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//# VisCalSolver2.h: Default solver for calibration using visibilities
//# Copyright (C) 1996,1997,2000,2001,2002,2003
//# 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 adressed as follows:
//# Internet email: aips2-request@nrao.edu.
//# Postal address: AIPS++ Project Office
//# National Radio Astronomy Observatory
//# 520 Edgemont Road
//# Charlottesville, VA 22903-2475 USA
//#
//#
namespace casa { //# NAMESPACE CASA - BEGIN
// <summary>
// VisCalSolver2: Default solver for calibration using visibility data
// </summary>
// <use visibility=export>
// <reviewed reviewer="" date="" tests="" demos="">
// <prerequisite>
// <li> <linkto class="MeasurementComponents">MeasurementComponents</linkto> module
// <li> <linkto class="VisEquation">VisEquation</linkto> module
// </prerequisite>
//
// <etymology>
// VisCal for visibility calibration (meaning solved from visibilities), Solver for
// solving.
// </etymology>
//
// <synopsis>
//
// VisCalSolver2 describes an interface for solving for calibration from visibility
// data in a VisBuffer. It hosts the communication of visibility data with otherwise
// generic solving mechanims. A Levenberg-Marquardt solver is supplied here by
// default, but it is intended that this class be the template for interfaces to
// third-party solving mechanisms.
//
// </synopsis>
//
// <example>
// <srcblock>
// </srcblock>
// </example>
//
// <motivation>
// It is desirable to establish the distinct communicative boundary between generic
// solving mechanims and the particulars of visibility data and calibration
// component descriptions. This class is intended to serve this purpose, by providing
// access to visibility data and calibration in terms of quantities necessary for
// least-squares (and other) style solvers.
// </motivation>
//
// <todo asof="97/10/01">
// </todo>
// **********************************************************
// VisCalSolver2
//