8dbc9424c1
runs. * src/tgbaalgos/bfssteps.hh, src/tgbaalgos/bfssteps.cc: Add the method finalize witch compute (by default) the traversed path. * src/tgbaalgos/magic.cc, src/tgbaalgos/se05.cc: Fix a bug concerning the heap used for bit state hashing version and ajust the prototype of has_been_visited and pop_notify. * src/tgbaalgos/tau03.cc, src/tgbaalgos/tau03opt.cc: ajust the prototype of has_been_visited and pop_notify.
102 lines
3.8 KiB
C++
102 lines
3.8 KiB
C++
// Copyright (C) 2004 Laboratoire d'Informatique de Paris 6 (LIP6),
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// département Systèmes Répartis Coopératifs (SRC), Université Pierre
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// et Marie Curie.
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//
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// This file is part of Spot, a model checking library.
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//
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// Spot is free software; you can redistribute it and/or modify it
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// under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// Spot is distributed in the hope that it will be useful, but WITHOUT
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// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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// License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Spot; see the file COPYING. If not, write to the Free
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// Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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// 02111-1307, USA.
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#ifndef SPOT_TGBAALGOS_BFSSTEPS_HH
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# define SPOT_TGBAALGOS_BFSSTEPS_HH
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#include <map>
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#include "tgba/state.hh"
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#include "emptiness.hh"
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namespace spot
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{
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/// \brief Make a BFS in a spot::tgba to compute a tgba_run::steps.
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/// \ingroup tgba_misc
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///
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/// This class should be used to compute the shortest path
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/// between a state of a spot::tgba and the first transition or
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/// state that matches some conditions.
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///
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/// These conditions should be specified by defining bfs_steps::match()
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/// in a subclass. Also the search can be restricted to some set of
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/// states with a proper definition of bfs_steps::filter().
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class bfs_steps
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{
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public:
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bfs_steps(const tgba* a);
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virtual ~bfs_steps();
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/// \brief Start the search from \a start, and append the
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/// resulting path (if any) to \a l.
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///
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/// \return the destination state of the last step (not included
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/// in \a l) if a matching path was found, or 0 otherwise.
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const state* search(const state* start, tgba_run::steps& l);
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/// \brief Return a state* that is unique for \a a.
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///
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/// bfs_steps does not do handle the memory for the states it
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/// generates, this is the job of filter(). Here \a s is a new
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/// state* that search() has just allocated (using
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/// tgba_succ_iterator::current_state()), and the return of this
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/// function should be a state* that does not need to be freed by
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/// search().
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///
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/// If you already have a map or a set which uses states as keys,
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/// you should probably arrange for filter() to return these keys,
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/// and delete \a s. Otherwise you will have to define such a
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/// set, just to be able to delete all the state* in a subclass.
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///
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/// This function can return 0 if the given state should not be
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/// explored.
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virtual const state* filter(const state* s) = 0;
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/// \brief Whether a new transition completes a path.
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///
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/// This function is called immediately after each call to
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/// filter() that does not return 0.
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///
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/// \param step the source state (as returned by filter()), and the
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/// labels of the outgoing transition
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/// \param dest the destination state (as returned by filter())
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/// \return true iff a path that included this step should be accepted.
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///
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/// The search() algorithms stops as soon as match() returns true,
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/// and when this happens the list argument of search() is be
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/// augmented with the shortest past that ends with this
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/// transition.
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virtual bool match(tgba_run::step& step, const state* dest) = 0;
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virtual void finalize(const std::map<const state*,
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tgba_run::step,
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state_ptr_less_than>& father,
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const tgba_run::step& s,
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const state* start,
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tgba_run::steps& l);
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protected:
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const tgba* a_; ///< The spot::tgba we are searching into.
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};
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}
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#endif // SPOT_TGBAALGOS_BFSSTEPS_HH
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