Vaucanson 1.4
automaton_tools.hh
00001 // automaton_tools.hh: this file is part of the Vaucanson project.
00002 //
00003 // Vaucanson, a generic library for finite state machines.
00004 //
00005 // Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006 The Vaucanson Group.
00006 //
00007 // This program is free software; you can redistribute it and/or
00008 // modify it under the terms of the GNU General Public License
00009 // as published by the Free Software Foundation; either version 2
00010 // of the License, or (at your option) any later version.
00011 //
00012 // The complete GNU General Public Licence Notice can be found as the
00013 // `COPYING' file in the root directory.
00014 //
00015 // The Vaucanson Group consists of people listed in the `AUTHORS' file.
00016 //
00017 #ifndef VCSN_TOOLS_AUTOMATON_TOOLS_HH
00018 # define VCSN_TOOLS_AUTOMATON_TOOLS_HH
00019 
00020 # include <algorithm>
00021 # include <deque>
00022 # include <vaucanson/automata/concept/automata.hh>
00023 # include <vaucanson/misc/random.hh>
00024 
00025 namespace vcsn
00026 {
00027   namespace tools
00028   {
00029     template <class Auto>
00030     std::deque<typename Auto::hstate_t>
00031     choose_n_states(const Auto& a, unsigned n)
00032     {
00033       typedef typename Auto::hstate_t hstate_t;
00034 
00035       std::deque<typename Auto::hstate_t> s;
00036       std::insert_iterator<std::deque<hstate_t> > i(s, s.begin());
00037       misc::random::sample_n(hstate_t(),
00038                              a.states().begin(),
00039                              a.states().end(),
00040                              i,
00041                              n);
00042       return s;
00043     }
00044   } // tools
00045 } // vcsn
00046 
00047 #endif // ! VCSN_TOOLS_AUTOMATON_TOOLS_HH