Units Class Reference

A representation of the units associated with a dimensional quantity. More...

#include <Units.h>

Detailed Description

A representation of the units associated with a dimensional quantity.

Used for converting quantities between unit systems and checking for dimensional consistency. Units objects are mainly used within UnitSystem class to convert values from a user-specified Unit system to Cantera's base units (SI + kmol).

Definition at line 34 of file Units.h.

Public Member Functions
	Units (double factor=1.0, double mass=0, double length=0, double time=0, double temperature=0, double current=0, double quantity=0)
	Create a Units object with the specified dimensions. More...
	Units (const string &units, bool force_unity=false)
	Create an object with the specified dimensions. More...
bool	convertible (const Units &other) const
	Returns true if the specified Units are dimensionally consistent. More...
double	factor () const
	Return the factor for converting from this unit to Cantera's base units. More...
Units &	operator*= (const Units &other)
	Multiply two Units objects, combining their conversion factors and dimensions. More...
string	str (bool skip_unity=true) const
	Provide a string representation of these Units. More...
Units	pow (double exponent) const
	Raise these Units to a power, changing both the conversion factor and the dimensions of these Units. More...
bool	operator== (const Units &other) const
double	dimension (const string &primary) const
	Return dimension of primary unit component ("mass", "length", "time", "temperature", "current", or "quantity") More...

Private Member Functions
void	scale (double k)
	Scale the unit by the factor k More...

Private Attributes
double	m_factor = 1.0
	conversion factor to Cantera base units More...
double	m_mass_dim = 0.0
double	m_length_dim = 0.0
double	m_time_dim = 0.0
double	m_temperature_dim = 0.0
double	m_current_dim = 0.0
double	m_quantity_dim = 0.0
double	m_pressure_dim = 0.0
	pseudo-dimension to track explicit pressure units More...
double	m_energy_dim = 0.0
	pseudo-dimension to track explicit energy units More...

Friends
class	UnitSystem

Constructor & Destructor Documentation

Units() [1/2]

Units ( double  factor = 1.0, double  mass = 0, double  length = 0, double  time = 0, double  temperature = 0, double  current = 0, double  quantity = 0  )

explicit

Create a Units object with the specified dimensions.

Definition at line 109 of file Units.cpp.

Units() [2/2]

Units ( const string &  units, bool  force_unity = false  )

explicit

Create an object with the specified dimensions.

Parameters

units	A string representation of the units. See UnitSystem for a description of the formatting options.
force_unity	ensure that conversion factor is equal to one

Definition at line 131 of file Units.cpp.

Member Function Documentation

convertible()

bool convertible

(

const Units &

other

)

const

Returns true if the specified Units are dimensionally consistent.

Definition at line 199 of file Units.cpp.

factor()

double factor ( ) const

inline

Return the factor for converting from this unit to Cantera's base units.

Definition at line 53 of file Units.h.

operator*=()

Units & operator*=

(

const Units &

other

)

Multiply two Units objects, combining their conversion factors and dimensions.

Definition at line 209 of file Units.cpp.

str()

string str

(

bool

skip_unity = true

)

const

Provide a string representation of these Units.

Parameters

skip_unity

do not print '1' if conversion factor is equal to one

Definition at line 234 of file Units.cpp.

pow()

Units pow

(

double

exponent

)

const

Raise these Units to a power, changing both the conversion factor and the dimensions of these Units.

Definition at line 223 of file Units.cpp.

dimension()

double dimension

(

const string &

primary

)

const

Return dimension of primary unit component ("mass", "length", "time", "temperature", "current", or "quantity")

Definition at line 303 of file Units.cpp.

scale()

void scale ( double  k )

inlineprivate

Scale the unit by the factor k

Definition at line 75 of file Units.h.

Member Data Documentation

m_factor

double m_factor = 1.0

private

conversion factor to Cantera base units

Definition at line 77 of file Units.h.

m_pressure_dim

double m_pressure_dim = 0.0

private

pseudo-dimension to track explicit pressure units

Definition at line 84 of file Units.h.

m_energy_dim

double m_energy_dim = 0.0

private

pseudo-dimension to track explicit energy units

Definition at line 85 of file Units.h.

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

• Units.h
• Units.cpp