QC.h
Classes
- QC -- Physical constants (i.e. dimensioned values) (full description)
- QC_init -- Class used to force construction of QC. (full description)
- Global Functions -- Object used to force construction of QC. (full description)
class QC
Interface
- Private Members
- static void init()
- See Also
- QC_init -- Class used to force construction of QC.
- QC initialization object -- Object used to force construction of QC.
Review Status
- Reviewed By:
- UNKNOWN
- Date Reviewed:
- before2004/08/25
- Programs:
- Tests:
Prerequisite
Etymology
A QC is based on the Quantum and C (constants) class
Synopsis
QC:name will produce a Quantity (Quantum<Double>) value consisting of
a value and a unit. See the Quantum class
for possibilities of manipulating quanta.
tQuantum will give a list of the currently available constants
Example
To obtain the velocity of light in pc/a, use:
#include <casa/Quanta.h>
Double vel_pcpy = (C::c).convert("pc/a").getValue();
The following constants are defined as public data members of class QC.
The following public data member documentation is currently extracted by
hand, and thus could be out of date if this documentation was not updated
when the class was modified.
// vel of light
static Quantum<Double> c;
// Gravitational constant
static Quantum<Double> G;
// Planck
static Quantum<Double> h;
// HI line
static Quantum<Double> HI;
// Gas constant
static Quantum<Double> R;
// Avogadro
static Quantum<Double> NA;
// electron charge
static Quantum<Double> e;
// proton mass
static Quantum<Double> mp;
// mp/me
static Quantum<Double> mp_me;
// permeability vacuum
static Quantum<Double> mu0;
// permittivity vacuum
static Quantum<Double> epsilon0;
// Boltzmann
static Quantum<Double> k;
// Faraday
static Quantum<Double> F;
// mass electron
static Quantum<Double> me;
// radius electron
static Quantum<Double> re;
// Bohr's radius
static Quantum<Double> a0;
// Solar radius
static Quantum<Double> R0;
// IAU Gaussian grav. const **2
static Quantum<Double> k2;
Motivation
Physical constants should be known with their proper dimensions
To Do
Member Description
static void init()
This function is used, in conjunction with the
QC_init
class to force construction of statics (see ARM 3.4).
Interface
Public Members
- QC_init()
- ~QC_init()
See Also
- QC initialization object -- Object used to force construction of QC.
Synopsis
A static object of this class is used to make sure that
QC
is constructed before it is needed, and therefore that its static data
members are defined. See Meyers, p. 47.
Member Description
Interface
Synopsis
This static object of the QC_init
class is used to make sure that
QC
is constructed before it is needed, and therefore that its static data
members are defined. See Meyers, p. 47.
Member Description