TSingleHelper¶

Helper for Single floating point type.

Declaration¶

Source position: syshelph.inc line 669

type

  TSingleHelper = type helper for Single
  public
    const
      Epsilon : Single = 1.4012984643248170709e-45;
      MachineEpsilon : Single = 1.1920928955078125e-7;
      MaxValue : Single = 340282346638528859811704183484516925440.0;
      MinValue : Single = - 340282346638528859811704183484516925440.0;
      PositiveInfinity : Single = 1.0 / 0.0;
      NegativeInfinity : Single = (- 1.0) / (0.0);
      NaN : Single = 0.0 / 0.0;
    class function IsNan(const AValue: Single) : Boolean; overload;
    function IsNan : Boolean; overload;
    class function IsInfinity(const AValue: Single) : Boolean; overload;
    function IsInfinity : Boolean; overload;
    class function IsNegativeInfinity(const AValue: Single) : Boolean; overload;
    function IsNegativeInfinity : Boolean; overload;
    class function IsPositiveInfinity(const AValue: Single) : Boolean; overload;
    function IsPositiveInfinity : Boolean; overload;
    class function Parse(const AString: string) : Single; overload;
    class function Parse(const AString: string; 
                    const AFormatSettings: TFormatSettings) : Single; overload;
    class function Size : Integer;
    class function ToString(const AValue: Single) : string; overload;
    class function ToString(const AValue: Single; 
                       const AFormatSettings: TFormatSettings) : string; overload;
    class function ToString(const AValue: Single; 
                       const AFormat: TFloatFormat; 
                       const APrecision: Integer; 
                       const ADigits: Integer) : string; overload;
    class function ToString(const AValue: Single; 
                       const AFormat: TFloatFormat; 
                       const APrecision: Integer; 
                       const ADigits: Integer; 
                       const AFormatSettings: TFormatSettings) : string; overload;
    function ToString(const AFormat: TFloatFormat; 
                 const APrecision: Integer; const ADigits: Integer)
                  : string; overload;
    function ToString(const AFormat: TFloatFormat; 
                 const APrecision: Integer; const ADigits: Integer; 
                 const AFormatSettings: TFormatSettings) : string; overload;
    function ToString(const AFormatSettings: TFormatSettings) : string; overload;
    function ToString : string; overload;
    class function TryParse(const AString: string; out AValue: Single)
                        : Boolean; overload;
    class function TryParse(const AString: string; out AValue: Single; 
                       const AFormatSettings: TFormatSettings) : Boolean; overload;
    procedure BuildUp;
    function Exponent : Integer;
    function Fraction : Extended;
    function Mantissa : QWord;
    function SpecialType : TFloatSpecial;
    property Bytes[AIndex : Cardinal]: Byte; {rw}
    property Words[AIndex : Cardinal]: Word; {rw}
    property Sign: Boolean; {rw}
    property Exp: QWord; {rw}
    property Frac: QWord; {rw}
  end;

Inheritance¶

TSingleHelper

Description¶

TSingleHelper is the helper type for the single-sized floating point type. It contains some conversion methods, as well as access to the low-level structure of the floating-point representation of a single.

Properties¶

Member	Visibility	Description
Bytes	public	Indexed access to the individual bytes of the floating point value.
Exp	public	The bit pattern of the exponent as stored in memory.
Frac	public	Bitpattern that makes up the fractional part.
Sign	public	Sign of the floating point value.
Words	public	Indexed access to the words that make up the floating point value.

Methods¶

Member	Visibility	Description
BuildUp	public	Build a single-sized floating point from its composing parts.
Exponent	public	Exponent of the floating-point value.
Fraction	public	Fraction of the floating-point value.
IsInfinity	public	Check whether a value is positive or negative infinity.
IsNan	public	Check whether a value equals NaN.
IsNegativeInfinity	public	Check whether a value is negative infinity.
IsPositiveInfinity	public	Check whether a value is positive infinity.
Mantissa	public	Mantissa of the floating-point.
Parse	public	Convert a string to a floating point value.
Size	public	Size (in bytes) of a single-sized floating point value.
SpecialType	public	Return the type of the single-sized floating point value.
ToString	public	Convert a single-sized floating point value to a string.
TryParse	public	Try to convert a string to a single-sized floating point value.

Name	Description
TDoubleHelper	Helper for Double floating point type.
TExtendedHelper	Helper for Extended floating point type.