Double

#include <ieee754.h>

Collaboration diagram for Double:

Public Member Functions
	Double ()
	Double (double d)
	Double (uint64_t u)
double	Value () const
uint64_t	Uint64Value () const
double	NextPositiveDouble () const
bool	Sign () const
uint64_t	Significand () const
int	Exponent () const
bool	IsNan () const
bool	IsInf () const
bool	IsNanOrInf () const
bool	IsNormal () const
bool	IsZero () const
uint64_t	IntegerSignificand () const
int	IntegerExponent () const
uint64_t	ToBias () const

Static Public Member Functions
static int	EffectiveSignificandSize (int order)

Private Attributes
union {
double   d_
uint64_t   u_
};

Static Private Attributes
static const int	kSignificandSize = 52
static const int	kExponentBias = 0x3FF
static const int	kDenormalExponent = 1 - kExponentBias
static const uint64_t	kSignMask = RAPIDJSON_UINT64_C2(0x80000000, 0x00000000)
static const uint64_t	kExponentMask = RAPIDJSON_UINT64_C2(0x7FF00000, 0x00000000)
static const uint64_t	kSignificandMask = RAPIDJSON_UINT64_C2(0x000FFFFF, 0xFFFFFFFF)
static const uint64_t	kHiddenBit = RAPIDJSON_UINT64_C2(0x00100000, 0x00000000)

Detailed Description

Definition at line 23 of file ieee754.h.

Constructor & Destructor Documentation

Double() [1/3]

Double ( )

inline

Definition at line 25 of file ieee754.h.

{}

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Double() [2/3]

Double ( double  d )

inline

Definition at line 26 of file ieee754.h.

: d_(d) {}

Double() [3/3]

Double ( uint64_t  u )

inline

Definition at line 27 of file ieee754.h.

: u_(u) {}

Member Function Documentation

EffectiveSignificandSize()

static int EffectiveSignificandSize ( int  order )

inlinestatic

Definition at line 51 of file ieee754.h.

                                                   {
        if (order >= -1021)
            return 53;
        else if (order <= -1074)
            return 0;
        else
            return order + 1074;
    }

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Exponent()

int Exponent ( ) const

inline

Definition at line 39 of file ieee754.h.

{ return static_cast<int>(((u_ & kExponentMask) >> kSignificandSize) - kExponentBias); }

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IntegerExponent()

int IntegerExponent ( ) const

inline

Definition at line 48 of file ieee754.h.

{ return (IsNormal() ? Exponent() : kDenormalExponent) - kSignificandSize; }

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IntegerSignificand()

uint64_t IntegerSignificand ( ) const

inline

Definition at line 47 of file ieee754.h.

{ return IsNormal() ? Significand() | kHiddenBit : Significand(); }

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IsInf()

bool IsInf ( ) const

inline

Definition at line 42 of file ieee754.h.

{ return (u_ & kExponentMask) == kExponentMask && Significand() == 0; }

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IsNan()

bool IsNan ( ) const

inline

Definition at line 41 of file ieee754.h.

{ return (u_ & kExponentMask) == kExponentMask && Significand() != 0; }

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IsNanOrInf()

bool IsNanOrInf ( ) const

inline

Definition at line 43 of file ieee754.h.

{ return (u_ & kExponentMask) == kExponentMask; }

IsNormal()

bool IsNormal ( ) const

inline

Definition at line 44 of file ieee754.h.

{ return (u_ & kExponentMask) != 0 || Significand() == 0; }

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IsZero()

bool IsZero ( ) const

inline

Definition at line 45 of file ieee754.h.

{ return (u_ & (kExponentMask | kSignificandMask)) == 0; }

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NextPositiveDouble()

double NextPositiveDouble ( ) const

inline

Definition at line 32 of file ieee754.h.

                                      {
        RAPIDJSON_ASSERT(!Sign());
        return Double(u_ + 1).Value();
    }

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Sign()

bool Sign ( ) const

inline

Definition at line 37 of file ieee754.h.

{ return (u_ & kSignMask) != 0; }

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Significand()

uint64_t Significand ( ) const

inline

Definition at line 38 of file ieee754.h.

{ return u_ & kSignificandMask; }

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ToBias()

uint64_t ToBias ( ) const

inline

Definition at line 49 of file ieee754.h.

{ return (u_ & kSignMask) ? ~u_ + 1 : u_ | kSignMask; }

Uint64Value()

uint64_t Uint64Value ( ) const

inline

Definition at line 30 of file ieee754.h.

{ return u_; }

Value()

double Value ( ) const

inline

Definition at line 29 of file ieee754.h.

{ return d_; }

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Member Data Documentation

@8

union { ... }

d_

double d_

Definition at line 70 of file ieee754.h.

kDenormalExponent

const int kDenormalExponent = 1 - kExponentBias

staticprivate

Definition at line 63 of file ieee754.h.

kExponentBias

const int kExponentBias = 0x3FF

staticprivate

Definition at line 62 of file ieee754.h.

kExponentMask

const uint64_t kExponentMask = RAPIDJSON_UINT64_C2(0x7FF00000, 0x00000000)

staticprivate

Definition at line 65 of file ieee754.h.

kHiddenBit

const uint64_t kHiddenBit = RAPIDJSON_UINT64_C2(0x00100000, 0x00000000)

staticprivate

Definition at line 67 of file ieee754.h.

kSignificandMask

const uint64_t kSignificandMask = RAPIDJSON_UINT64_C2(0x000FFFFF, 0xFFFFFFFF)

staticprivate

Definition at line 66 of file ieee754.h.

kSignificandSize

const int kSignificandSize = 52

staticprivate

Definition at line 61 of file ieee754.h.

kSignMask

const uint64_t kSignMask = RAPIDJSON_UINT64_C2(0x80000000, 0x00000000)

staticprivate

Definition at line 64 of file ieee754.h.

u_

uint64_t u_

Definition at line 71 of file ieee754.h.

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

• rapidjson/internal/ieee754.h