/usr/include/getfem/getfem_context.h is in libgetfem++-dev 4.2.1~beta1~svn4482~dfsg-2build1.
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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 | /* -*- c++ -*- (enables emacs c++ mode) */
/*===========================================================================
Copyright (C) 2004-2012 Yves Renard
This file is a part of GETFEM++
Getfem++ is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation; either version 3 of the License, or
(at your option) any later version along with the GCC Runtime Library
Exception either version 3.1 or (at your option) any later version.
This program 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 Lesser General Public
License and GCC Runtime Library Exception for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
As a special exception, you may use this file as it is a part of a free
software library without restriction. Specifically, if other files
instantiate templates or use macros or inline functions from this file,
or you compile this file and link it with other files to produce an
executable, this file does not by itself cause the resulting executable
to be covered by the GNU Lesser General Public License. This exception
does not however invalidate any other reasons why the executable file
might be covered by the GNU Lesser General Public License.
===========================================================================*/
/**@file getfem_context.h
@author Yves Renard <Yves.Renard@insa-lyon.fr>
@date June 17, 2004.
@brief Deal with interdependencies of objects (getfem::context_dependencies).
*/
#ifndef GETFEM_CONTEXT_H__
#define GETFEM_CONTEXT_H__
#include "getfem_config.h"
#include <list>
namespace getfem {
/**Deal with interdependencies of objects.
An object can be in three different states :
NORMAL : no change is necessary
CHANGED : something in the context has changed and the update function
of the object has to be called.
INVALID : one of the dependencies desappears, the object is invalid
and should no longer be used.
add_dependency(ct) : add a dependency to the dependency list.
touch() : significate to the dependent objects that something
has change in the object. This make the dependent
objects to be in the CHANGED state
context_check() : check if the object has to be updated. if it is the
case it makes first a check to the dependency list
and call the update function of the object.
(the update function of the dependencies are called
before the update function of the current object).
context_valid() : says if the object has still a valid context
Remarks :
- A protection against round dependencies exists. In this case, the
order of call of the update functions can be arbitrary
- Detection of context changes is very fast (control the
state). the touch operation can cover the whole tree of dependent
object. But this is the case only for the first touch operation
because once a dependent object is in the CHANGED state it will not
be considered by next touch operations.
*/
class context_dependencies {
protected :
enum context_state { CONTEXT_NORMAL, CONTEXT_CHANGED, CONTEXT_INVALID };
mutable context_state state;
mutable bool touched;
mutable std::vector<const context_dependencies *> dependencies;
mutable std::vector<const context_dependencies *> dependent;
typedef std::vector<const context_dependencies *>::iterator iterator_list;
void sup_dependent_(const context_dependencies &cd) const;
void sup_dependency_(const context_dependencies &cd) const;
void invalid_context(void) const;
public :
/** this function has to be defined and should update the object when
the context is modified. */
virtual void update_from_context(void) const = 0;
void change_context(void) const
{ if (state == CONTEXT_NORMAL) { state = CONTEXT_CHANGED; touch(); } }
void add_dependency(const context_dependencies &cd);
void sup_dependency(const context_dependencies &cd)
{ cd.sup_dependent_(*this); sup_dependency_(cd); }
bool is_context_valid(void) const { return (state != CONTEXT_INVALID); }
bool is_context_changed() const { return (state == CONTEXT_CHANGED); }
/** return true if update_from_context was called */
bool context_check(void) const;
void touch(void) const;
virtual ~context_dependencies();
context_dependencies() : state(CONTEXT_NORMAL), touched(false) {}
};
} /* end of namespace getfem. */
#endif /* GETFEM_CONTEXT_H__ */
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