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ArrayLattice.h
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//# ArrayLattice: Object which converts an Array to a Lattice.
//# Copyright (C) 1994,1995,1996,1997,1998,1999,2000,2003
//# 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 LATTICES_ARRAYLATTICE_H
#define LATTICES_ARRAYLATTICE_H
//# Includes
#include <casacore/casa/aips.h>
#include <casacore/lattices/Lattices/Lattice.h>
#include <casacore/casa/Arrays/Array.h>
namespace casacore { //# NAMESPACE CASACORE - BEGIN
// <summary>
// A memory resident Lattice
// </summary>
// <use visibility=export>
// <reviewed reviewer="Peter Barnes" date="1999/10/30" tests="tArrayLattice" demos="">
// </reviewed>
// <prerequisite>
// <li> <linkto class=Lattice>Lattice</linkto>
// <li> <linkto class=Array>Array</linkto>
// </prerequisite>
// <etymology>
// The ArrayLattice name reflects its role as a Lattice interface to an Array
// object.
// </etymology>
// <synopsis>
// An ArrayLattice is a concrete Lattice class where the data is stored in
// memory as opposed to the <linkto class=PagedArray>PagedArray</linkto> class
// where the data is stored on disk. As a result this class is much more
// suitable to problems which require small Lattices that can fit into the
// memory of a computer.
//
// ArrayLattice imposes another layer of function calls on top of a an
// Array. As a result they should not be used for generic Array
// manipulation. They are useful if you have an Array that needs to use
// Lattice functions or needs to be used with PagedArrays or other Lattice
// derivatives (like <linkto class=LatticeExpr>LatticeExpr</linkto> or
// <linkto class=SubLattice>SubLattice</linkto>).
// For example the LatticeIterator class can iterate through an Array in
// more ways than any of the ArrayIterator classes can. The examples below
// illustrate some uses for ArrayLattices.
// </synopsis>
// <example>
// All the examples in this section are available in
// <src>dArrayLattice.cc</src>
//
// <h4>Example 1:</h4>
// In this example an Array of data is converted into an ArrayLattice so that
// the copyData function can be used to write the data to a PagedArray which
// will be stored on disk.
// <srcblock>
// // make an Array and fill it with data.
// Array<Float> myArray(IPosition(3, 64, 64, 2));
// indgen(myArray); // fills the Array with 0,1,2,....,64*64*2-1
// // construct the ArrayLattice
// ArrayLattice<Float> myLattice(myArray);
// // make a PagedArray to store the data on disk
// PagedArray<Float> myPagedArray(myLattice.shape(), "myTestData.array");
// // now copy the data onto disk
// myPagedArray.copyData (myLattice);
// </srcblock>
// Note that it could be done in a somewhat simpler way as:
// <srcblock>
// // make an Array and fill it with data.
// Array<Float> myArray(IPosition(3, 64, 64, 2));
// indgen(myArray); // fills the Array with 0,1,2,....,64*64*2-1
// // make a PagedArray to store the data on disk
// PagedArray<Float> myPagedArray(myLattice.shape(), "myTestData.array");
// // now put the data onto disk
// myPagedArray.put (myArray);
// </srcblock>
//
// <h4>Example 2:</h4>
// The <linkto class=ArrayIterator>ArrayIterator</linkto> class (or its
// derivatives the <linkto class=VectorIterator>VectorIterator</linkto> and the
// <linkto class=MatrixIterator>MatrixIterator</linkto> classes) do not allow
// the user to specify a cursor shape. In this example a Cube class will be
// converted into an ArrayLattice so that an ArrLatticeIter can be used to
// access the data spectrum by spectrum (assuming the z-axis is frequency).
//
// <srcblock>
// Cube<Float> arr(64,64,128);
// // assume that the data gets put into the cube somehow
// // now construct an ArrayLattice from this cube.
// ArrayLattice<Float> lat(arr);
// // Construct an iterator that returns the 128-element spectra one at a time
// ArrLatticeIter<Float> iter(lat, IPosition(3,1,1,128));
// // construct a Matrix to hold the results
// Matrix<Float> channelSum(64,64);
// // and do the summation one spectrum at a time
// for (iter.reset(); !iter.atEnd(); iter++)
// channelSum(iter.position().getFirst(2)) = sum(iter.cursor());
// </srcblock>
//
// There are more examples in the <linkto class=Lattice>Lattice</linkto> class
// and many of the examples in the
// <linkto class=PagedArray>PagedArray</linkto> class will also be instructive.
// </example>
// <motivation>
// We needed a way of creating Lattices but with Casacore Array characteristics.
// </motivation>
//# <todo asof="1997/05/31">
//# </todo>
// <linkfrom anchor="ArrayLattice" classes="Lattice PagedArray">
// <here>ArrayLattice</here> - a memory based Lattice.
// </linkfrom>
template <class T> class ArrayLattice : public Lattice<T>
{
//# Make members of parent class known.
public:
using Lattice<T>::ndim;
public:
// The default constructor creates a ArrayLattice that is useless for just
// about everything, except that it can be assigned to with the assignment
// operator.
ArrayLattice();
// Construct an ArrayLattice with the specified shape.
// It results in a writable lattice.
explicit ArrayLattice (const IPosition& shape);
// Construct an ArrayLattice that references the given Array.
// By default it results in a writable lattice.
ArrayLattice (Array<T>& array, Bool isWritable = True);
// Construct an ArrayLattice that references the given Array.
// It results in a non-writable lattice.
ArrayLattice (const Array<T>& array);
// The copy constructor uses reference semantics.
ArrayLattice (const ArrayLattice<T>& other);
virtual ~ArrayLattice();
// The assignment operator uses copy semantics.
ArrayLattice<T>& operator= (const ArrayLattice<T>& other);
// Make a copy of the object (reference semantics).
virtual Lattice<T>* clone() const;
// The lattice data can be referenced as an array section.
virtual Bool canReferenceArray() const;
// Is the lattice writable?
virtual Bool isWritable() const;
// returns the shape of the ArrayLattice.
virtual IPosition shape() const;
// Set all of the elements in the Lattice to a value.
virtual void set (const T& value);
// Return the Array of the data within this Lattice.
// <group>
Array<T>& asArray();
const Array<T>& asArray() const;
// </group>
// Return the value of the single element located at the argument
// IPosition.
// Note that operator() (defined in the base class) can also be used.
virtual T getAt (const IPosition& where) const;
// Put the value of a single element.
virtual void putAt (const T& value, const IPosition& where);
// Check for internal consistency. Returns False if
// something nasty has happened to the ArrayLattice.
virtual Bool ok() const;
// Returns the maximum recommended number of pixels for a cursor.
// For this class this is equal to the number of pixels in the lattice.
virtual uInt advisedMaxPixels() const;
// Get a slice in an optimized way (specifically for ArrLatticeIter).
// It returns in <src>buffer</src> a reference to the lattice array.
void getIterSlice (Array<T>& buffer, const IPosition& start,
const IPosition& end, const IPosition& incr);
protected:
// Do the actual getting of an array of values.
virtual Bool doGetSlice (Array<T>& buffer, const Slicer& section);
// Do the actual putting of an array of values.
virtual void doPutSlice (const Array<T>& sourceBuffer,
const IPosition& where,
const IPosition& stride);
private:
Array<T> itsData;
Bool itsWritable;
};
} //# NAMESPACE CASACORE - END
#ifndef CASACORE_NO_AUTO_TEMPLATES
#include <casacore/lattices/Lattices/ArrayLattice.tcc>
#endif //# CASACORE_NO_AUTO_TEMPLATES
#endif
casacore::ArrayLattice::getAt
virtual T getAt(const IPosition &where) const
Return the value of the single element located at the argument IPosition.
casacore::ArrayLattice::~ArrayLattice
virtual ~ArrayLattice()
casacore::ArrayLattice::canReferenceArray
virtual Bool canReferenceArray() const
The lattice data can be referenced as an array section.
casacore::ArrayLattice::operator=
ArrayLattice< T > & operator=(const ArrayLattice< T > &other)
The assignment operator uses copy semantics.
casacore::ArrayLattice::ArrayLattice
ArrayLattice(Array< T > &array, Bool isWritable=True)
Construct an ArrayLattice that references the given Array.
casacore::ArrayLattice::asArray
Array< T > & asArray()
Return the Array of the data within this Lattice.
casacore::ArrayLattice::ArrayLattice
ArrayLattice(const Array< T > &array)
Construct an ArrayLattice that references the given Array.
casacore::ArrayLattice::doGetSlice
virtual Bool doGetSlice(Array< T > &buffer, const Slicer &section)
Do the actual getting of an array of values.
casacore::ArrayLattice::ArrayLattice
ArrayLattice()
The default constructor creates a ArrayLattice that is useless for just about everything,...
casacore::ArrayLattice::doPutSlice
virtual void doPutSlice(const Array< T > &sourceBuffer, const IPosition &where, const IPosition &stride)
Do the actual putting of an array of values.
casacore::ArrayLattice::asArray
const Array< T > & asArray() const
casacore::ArrayLattice::ArrayLattice
ArrayLattice(const ArrayLattice< T > &other)
The copy constructor uses reference semantics.
casacore::ArrayLattice::itsWritable
Bool itsWritable
Definition ArrayLattice.h:228
casacore::ArrayLattice::ok
virtual Bool ok() const
Check for internal consistency.
casacore::ArrayLattice::shape
virtual IPosition shape() const
returns the shape of the ArrayLattice.
casacore::ArrayLattice::ArrayLattice
ArrayLattice(const IPosition &shape)
Construct an ArrayLattice with the specified shape.
casacore::ArrayLattice::isWritable
virtual Bool isWritable() const
Is the lattice writable?
casacore::ArrayLattice::getIterSlice
void getIterSlice(Array< T > &buffer, const IPosition &start, const IPosition &end, const IPosition &incr)
Get a slice in an optimized way (specifically for ArrLatticeIter).
casacore::ArrayLattice::itsData
Array< T > itsData
Definition ArrayLattice.h:227
casacore::ArrayLattice::clone
virtual Lattice< T > * clone() const
Make a copy of the object (reference semantics).
casacore::ArrayLattice::advisedMaxPixels
virtual uInt advisedMaxPixels() const
Returns the maximum recommended number of pixels for a cursor.
casacore::ArrayLattice::putAt
virtual void putAt(const T &value, const IPosition &where)
Put the value of a single element.
casacore::ArrayLattice::set
virtual void set(const T &value)
Set all of the elements in the Lattice to a value.
casacore::Array
Definition Array.h:155
casacore::IPosition
Definition IPosition.h:117
casacore::LatticeBase::ndim
virtual uInt ndim() const
Return the number of axes in this Lattice.
casacore::Lattice::Lattice
Lattice()
Define default constructor to satisfy compiler.
Definition Lattice.h:405
casacore::Slicer
Definition Slicer.h:287
casacore
this file contains all the compiler specific defines
Definition mainpage.dox:28
casacore::array
TYPE * array
the allocated array
Definition hdu.h:491
casacore::uInt
unsigned int uInt
Definition aipstype.h:49
casacore::Bool
bool Bool
Define the standard types used by Casacore.
Definition aipstype.h:40
casacore::True
const Bool True
Definition aipstype.h:41
casacore::value
NewDelAllocator< T > NewDelAllocator< T >::value
Definition Allocator.h:368