Engine::Decimal Class Reference

Encapsulates float type. More...

#include <B2BITS_Decimal.h>

Public Member Functions
Decimal	changeExponent (System::i32 newExponent) const throw ()
	Returns new Decimal value with required exponent. More...
	Decimal () throw ()
	Default contructor. More...
	Decimal (System::i64 m, System::i32 e) throw ()
	Contructor Constructs object from mantissa and exponent. More...
	Decimal (double v) throw ()
	Contructor Constructs object from double. More...
	Decimal (System::i64 x) throw ()
	Contructor Constructs object from 64-bit integer. More...
bool	equals (const Decimal &rv) const throw ()
	Compares two Decimals. More...
System::i32	getExponent () const throw ()
	Returns exponent part of the value. More...
System::i64	getMantissa () const throw ()
	Returns mantissa part of the value. More...
bool	operator!= (Engine::Decimal const &val) const throw ()
	Compares two decimals. More...
bool	operator< (Engine::Decimal const &val) const throw ()
	Compares two decimals. More...
bool	operator<= (Engine::Decimal const &val) const throw ()
	Compares two decimals. More...
bool	operator== (Engine::Decimal const &val) const throw ()
	Compares two decimals. More...
bool	operator> (Engine::Decimal const &val) const throw ()
	Compares two decimals. More...
bool	operator>= (Engine::Decimal const &val) const throw ()
	Compares two decimals. More...
double	toDouble () const throw ()
	Converts stored value to double. More...
float	toFloat () const throw ()
	Converts stored value to float. More...
std::string	toStdString () const
	Converts decimal to FIX string. More...
char *	toString (char *buf) const throw ()
	Converts decimal to FIX string. More...
char *	toString (char *buf, std::size_t size) const throw ()
	If result string is less than passed buffer, remain chars will be filled with zeros according to FIX protocol. More...

Static Public Member Functions
static Decimal	fromDouble (double v, int precision) throw ()
	Contructor Constructs object from double. More...
static Decimal	fromDouble (double v) throw ()
	Contructor Constructs object from double. More...
static Decimal	fromFixString (AsciiString str) throw ()
	Converts string to Decimal. More...
static Decimal	fromString (AsciiString str) throw ()
	Converts string to Decimal. More...
static Decimal	fromString (WideString str) throw ()
	Converts wide-string to Decimal. More...

Static Public Attributes
static unsigned int const	ValueSize = 2 + 63 + sizeof( "18446744073709551616" )
	Maximum buffer size required to store value. More...

Detailed Description

Encapsulates float type.

Constructor & Destructor Documentation

Engine::Decimal::Decimal	(		)
throw	(
	)

Default contructor.

Engine::Decimal::Decimal	(	System::i64	m,
		System::i32	e
	)
throw	(
	)

Contructor Constructs object from mantissa and exponent.

Parameters

m	Mantissa
e	Exponent

Engine::Decimal::Decimal	(	double	v	)
throw	(
	)

Contructor Constructs object from double.

Parameters

v	Value of the double type

Engine::Decimal::Decimal	(	System::i64	x	)
throw	(
	)

Contructor Constructs object from 64-bit integer.

Parameters

x	Value of the i64 type

Member Function Documentation

Decimal Engine::Decimal::changeExponent	(	System::i32	newExponent	)	const
throw	(
	)

Returns new Decimal value with required exponent.

bool Engine::Decimal::equals	(	const Decimal &	rv	)	const
throw	(
	)

Compares two Decimals.

Parameters

rv	Value to compare with.

Returns

true if equals; false otherwise

static Decimal Engine::Decimal::fromDouble ( double  v, int  precision  ) throw ( )

static

Contructor Constructs object from double.

Warning

This method is lossy.

Parameters

v	Value of the double type
precision	Number of digits after point.

static Decimal Engine::Decimal::fromDouble ( double  v ) throw ( )

static

Contructor Constructs object from double.

Warning

This method is lossy.

Parameters

v	Value of the double type

static Decimal Engine::Decimal::fromFixString ( AsciiString  str ) throw ( )

inlinestatic

Converts string to Decimal.

Referenced by fixToBin_Decimal32NULL(), fixToBin_Decimal64NULL(), fixToBin_PRICE9(), and fixToBin_PRICENULL9().

static Decimal Engine::Decimal::fromString ( AsciiString  str ) throw ( )

static

Converts string to Decimal.

static Decimal Engine::Decimal::fromString ( WideString  str ) throw ( )

static

Converts wide-string to Decimal.

System::i32 Engine::Decimal::getExponent ( ) const throw ( )

inline

Returns exponent part of the value.

Returns

exponent part of the value

Referenced by fixToBin_Decimal32NULL(), and fixToBin_Decimal64NULL().

System::i64 Engine::Decimal::getMantissa ( ) const throw ( )

inline

Returns mantissa part of the value.

Returns

mantissa part of the value

Referenced by fixToBin_Decimal32NULL(), fixToBin_Decimal64NULL(), fixToBin_PRICE9(), and fixToBin_PRICENULL9().

bool Engine::Decimal::operator!=	(	Engine::Decimal const &	val	)	const
throw	(
	)

Compares two decimals.

Returns

true if two decimals are NOT equal; false otherwise.

bool Engine::Decimal::operator<	(	Engine::Decimal const &	val	)	const
throw	(
	)

Compares two decimals.

Returns

true if left decimal is smaller than right; false otherwise.

bool Engine::Decimal::operator<=	(	Engine::Decimal const &	val	)	const
throw	(
	)

Compares two decimals.

Returns

true if left decimal is smaller or equal than right; false otherwise.

Note

Please note this method works only if both decimal have same exponent

bool Engine::Decimal::operator==	(	Engine::Decimal const &	val	)	const
throw	(
	)

Compares two decimals.

Returns

true if two decimals are equal; false otherwise.

bool Engine::Decimal::operator>	(	Engine::Decimal const &	val	)	const
throw	(
	)

Compares two decimals.

Returns

true if left decimal is larger than right; false otherwise.

bool Engine::Decimal::operator>=	(	Engine::Decimal const &	val	)	const
throw	(
	)

Compares two decimals.

Returns

true if left decimal is larger or equal than right; false otherwise.

double Engine::Decimal::toDouble	(		)	const
throw	(
	)

Converts stored value to double.

Returns

double representation of the value

float Engine::Decimal::toFloat	(		)	const
throw	(
	)

Converts stored value to float.

Returns

float representation of the value

std::string Engine::Decimal::toStdString

(

)

const

Converts decimal to FIX string.

Converts decimal to FIX string

Returns

FIX representation of the Decimal value

char* Engine::Decimal::toString	(	char *	buf	)	const
throw	(
	)

Converts decimal to FIX string.

Parameters

[out]

buf

Buffer to convert to. Should be enough to store Engine::Decimal::ValueSize bytes.

Returns

Pointer to the first character of the value

char* Engine::Decimal::toString	(	char *	buf,
		std::size_t	size
	)		const
throw	(
	)

If result string is less than passed buffer, remain chars will be filled with zeros according to FIX protocol.

Parameters

[out]	buf	Buffer to convert to.
[in]	size	Size of the buffer.

Member Data Documentation

unsigned int const Engine::Decimal::ValueSize = 2 + 63 + sizeof( "18446744073709551616" )

static

Maximum buffer size required to store value.