MConvertBase.h
Classes
- MConvertBase -- Conversion of Measures Base (full description)
- Global Functions -- Global functions (full description)
Interface
- Public Members
- virtual ~MConvertBase()
- virtual void setModel(const Measure &val) = 0
- virtual void set(const MeasValue &val) = 0
- virtual void set(const Unit &inunit) = 0
- virtual void addMethod(uInt method) = 0
- virtual void addFrameType(uInt tp) = 0
- virtual Int nMethod() const = 0
- virtual uInt getMethod(uInt which) const = 0
- virtual void print(ostream &os) const = 0
Review Status
- Reviewed By:
- UNKNOWN
- Date Reviewed:
- before2004/08/25
- Programs:
- Tests:
Prerequisite
Etymology
Synopsis
MConvertBase can convert a Measure to the same type of Measure in a
different reference frame. The MConvertBase is a templated class, but
has typedefs for the allowed conversions, like MEpoch::Convert.
The basic operation is to create a MConvertBase with either of:
- MEpoch::Convert(MEpoch, MEpoch::Ref), where the
MEpoch is a template for subsequent
conversions, i.e. it will remember the value and
the input reference frame. And the
MeasRef is the output reference class.
- MEpoch::Convert(MEpoch) with a subsequent setOut(MEpoch::Ref)
- MEpoch::Convert(MEpoch::Ref in, MEpoch::Ref out) is a template for
conversions from the input reference to the output reference. The
'template' model used is the default value for the Measure, with
no units.
- MEpoch::Convert(Unit, MEpoch::Ref in, MEpoch::Ref out) is a
template for
conversions from the input reference to the output reference. The
'template' model used is the default value for the Measure, with
the default units as specified.
- MEpoch::Convert() with a setModel(MEpoch) and setOut().
An empty MeasRef indicates no conversion
.
The constructor, and set functions, analyse the 'template' Measure and the
output reference frame, and construct a pointer (in practice a list
of pointers to bypass the necessity of creating too many conversion
functions) to a conversion routine. Functionals will maybe used in
a later version in stead of a vector of function pointers. During the
implementation process, I have, for a variety of reasons, changed the
list of function pointers to a list of numbers, with the Measure having
just a doConvert() function containing an appropiate
switch statement.
Actual conversions are done with the () operator, which produces a new
MEpoch (or other Measure).
Possible arguments are (MVEpoch is used here generic, and indicates the
internal format of a Measure; possibly, to make sure distinction between
values with and without units is possible, even simple Measures will
have their own internal class format, e.g. MVDouble. This will also aid
in the possibility that I am still pursuing to have a fully dynamic
conversion possibility. However, to be able to use pointers to functions
in any reasonable way for all possible input and output types, a
multi-level approach is necessary, with all possible datatypes derived
from some MeasValue.):
- (MEpoch, MEpoch::Ref): will create a new conversion method, and use
it to produce the result of converting the MEpoch to the specified
frame
- (MEpoch): will create a new conversion method from the
MEpoch to the MeasRef belonging to the MConvertBase
- (Quantity): will use the conversion chain deduced from the
MEpoch model in the definition of MConvertBase, and will convert the
Quantity
- (Quantum >) as previous
- (Double): will use the units (if present) as specified in the
MConvertBase object to construct the internal value
to be converted
- (Vector >): as previous
Float versions will be produced if necessary.
The conversion analyser expects that all Measure classes have a set
of routines to do the actual analysing and conversion.
If the standard conversion is not sufficient, additional methods can be
added at the end of the list with the addMethod() member
function, or at the beginning of the list with insertMethod().
The whole list can be cleared with clearMethod().
To ease the specification of the Method, each Measure has a typedef
(e.g. MEpoch_ConvType) specifying the Method type.
Example
See Measure for an example
Motivation
Conversion of Measures will in general be done on a series of values.
Separating the analysis of the calculations necessary for the conversion
from the actual conversion could speed up the process.
To Do
Member Description
Set a new model for the conversion
virtual void set(const MeasValue &val) = 0
Set a new model value only
virtual void set(const Unit &inunit) = 0
Set a new model unit only
virtual void addMethod(uInt method) = 0
Add a method (Note: uInt should be an enum from the appropiate Measure)
virtual void addFrameType(uInt tp) = 0
Add a FrameTypes used (as specified in MeasFrame::FrameTypes)
virtual Int nMethod() const = 0
Get number of methods
virtual uInt getMethod(uInt which) const = 0
Get method
virtual void print(ostream &os) const = 0
Print a conversion engine
Interface
Private Members
- ostream &operator<<( ostream &os, const MConvertBase &mc)
Member Description
ostream &operator<<( ostream &os, const MConvertBase &mc)
Output decalration