MVDouble.h

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// # MVDouble.h: class to distinguish between internal and external Double
// # Copyright (C) 1996,1997,1998,1999,2000,2001
// # Associated Universities, Inc. Washington DC, USA.
// #
// # This library is free software; you can redistribute it and/or modify it
// # under the terms of the GNU Library General Public License as published by
// # the Free Software Foundation; either version 2 of the License, or (at your
// # option) any later version.
// #
// # This library is distributed in the hope that it will be useful, but WITHOUT
// # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// # FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
// # License for more details.
// #
// # You should have received a copy of the GNU Library General Public License
// # along with this library; if not, write to the Free Software Foundation,
// # Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
// #
// # Correspondence concerning AIPS++ should be addressed as follows:
// #        Internet email: casa-feedback@nrao.edu.
// #        Postal address: AIPS++ Project Office
// #                        National Radio Astronomy Observatory
// #                        520 Edgemont Road
// #                        Charlottesville, VA 22903-2475 USA
 
#ifndef CASA_MVDOUBLE_H
#define CASA_MVDOUBLE_H
 
// # Includes
#include <casacore/casa/aips.h>
#include <casacore/casa/Arrays/Vector.h>
#include <casacore/casa/Quanta/Quantum.h>
#include <casacore/casa/Quanta/MeasValue.h>
#include <casacore/casa/iosfwd.h>
 
namespace casacore {  // # NAMESPACE CASACORE - BEGIN
 
// # Forward Declarations
 
// # Constants (SUN compiler does not accept non-simple default arguments)
 
// <summary> Class to distinguish external and Measure internal Double </summary>
 
// <use visibility=export>
 
// <reviewed reviewer="tcornwel" date="1996/02/23" tests="tMeasMath" demos="">
// </reviewed>
 
// <prerequisite>
// <li> <linkto class=MeasValue>MeasValue</linkto>
// </prerequisite>
//
// <etymology>
// From Measure, Value and Double
// </etymology>
//
// <synopsis>
// An MVDouble is a simple Double, to be used in simple, single value
// Measures. Requirements can be found in the
// <linkto class=MeasValue>MeasValue</linkto> base class.<br>
// The only reasonable constructor is (but all MeasValue constructors are present)
// <src>MVDouble(Double)</src>; and an <src>operator Double</src> takes
// care of all other possibilities. Its external use is for
//  <linkto class=MeasConvert>MeasConvert</linkto>, to distinguish between
// input in internal Measure units, and values which have to have
// units applied.
// </synopsis>
//
// <example>
// See e.g. <linkto class=MFrequency>MFrequency</linkto>
// </example>
//
// <motivation>
// To aid coordinate transformations possibilities
// </motivation>
//
// <todo asof="1995/09/04">
// </todo>
 
class MVDouble : public MeasValue {
 public:
  // # Constructors
  //  Default constructor: generate a zero value
  MVDouble();
  // Copy constructor
  MVDouble(const MVDouble &other);
  // Copy assignment
  MVDouble &operator=(const MVDouble &other);
  // Constructor from Double
  MVDouble(Double d);
  // Constructor from Quantum : value taken will be the canonical value
  // <group>
  MVDouble(const Quantity &other);
  MVDouble(const Quantum<Vector<Double>> &other);
  // </group>
  // Constructor from Vector. A zero value will be taken for an empty vector,
  // the canonical value for a quantum vector.
  // <thrown>
  //  <li> AipsError if vector length > 1
  // </thrown>
  // <group>
  MVDouble(const Vector<Double> &other);
  MVDouble(const Vector<Quantity> &other);
  // </group>
 
  // Destructor
  ~MVDouble();
 
  // # Operators
  //  Conversion operator
  operator Double() const;
 
  // Addition
  // <group>
  MVDouble &operator+=(const MVDouble &other);
  MVDouble &operator-=(const MVDouble &other);
  // </group>
  // Comparisons
  // <group>
  Bool operator==(const MVDouble &other) const;
  Bool operator!=(const MVDouble &other) const;
  Bool near(const MVDouble &other, Double tol = 1e-13) const;
  Bool nearAbs(const MVDouble &other, Double tol = 1e-13) const;
  // </group>
 
  // # General member functions
  //  Tell me your type
  //  <group>
  static void assure(const MeasValue &in);
  // </group>
  // Print data
  virtual void print(ostream &os) const;
  // Clone
  virtual MeasValue *clone() const;
  // Adjust value: taken from base class, a NOP.
  // Get the value in internal units
  virtual Vector<Double> getVector() const;
  // Set the value from internal units (set 0 for empty vector)
  virtual void putVector(const Vector<Double> &in);
  // Get the internal value as a <src>Vector<Quantity></src>. Usable in
  // records. The getXRecordValue() gets additional information for records.
  // Note that the Vectors could be empty.
  // <group>
  virtual Vector<Quantum<Double>> getRecordValue() const;
  // </group>
  // Set the internal value if correct values and dimensions
  virtual Bool putValue(const Vector<Quantum<Double>> &in);
 
 private:
  // # Data
  //  Value
  Double val;
};
 
}  // namespace casacore
 
#endif