/usr/include/rheolef/field_functor.h is in librheolef-dev 6.5-1+b1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 | #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
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