Gray::cFloatDeco Class Reference

#include <cFloatDeco.h>

Public Member Functions
	cFloatDeco () noexcept
	cFloatDeco (UINT64 uMan, int iExp2) noexcept
	cFloatDeco (double d) noexcept
cFloatDeco	operator- (const cFloatDeco &rhs) const
cFloatDeco	operator* (const cFloatDeco &rhs) const
cFloatDeco	Normalize () const
void	NormalizedBoundaries (cFloatDeco *minus, cFloatDeco *plus) const

Static Public Member Functions
static unsigned	GetCountDecimalDigit32 (UINT32 n) noexcept
static cFloatDeco __stdcall	GetCachedPower (int nExp2, OUT int *pnExp10)
static double __stdcall	toDouble (UINT32 frac1, UINT32 frac2, int nExp10)
static void __stdcall	GrisuRound (char *pszOut, StrLen_t len, UINT64 delta, UINT64 rest, UINT64 ten_kappa, UINT64 wp_w)
static StrLen_t __stdcall	Grisu2 (double dVal, char *pszOut, OUT int *pnExp10)
static StrLen_t __stdcall	MantRound (char *pszOut, StrLen_t nMantLength)
static StrLen_t __stdcall	MantAdjust (char *pszOut, StrLen_t nMantLength, StrLen_t nMantLengthNew)
static StrLen_t __stdcall	FormatE (char *pszOut, StrLen_t nMantLength, int nExp10, char chE)
static StrLen_t __stdcall	FormatF (char *pszOut, StrLen_t nMantLength, int nExp10, int iDecPlacesWanted)

Public Attributes
UINT64	m_uMant
	Hold Mantissa. More...
int	m_iExp2
	Hold base 2 Biased Exponent. More...

Static Public Attributes
static const double	k_PowersOf10 [9]
	Table giving binary powers of 10. More...
static const UINT32	k_Exp10 [10]
	Table of decimal digits to fit in 32 bit space. More...
static const UINT64	k_MANT_MASK_X = 0x0010000000000000ULL

Detailed Description

holds a decomposed double/float value. ignore sign. Support class for conversion of double/float to string. Used with cFloat64

Constructor & Destructor Documentation

cFloatDeco() [1/3]

Gray::cFloatDeco::cFloatDeco ( )

inlinenoexcept

cFloatDeco() [2/3]

Gray::cFloatDeco::cFloatDeco ( UINT64  uMan, int  iExp2  )

inlinenoexcept

cFloatDeco() [3/3]

Gray::cFloatDeco::cFloatDeco ( double  d )

inlinenoexcept

Decompose d.

Member Function Documentation

FormatE()

StrLen_t Gray::cFloatDeco::FormatE ( char *  pszOut, StrLen_t  nMantLength, int  nExp10, char  chE  )

static

like ecvt() using e exponent.

• pszOut = string to contains digits.
• chE = 'e' or 'E'

FormatF()

StrLen_t Gray::cFloatDeco::FormatF ( char *  pszOut, StrLen_t  nMantLength, int  nExp10, int  iDecPlacesWanted  )

static

like fcvt(). Might be k_LEN_MAX_DIGITS digits long.

• pszOut contains digits.

GetCachedPower()

cFloatDeco Gray::cFloatDeco::GetCachedPower ( int  nExp2, OUT int *  pnExp10  )

static

opposite of k_PowersOf10 10^-348, 10^-340, ..., 10^340, stepped by 8.

GetCountDecimalDigit32()

static unsigned Gray::cFloatDeco::GetCountDecimalDigit32 ( UINT32  n )

inlinestaticnoexcept

How many decimal digits? k_Exp10 Simple C++ implementation is faster than Highest1Bit/__builtin_clz version in this case.

Grisu2()

StrLen_t Gray::cFloatDeco::Grisu2 ( double  dVal, char *  pszOut, OUT int *  pnExp10  )

static

GrisuRound()

void Gray::cFloatDeco::GrisuRound ( char *  pszOut, StrLen_t  len, UINT64  delta, UINT64  rest, UINT64  ten_kappa, UINT64  wp_w  )

static

Round last digit down?

MantAdjust()

StrLen_t Gray::cFloatDeco::MantAdjust ( char *  pszOut, StrLen_t  nMantLength, StrLen_t  nMantLengthNew  )

static

Change mantissa size up or down.

Returns

size change.

MantRound()

StrLen_t Gray::cFloatDeco::MantRound ( char *  pszOut, StrLen_t  nMantLength  )

static

Normalize()

cFloatDeco Gray::cFloatDeco::Normalize ( ) const

inline

Fix m_iExp2 by making m_uMant as large as possible. cBits::Highest1Bit<>

NormalizedBoundaries()

void Gray::cFloatDeco::NormalizedBoundaries ( cFloatDeco *  minus, cFloatDeco *  plus  ) const

inline

operator*()

cFloatDeco Gray::cFloatDeco::operator* ( const cFloatDeco &  rhs ) const

inline

Do math on decomposed numbers.

mult_round

operator-()

cFloatDeco Gray::cFloatDeco::operator- ( const cFloatDeco &  rhs ) const

inline

Do math on decomposed number. ASSUME same m_iExp2

toDouble()

double GRAYCALL Gray::cFloatDeco::toDouble ( UINT32  frac1, UINT32  frac2, int  nExp10  )

static

Member Data Documentation

k_Exp10

const UINT32 Gray::cFloatDeco::k_Exp10

static

Initial value:

=
        {
                
                1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 100000000, 1000000000
        }

Table of decimal digits to fit in 32 bit space.

k_MANT_MASK_X

const UINT64 Gray::cFloatDeco::k_MANT_MASK_X = 0x0010000000000000ULL

static

k_PowersOf10

const double Gray::cFloatDeco::k_PowersOf10

static

Initial value:

=       
        {
                10.0,                   
                100.0,                  
                1.0e4,                  
                1.0e8,
                1.0e16,
                1.0e32,
                1.0e64,
                1.0e128,
                1.0e256
        }

Table giving binary powers of 10.

m_iExp2

int Gray::cFloatDeco::m_iExp2

Hold base 2 Biased Exponent.

m_uMant

UINT64 Gray::cFloatDeco::m_uMant

Hold Mantissa.

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The documentation for this class was generated from the following files:

• c:/Dennis/Source/Gray/GrayCore/include/cFloatDeco.h
• c:/Dennis/Source/Gray/GrayCore/src/cFloatDeco.cpp