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#ifndef _RHEOLEF_FIELD_FUNCTOR_H
#define _RHEOLEF_FIELD_FUNCTOR_H
//
// This file is part of Rheolef.
//
// Copyright (C) 2000-2009 Pierre Saramito 
//
// Rheolef is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
// 
// Rheolef 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Rheolef; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
// 
// ==========================================================================
// 
// field_vf: template expressions
//
// author: Pierre.Saramito@imag.fr
//
// date: 20 march 2011
//
#include "rheolef/point.h"

#ifdef _RHEOLEF_HAVE_CXX_STD_2011
#include <functional>         // for std::function;
#else
#include <boost/function.hpp> // for boost::function;
#endif

namespace rheolef {

#ifdef _RHEOLEF_HAVE_CXX_STD_2011
using std::function;
#else
using boost::function;
#endif

/*Class:field_functor
NAME:  @code{field_functor} - a functor wrapper suitable for field expressions
DESCRIPTION:       
  @noindent
  A functor is a class-function, i.e. a class that defines
  the @code{operator()}. A variable @code{f} of a class-function can be
  used as @code{f(arg)} and when its argument is of type @code{point}
  @pxref{point class}, the function @code{f} interprets as a continuous field field.
  Thus, it can be interpolated @pxref{interpolate algorithm} and
  it can be combined within field expressions @pxref{field class}
  that appears in arguments of @pxref{integrate algorithm}.
EXAMPLE:
  @example
    struct f : field_functor<f,Float> @{
      Float operator() (const point& x) const @{ return 1-norm(x); @}
    @};
    // ...
    geo omega ("square");
    space Xh (omega, "P1");
    field fh = interpolate (Xh, f);
    test  (Xh);
    field lh = integrate (f*v);
  @end example
IMPLEMENTATION NOTE:
  The current implementation of a @code{field_functor} class
  bases on the curiously recurring template pattern (CRTP) C++ idiom:
  the definition of the class @code{f} derives from
  @code{field_functor}<@code{f},Float> that depend itself upon @code{f}.
  So, be carrefull when using copy-paste, as there is no checks if
  you write e.g. @code{field_functor}<@code{g},Float> with another function @code{g}
  instead of @code{f}.
AUTHOR: Pierre.Saramito@imag.fr
DATE:   12 march 2013
End:
*/
//<doc:
template <class Function, class Result>
struct field_functor
  : std::unary_function<point_basic<float_traits<Result> >,Result> {
 const Function& get_ref() const { return static_cast<const Function&>(*this); }
 operator Function() const { return get_ref(); }
 Result operator() (const point& x) const { return get_ref().operator()(x); }
};
#ifdef TODO
// transforme a function or a functor into a field_functor, suitable for expressions mixing field and functions
template <class F, class R>
struct field_function_s : field_functor<field_function_s<F,R>, R> {
  typedef typename float_traits<R>::type float_type;
  R operator() (const point_basic<float_type>& x) const { return _f.operator()(x); }
  field_function_s(F f) : _f(f) {}
  F _f;
};
template <class F>
field_function_s<function<F>, typename F::result_type>
field_function (F f) {
  typedef typename F::result_type R;
  return field_function_s<function<F>,R>(function<F>(f));
}
#endif // TODO

//>doc:


} // namespace rheolef
#endif // _RHEOLEF_FIELD_FUNCTOR_H