casacore::UnitDim Class Reference

describes a unit in basic SI unit dimensions More...

#include <UnitDim.h>

Public Types
enum	Dim {   Dm,   Dkg,   Ds,   DA,   DK,   Dcd,   Dmol,   Drad,   Dsr,   Dnon,   Dnumber }
	Enumeration of the order and number of the defining SI units. More...

Public Member Functions
	~UnitDim ()
	Destructor. More...

Protected Member Functions
void	init ()
void	init (Int pos)

Private Member Functions
	UnitDim ()
	Construct a unit with zero dimension in all SI units. More...
	UnitDim (const UnitDim &other)
	Copy constructor. More...
	UnitDim (Int pos)
	Construct a unit dimension with a one in the indicated position (as Dim enumerator) and zeroes in all other units. More...
UnitDim &	operator= (const UnitDim &other)
	Assignment (copy semantics) More...
UnitDim	pow (Int p)
	Raise all SI defining units to an integer power. More...
UnitDim &	operator*= (const UnitDim &other)
	Operators to combine unit dimensions. More...
UnitDim	operator* (const UnitDim &other) const
UnitDim &	operator/= (const UnitDim &other)
	Division subtracts the unit dimensions of all SI units. More...
UnitDim	operator/ (const UnitDim &other) const
Bool	operator== (const UnitDim &other) const
	Compare dimension of units. More...
Bool	operator!= (const UnitDim &other) const
	Compare for unequal dimensions. More...

Static Private Member Functions
static const String &	dimName (uInt which)
	Get the tag for specified dimension. More...
static const String &	dimFull (uInt which)
	Get the full name for the specified dimension. More...

Private Attributes
Long	unitLong [UNITDIM_DLNUMBER]
	1-byte vector to contain the dimensions of the defining SI units (using same storage as Long vector for speed reasons) More...
Char *	unitDim

Friends
class	UnitVal
class	UnitMap
ostream &	operator<< (ostream &os, const UnitDim &du)
	Output the SI dimensions (e.g. More...

Detailed Description

describes a unit in basic SI unit dimensions

Intended use:

Internal

Review Status

Reviewed By:

UNKNOWN

Date Reviewed:

before2004/08/25

Test programs:

tUnit

Prerequisite

• Unit

Etymology

Based on Unit and the Dimension of a unit in SI defining units

Synopsis

Physical units are strings consisting of one or more names of known basic units, separated by '.' or ' ' (for multiplication) or '/' (for division). Each name can optionally be preceded by a standard decimal prefix, and/or followed by an (optionally signed) exponent. Example: km/s/(Mpc.s)2 is identical to km.s-1.Mpc-2.s-2

See the Unit for more details.

The UnitDim class is a private class for use by the Unit classes. It contains the dimensions in the 9 basic defining SI units of a unit.

Example

Motivation

The UnitDim class has been separated to keep the interface between a complex unit description string and the basic SI units clean.

To Do

• Some inlining (did not work first go)

Definition at line 87 of file UnitDim.h.

Member Enumeration Documentation

enum casacore::UnitDim::Dim

Enumeration of the order and number of the defining SI units.

If order or contents changed, change also in dimName() and dimFull().

Enumerator
Dm
Dkg
Ds
DA
DK
Dcd
Dmol
Drad
Dsr
Dnon
Dnumber

Definition at line 99 of file UnitDim.h.

Constructor & Destructor Documentation

casacore::UnitDim::~UnitDim

(

)

Destructor.

casacore::UnitDim::UnitDim ( )

inlineprivate

Construct a unit with zero dimension in all SI units.

Definition at line 113 of file UnitDim.h.

References init().

casacore::UnitDim::UnitDim ( const UnitDim &  other )

private

Copy constructor.

casacore::UnitDim::UnitDim ( Int  pos )

inlineprivate

Construct a unit dimension with a one in the indicated position (as Dim enumerator) and zeroes in all other units.

Definition at line 120 of file UnitDim.h.

References init().

Member Function Documentation

static const String& casacore::UnitDim::dimFull ( uInt  which )

staticprivate

Get the full name for the specified dimension.

static const String& casacore::UnitDim::dimName ( uInt  which )

staticprivate

Get the tag for specified dimension.

void casacore::UnitDim::init ( )

protected

Referenced by UnitDim().

void casacore::UnitDim::init ( Int  pos )

protected

Bool casacore::UnitDim::operator!= ( const UnitDim &  other ) const

private

Compare for unequal dimensions.

UnitDim casacore::UnitDim::operator* ( const UnitDim &  other ) const

private

UnitDim& casacore::UnitDim::operator*= ( const UnitDim &  other )

private

Operators to combine unit dimensions.

Multiplication adds the unit dimensions of all SI units

UnitDim casacore::UnitDim::operator/ ( const UnitDim &  other ) const

private

UnitDim& casacore::UnitDim::operator/= ( const UnitDim &  other )

private

Division subtracts the unit dimensions of all SI units.

UnitDim& casacore::UnitDim::operator= ( const UnitDim &  other )

private

Assignment (copy semantics)

Bool casacore::UnitDim::operator== ( const UnitDim &  other ) const

private

Compare dimension of units.

Compare for equal dimensions

UnitDim casacore::UnitDim::pow ( Int  p )

private

Raise all SI defining units to an integer power.

Friends And Related Function Documentation

ostream& operator<< ( ostream &  os, const UnitDim &  du  )

friend

Output the SI dimensions (e.g.

'km/s/g' as 'm kg-1 s-1')

friend class UnitMap

friend

Definition at line 91 of file UnitDim.h.

friend class UnitVal

friend

Definition at line 90 of file UnitDim.h.

Member Data Documentation

Char* casacore::UnitDim::unitDim

private

Definition at line 157 of file UnitDim.h.

Long casacore::UnitDim::unitLong[UNITDIM_DLNUMBER]

private

1-byte vector to contain the dimensions of the defining SI units (using same storage as Long vector for speed reasons)

Definition at line 156 of file UnitDim.h.

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

• casa/casacore/casa/Quanta/UnitDim.h