Value);
void __fastcall SetWords(unsigned Index, const UInt16 Value);
unsigned __int64 __fastcall GetExp();
unsigned __int64 __fastcall GetFrac();
bool __fastcall GetSign();
void __fastcall SetExp(unsigned __int64 NewExp);
void __fastcall SetFrac(unsigned __int64 NewFrac);
void __fastcall SetSign(bool NewSign);
public:
int __fastcall Exponent();
Extended __fastcall Fraction();
unsigned __int64 __fastcall Mantissa();
__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 __fastcall BuildUp(const bool SignFlag, const unsigned __int64 Mantissa, const int Exponent);
static TSingleRec __fastcall _op_Explicit(Extended a);
__property UInt8 Bytes[unsigned Index] = {read=GetBytes, write=SetBytes};
__property UInt16 Words[unsigned Index] = {read=GetWords, write=SetWords};
};
Contents
Properties
| Type | Visibility | Source | Unit | Parent |
|---|---|---|---|---|
record struct |
public | System.pas System.hpp |
System | System |
Description
Attention: TSingleRec is deprecated. Please use SysUtils.TSingleHelper.
TSingleRec can perform low-level operations on a single precision floating-point value.
Beginning from XE3, the TSingleRec.Bytes and TSingleRec.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 following example.
Example
In the XE2 version of this example, System.High and System.Low were used for iterating byte by byte through the TSingleRec, like this:
for I := High(F.Bytes) downto Low(F.Bytes) do
In the XE3 example, System.SizeOf is used instead of High and Low:
var
F: TSingleRec;
I: Integer;
begin
F := TSingleRec(-0.5);
// display the hexadecimal representation of the single precision floating-point value
// leftmost bytes are the most significant
for I := sizeof(F) - 1 downto 0 do
Write(IntToHex(F.Bytes[I], 2) + ' ');
Writeln;
// display the value contained in the TSingleRec record
Writeln(FloatToStr(Single(F)));
// ...
Console output:
BF 00 00 00 -0.5