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TRealX Class Reference

class TRealX

A class encapsulating an extended precision real value.

This class provides 64 bit precision and a dynamic range of approximately 1E-9863 to 1E+9863. All member functions are optimized for speed.

Public Member Functions
	TRealX ()
	TRealX ( TInt )
	TRealX ( TUint )
	TRealX ( TUint , TUint , TUint )
	TRealX (const TInt64 &)
	TRealX ( TReal32 )
	TRealX ( TReal64 )
IMPORT_C TInt	Add ( TRealX &, const TRealX &)
IMPORT_C TInt	AddEq (const TRealX &)
IMPORT_C TRealXOrder	Compare (const TRealX &)
IMPORT_C TInt	Div ( TRealX &, const TRealX &)
IMPORT_C TInt	DivEq (const TRealX &)
IMPORT_C TInt	GetTReal ( TReal32 &)
IMPORT_C TInt	GetTReal ( TReal64 &)
IMPORT_C TBool	IsFinite ()
IMPORT_C TBool	IsInfinite ()
IMPORT_C TBool	IsNaN ()
IMPORT_C TBool	IsZero ()
IMPORT_C TInt	Mod ( TRealX &, const TRealX &)
IMPORT_C TInt	ModEq (const TRealX &)
IMPORT_C TInt	Mult ( TRealX &, const TRealX &)
IMPORT_C TInt	MultEq (const TRealX &)
IMPORT_C TInt	Set ( TInt )
IMPORT_C TInt	Set ( TUint )
IMPORT_C TInt	Set (const TInt64 &)
IMPORT_C TInt	Set ( TReal32 )
IMPORT_C TInt	Set ( TReal64 )
IMPORT_C void	SetInfinite ( TBool )
IMPORT_C void	SetNaN ()
IMPORT_C void	SetZero ( TBool )
IMPORT_C TInt	Sub ( TRealX &, const TRealX &)
IMPORT_C TInt	SubEq (const TRealX &)
IMPORT_C	operator TInt ()
IMPORT_C	operator TInt64 ()
IMPORT_C	operator TReal32 ()
IMPORT_C	operator TReal64 ()
IMPORT_C	operator TUint ()
TBool	operator!= (const TRealX &)
IMPORT_C TRealX	operator% (const TRealX &)
IMPORT_C const TRealX &	operator%= (const TRealX &)
IMPORT_C TRealX	operator* (const TRealX &)
IMPORT_C const TRealX &	operator*= (const TRealX &)
IMPORT_C TRealX	operator+ ()
IMPORT_C TRealX	operator+ (const TRealX &)
IMPORT_C TRealX &	operator++ ()
IMPORT_C TRealX	operator++ ( TInt )
IMPORT_C const TRealX &	operator+= (const TRealX &)
IMPORT_C TRealX	operator- ()
IMPORT_C TRealX	operator- (const TRealX &)
IMPORT_C TRealX &	operator-- ()
IMPORT_C TRealX	operator-- ( TInt )
IMPORT_C const TRealX &	operator-= (const TRealX &)
IMPORT_C TRealX	operator/ (const TRealX &)
IMPORT_C const TRealX &	operator/= (const TRealX &)
TBool	operator< (const TRealX &)
TBool	operator<= (const TRealX &)
IMPORT_C TRealX &	operator= ( TInt )
IMPORT_C TRealX &	operator= ( TUint )
IMPORT_C TRealX &	operator= (const TInt64 &)
IMPORT_C TRealX &	operator= ( TReal32 )
IMPORT_C TRealX &	operator= ( TReal64 )
TBool	operator== (const TRealX &)
TBool	operator> (const TRealX &)
TBool	operator>= (const TRealX &)

Public Member Enumerations
enum	TRealXOrder { ELessThan = 1, EEqual = 2, EGreaterThan = 4, EUnordered = 8 }

Public Attributes
TUint16	iExp
TUint8	iFlag
TUint32	iMantHi
TUint32	iMantLo
TInt8	iSign

Constructor & Destructor Documentation

TRealX()

IMPORT_C

TRealX

(

)

Constructs a default extended precision object.

This sets the value to zero.

TRealX(TInt)

IMPORT_C

TRealX

(

TInt

aInt

)

Constructs an extended precision object from a signed integer value.

Parameters

TInt aInt

TRealX(TUint)

IMPORT_C

TRealX

(

TUint

aInt

)

Constructs an extended precision object from an unsigned integer value.

Parameters

TUint aInt

TRealX(TUint, TUint, TUint)

IMPORT_C	TRealX	(	TUint	aExp,
			TUint	aMantHi,
			TUint	aMantLo
		)

Constructs an extended precision object from an explicit exponent and a 64 bit mantissa.

Parameters

TUint aExp
TUint aMantHi	The high order 32 bits of the 64 bit mantissa
TUint aMantLo	The low order 32 bits of the 64 bit mantissa

TRealX(const TInt64 &)

IMPORT_C

TRealX

(

const TInt64 &

aInt

)

Constructs an extended precision object from a 64 bit integer.

Parameters

const TInt64 & aInt

TRealX(TReal32)

IMPORT_C

TRealX

(

TReal32

aReal

)

Constructs an extended precision object from a single precision floating point number.

Parameters

TReal32 aReal

The single precision floating point value.

TRealX(TReal64)

IMPORT_C

TRealX

(

TReal64

aReal

)

Constructs an extended precision object from a double precision floating point number.

Parameters

TReal64 aReal

The double precision floating point value.

Member Functions Documentation

Add(TRealX &, const TRealX &)

IMPORT_C TInt	Add	(	TRealX &	aResult,
			const TRealX &	aVal
		)	const

Adds an extended precision value to this extended precision number.

Parameters

TRealX & aResult	On return, a reference to an extended precision object containing the result of the operation.
const TRealX & aVal	The extended precision value to be added.

AddEq(const TRealX &)

IMPORT_C TInt

AddEq

(

const TRealX &

aVal

)

Adds an extended precision value to this extended precision number.

Parameters

const TRealX & aVal

The extended precision value to be added.

Compare(const TRealX &)

IMPORT_C TRealXOrder

Compare

(

const TRealX &

aVal

)

const

Parameters

const TRealX & aVal

Div(TRealX &, const TRealX &)

IMPORT_C TInt	Div	(	TRealX &	aResult,
			const TRealX &	aVal
		)	const

Divides this extended precision number by an extended precision value.

Parameters

TRealX & aResult	On return, a reference to an extended precision object containing the result of the operation.
const TRealX & aVal	The extended precision value to be used as the divisor.

DivEq(const TRealX &)

IMPORT_C TInt

DivEq

(

const TRealX &

aVal

)

Divides this extended precision number by an extended precision value.

Parameters

const TRealX & aVal

The extended precision value to be used as the divisor.

GetTReal(TReal32 &)

IMPORT_C TInt

GetTReal

(

TReal32 &

aVal

)

const

Extracts the extended precision value as a single precision floating point value.

Parameters

TReal32 & aVal

A reference to a single precision object which contains the result of the operation.

GetTReal(TReal64 &)

IMPORT_C TInt

GetTReal

(

TReal64 &

aVal

)

const

Extracts the extended precision value as a double precision floating point value.

Parameters

TReal64 & aVal

A reference to a double precision object which contains the result of the operation.

IsFinite()

IMPORT_C TBool

IsFinite

(

)

const

Determines whether the extended precision value has a finite value.

IsInfinite()

IMPORT_C TBool

IsInfinite

(

)

const

Determines whether the extended precision value has a finite value.

IsNaN()

IMPORT_C TBool

IsNaN

(

)

const

Determines whether the extended precision value is 'not a number'.

IsZero()

IMPORT_C TBool

IsZero

(

)

const

Determines whether the extended precision value is zero.

Mod(TRealX &, const TRealX &)

IMPORT_C TInt	Mod	(	TRealX &	aResult,
			const TRealX &	aVal
		)	const

Modulo-divides this extended precision number by an extended precision value.

Parameters

TRealX & aResult	On return, a reference to an extended precision object containing the result of the operation.
const TRealX & aVal	The extended precision value to be used as the divisor.

ModEq(const TRealX &)

IMPORT_C TInt

ModEq

(

const TRealX &

aVal

)

Modulo-divides this extended precision number by an extended precision value.

Parameters

const TRealX & aVal

The extended precision value to be used as the divisor.

Mult(TRealX &, const TRealX &)

IMPORT_C TInt	Mult	(	TRealX &	aResult,
			const TRealX &	aVal
		)	const

Multiplies this extended precision number by an extended precision value.

Parameters

TRealX & aResult	On return, a reference to an extended precision object containing the result of the operation.
const TRealX & aVal	The extended precision value to be used as the multiplier.

MultEq(const TRealX &)

IMPORT_C TInt

MultEq

(

const TRealX &

aVal

)

Multiplies this extended precision number by an extended precision value.

Parameters

const TRealX & aVal

The extended precision value to be used as the multiplier.

Set(TInt)

IMPORT_C TInt

Set

(

TInt

aInt

)

Gives this extended precision object a new value taken from a signed integer.

Parameters

TInt aInt

Set(TUint)

IMPORT_C TInt

Set

(

TUint

aInt

)

Gives this extended precision object a new value taken from an unsigned integer.

Parameters

TUint aInt

Set(const TInt64 &)

IMPORT_C TInt

Set

(

const TInt64 &

aInt

)

Gives this extended precision object a new value taken from a 64 bit integer.

Parameters

const TInt64 & aInt

Set(TReal32)

IMPORT_C TInt

Set

(

TReal32

aReal

)

Gives this extended precision object a new value taken from a single precision floating point number.

Parameters

TReal32 aReal

The single precision floating point value.

Set(TReal64)

IMPORT_C TInt

Set

(

TReal64

aReal

)

Gives this extended precision object a new value taken from a double precision floating point number.

Parameters

TReal64 aReal

The double precision floating point value.

SetInfinite(TBool)

IMPORT_C void

SetInfinite

(

TBool

aNegative

)

Sets the value of this extended precision object to infinity.

Parameters

TBool aNegative

ETrue, the value is a negative zero; EFalse, the value is a positive zero.

SetNaN()

IMPORT_C void

SetNaN

(

)

Sets the value of this extended precision object to 'not a number'.

SetZero(TBool)

IMPORT_C void

SetZero

(

TBool

aNegative = EFalse

)

Sets the value of this extended precision object to zero.

Parameters

TBool aNegative = EFalse

ETrue, the value is a negative zero; EFalse, the value is a positive zero, this is the default.

Sub(TRealX &, const TRealX &)

IMPORT_C TInt	Sub	(	TRealX &	aResult,
			const TRealX &	aVal
		)	const

Subtracts an extended precision value from this extended precision number.

Parameters

TRealX & aResult	On return, a reference to an extended precision object containing the result of the operation.
const TRealX & aVal	The extended precision value to be subtracted.

SubEq(const TRealX &)

IMPORT_C TInt

SubEq

(

const TRealX &

aVal

)

Subtracts an extended precision value from this extended precision number.

Parameters

const TRealX & aVal

The extended precision value to be subtracted.

operator TInt()

IMPORT_C

operator TInt

(

)

const

Gets the extended precision value as a signed integer value.

The operator returns:

1. zero , if the extended precision value is not a number

2. 0x7FFFFFFF, if the value is positive and too big to fit into a TInt.

3. 0x80000000, if the value is negative and too big to fit into a TInt.

operator TInt64()

IMPORT_C

operator TInt64

(

)

const

Returns the extended precision value as a 64 bit integer value.

The operator returns:

1. zero, if the extended precision value is not a number

2. 0x7FFFFFFF FFFFFFFF, if the value is positive and too big to fit into a TInt64

3. 0x80000000 00000000, if the value is negative and too big to fit into a TInt.

operator TReal32()

IMPORT_C

operator TReal32

(

)

const

Returns the extended precision value as a single precision floating point value.

operator TReal64()

IMPORT_C

operator TReal64

(

)

const

Returns the extended precision value as a double precision floating point value.

operator TUint()

IMPORT_C

operator TUint

(

)

const

Returns the extended precision value as an unsigned signed integer value.

The operator returns:

1. zero, if the extended precision value is not a number

2. 0xFFFFFFFF, if the value is positive and too big to fit into a TUint.

3. zero, if the value is negative and too big to fit into a TUint.

operator!=(const TRealX &)

TBool

operator!=

(

const TRealX &

aVal

)

const [inline]

Compares this extended precision number for in-equality with another.

Parameters

const TRealX & aVal

A reference to the extended precision value to be compared.

operator%(const TRealX &)

IMPORT_C TRealX

operator%

(

const TRealX &

aVal

)

const

Modulo-divides this extended precision number by an extended precision value.

panic: MATHX KErrTotalLossOfPrecision if precision is lost.

panic: MATHX KErrUnderflow if the operation results in underflow.

Parameters

const TRealX & aVal

The extended precision value to be used as the divisor.

operator%=(const TRealX &)

IMPORT_C const TRealX &

operator%=

(

const TRealX &

aVal

)

Modulo-divides this extended precision number by an extended precision value.

panic: MATHX KErrTotalLossOfPrecision panic if precision is lost.

panic: MATHX KErrUnderflow if the operation results in underflow.

Parameters

const TRealX & aVal

The extended precision value to be used as the divisor.

operator*(const TRealX &)

IMPORT_C TRealX

operator*

(

const TRealX &

aVal

)

const

Multiplies this extended precision number by an extended precision value.

panic: MATHX KErrOverflow if the operation results in overflow.

panic: MATHX KErrUnderflow if the operation results in underflow.

Parameters

const TRealX & aVal

The extended precision value to be used as the multiplier.

operator*=(const TRealX &)

IMPORT_C const TRealX &

operator*=

(

const TRealX &

aVal

)

Multiplies this extended precision number by an extended precision value.

panic: MATHX KErrOverflow if the operation results in overflow.

panic: MATHX KErrUnderflow if the operation results in underflow.

Parameters

const TRealX & aVal

The extended precision value to be subtracted.

operator+()

IMPORT_C TRealX

operator+

(

)

const

Returns this extended precision number unchanged.

Note that this may also be referred to as a unary plus operator.

operator+(const TRealX &)

IMPORT_C TRealX

operator+

(

const TRealX &

aVal

)

const

Adds an extended precision value to this extended precision number.

panic: MATHX KErrOverflow if the operation results in overflow.

panic: MATHX KErrUnderflow if the operation results in underflow.

Parameters

const TRealX & aVal

The extended precision value to be added.

operator++()

IMPORT_C TRealX &

operator++

(

)

Increments this extended precision number by one, and then returns a reference to it.

This is also referred to as a prefix operator.

panic: MATHX KErrOverflow if the operation results in overflow.

panic: MATHX KErrUnderflow if the operation results in underflow.

operator++(TInt)

IMPORT_C TRealX

operator++

(

TInt

)

Returns this extended precision number before incrementing it by one.

This is also referred to as a postfix operator.

panic: MATHX KErrOverflow if the operation results in overflow.

panic: MATHX KErrUnderflow if the operation results in underflow.

Parameters

TInt

operator+=(const TRealX &)

IMPORT_C const TRealX &

operator+=

(

const TRealX &

aVal

)

Adds an extended precision value to this extended precision number.

panic: MATHX KErrOverflow if the operation results in overflow.

panic: MATHX KErrUnderflow if the operation results in underflow.

Parameters

const TRealX & aVal

The extended precision value to be added.

operator-()

IMPORT_C TRealX

operator-

(

)

const

Negates this extended precision number.

This may also be referred to as a unary minus operator.

operator-(const TRealX &)

IMPORT_C TRealX

operator-

(

const TRealX &

aVal

)

const

Subtracts an extended precision value from this extended precision number.

panic: MATHX KErrOverflow if the operation results in overflow.

panic: MATHX KErrUnderflow if the operation results in underflow.

Parameters

const TRealX & aVal

The extended precision value to be subtracted.

operator--()

IMPORT_C TRealX &

operator--

(

)

Decrements this extended precision number by one, and then returns a reference to it.

This is also referred to as a prefix operator.

panic: MATHX KErrOverflow if the operation results in overflow.

panic: MATHX KErrUnderflow if the operation results in underflow.

operator--(TInt)

IMPORT_C TRealX

operator--

(

TInt

)

Returns this extended precision number before decrementing it by one.

This is also referred to as a postfix operator.

panic: MATHX KErrOverflow if the operation results in overflow.

panic: MATHX KErrUnderflow if the operation results in underflow.

Parameters

TInt

operator-=(const TRealX &)

IMPORT_C const TRealX &

operator-=

(

const TRealX &

aVal

)

Subtracts an extended precision value from this extended precision number.

panic: MATHX KErrOverflow if the operation results in overflow.

panic: MATHX KErrUnderflow if the operation results in underflow.

Parameters

const TRealX & aVal

The extended precision value to be subtracted.

operator/(const TRealX &)

IMPORT_C TRealX

operator/

(

const TRealX &

aVal

)

const

Divides this extended precision number by an extended precision value.

panic: MATHX KErrOverflow if the operation results in overflow.

panic: MATHX KErrUnderflow if the operation results in underflow.

panic: MATHX KErrDivideByZero if the divisor is zero.

Parameters

const TRealX & aVal

The extended precision value to be used as the divisor.

operator/=(const TRealX &)

IMPORT_C const TRealX &

operator/=

(

const TRealX &

aVal

)

Divides this extended precision number by an extended precision value.

panic: MATHX KErrOverflow if the operation results in overflow.

panic: MATHX KErrUnderflow if the operation results in underflow.

panic: MATHX KErrDivideByZero if the divisor is zero.

Parameters

const TRealX & aVal

The extended precision value to be used as the divisor.

operator<(const TRealX &)

TBool

operator<

(

const TRealX &

aVal

)

const [inline]

Compares this extended precision number for being less than another.

Parameters

const TRealX & aVal

A reference to the extended precision value to be compared.

operator<=(const TRealX &)

TBool

operator<=

(

const TRealX &

aVal

)

const [inline]

Compares this extended precision number for being less than or equal to another.

Parameters

const TRealX & aVal

A reference to the extended precision value to be compared.

operator=(TInt)

IMPORT_C TRealX &

operator=

(

TInt

aInt

)

Assigns the specified signed integer value to this extended precision object.

Parameters

TInt aInt

operator=(TUint)

IMPORT_C TRealX &

operator=

(

TUint

aInt

)

Assigns the specified unsigned integer value to this extended precision object.

Parameters

TUint aInt

operator=(const TInt64 &)

IMPORT_C TRealX &

operator=

(

const TInt64 &

aInt

)

Assigns the specified 64 bit integer value to this extended precision object.

Parameters

const TInt64 & aInt

operator=(TReal32)

IMPORT_C TRealX &

operator=

(

TReal32

aReal

)

Assigns the specified single precision floating point number to this extended precision object.

Parameters

TReal32 aReal

The single precision floating point value.

operator=(TReal64)

IMPORT_C TRealX &

operator=

(

TReal64

aReal

)

Assigns the specified double precision floating point number to this extended precision object.

Parameters

TReal64 aReal

The double precision floating point value.

operator==(const TRealX &)

TBool

operator==

(

const TRealX &

aVal

)

const [inline]

Compares this extended precision number for equality with another.

Parameters

const TRealX & aVal

A reference to the extended precision value to be compared.

operator>(const TRealX &)

TBool

operator>

(

const TRealX &

aVal

)

const [inline]

Compares this extended precision number for being greater than another.

Parameters

const TRealX & aVal

A reference to the extended precision value to be compared.

operator>=(const TRealX &)

TBool

operator>=

(

const TRealX &

aVal

)

const [inline]

Compares this extended precision number for being greater than or equal to another.

Parameters

const TRealX & aVal

A reference to the extended precision value to be compared.

Member Enumerations Documentation

Enum TRealXOrder

Enumerators

ELessThan = 1
EEqual = 2
EGreaterThan = 4
EUnordered = 8

Member Data Documentation

TUint16 iExp

TUint16

iExp

Exponent: biased by 32767, iExp=0 => zero, +65535 => infinity or NaN

TUint8 iFlag

TUint8

iFlag

Flags: 0 for exact, 1 for rounded down, 2 for rounded up

TUint32 iMantHi

TUint32

iMantHi

TUint32 iMantLo

TUint32

iMantLo

The mantissa.

TInt8 iSign

TInt8

iSign

The sign: 0 for +, 1 for -