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//# WrapperBase.h: Aid in constructing function objects from C++ functions
//# Copyright (C) 2001,2002
//# 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 SCIMATH_WRAPPERBASE_H
#define SCIMATH_WRAPPERBASE_H
//# Includes
#include <casacore/casa/aips.h>
#include <casacore/scimath/Functionals/Function.h>
#include <casacore/casa/Arrays/Vector.h>
namespace casacore { //# NAMESPACE CASACORE - BEGIN
//# Forward declarations
// <summary> Aid in constructing function objects from C++ functions
// </summary>
//
// <use visibility=local>
//
// <reviewed reviewer="UNKNOWN" date="before2004/08/25" tests="" demos="">
// </reviewed>
//
// <prerequisite>
// <li> <linkto class="FunctionWrapper">FunctionWrapper</linkto> class
// <li> <linkto class="WrapperData">WrapperData</linkto> class
// </prerequisite>
//
// <synopsis>
// This base class is provided to enable compile time selection of the
// appropriate function call through <src>WrapperData</src>.
// </synopsis>
//
// <example>
// <srcblock>
// Float func(const Vector<Float>& x) { return x(0)*x(1); } // x*y
// // Convert C++ functions to Functionals
// FunctionWrapper<Float> Func(func, 2);
// </srcblock>
//
template<class T> class WrapperBase {
public:
//# Constructors
// Default constructor: zero dimension
WrapperBase() : ndim_p(0), arg_p(0) {}
// Standard constructor
explicit WrapperBase(const uInt dim) : ndim_p(dim), arg_p(dim) {}
// Destructor
virtual ~WrapperBase() {}
//# Operators
// Evaluate the function at <src>x</src>.
// <group>
virtual T eval(typename Function<T>::FunctionArg x,
const Vector<T> &par) const = 0;
// </group>
//# Member functions
// Get the dimensionality
virtual uInt ndim() const { return ndim_p; }
protected:
//# Data
// Dimensionality
uInt ndim_p;
// Vector argument interface
mutable Vector<T> arg_p;
private:
// Copy constructor and assignment (not implemented)
// <group>
WrapperBase(const WrapperBase<T> &other);
WrapperBase<T> &operator=(const WrapperBase<T> &other);
// </group>
};
} //# NAMESPACE CASACORE - END
#endif
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