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# char_letter.hxx

    00001 // char_letter.hxx: this file is part of the Vaucanson project.
    00002 //
    00003 // Vaucanson, a generic library for finite state machines.
    00004 //
    00005 // Copyright (C) 2008 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_ALGEBRA_IMPLEMENTATION_LETTER_CHAR_LETTER_HXX
    00018 # define VCSN_ALGEBRA_IMPLEMENTATION_LETTER_CHAR_LETTER_HXX
    00019
    00020 # include <string>
    00021 # include <utility>
    00022
    00023 # include <vaucanson/algebra/implementation/letter/char_letter.hh>
    00024
    00025 namespace vcsn
    00026 {
    00027   namespace algebra
    00028   {
    00029     template <>
    00030     struct letter_traits<char>
    00031     {
    00032       // This letter type needs one char to be displayed.
    00033       typedef misc::true_t is_char_letter;
    00034
    00035       enum
    00036       {
    00037         // Here we use 255 and not 256 because random::generate<char>
    00038         // does not generates 0 to avoid conflicts with 0 terminated
    00039         // C strings. Therefore char alphabets will never hold more
    00040         // than 255 different letters.
    00041         cardinal = 255
    00042       };
    00043
    00044       // We can not "project" a char letter.
    00045       typedef undefined_type first_projection_t;
    00046       typedef undefined_type second_projection_t;
    00047
    00048       // FIXME: use LETTER_DEFAULT
    00049       static char default_joker()   { return '?'; }
    00050       static char default_other()   { return '#'; }
    00051
    00052       static
    00053       std::pair<bool, char>
    00054       literal_to_letter(const std::string& str)
    00055       {
    00056         // Check for the size of the input (a char is a one sized string).
    00057         if (str.size() != 1)
    00058           return std::make_pair(false, 0);
    00059
    00060         return std::make_pair(true, str[0]);
    00061       }
    00062
    00063       static
    00064       std::string
    00065       letter_to_literal(const char& c)
    00066       {
    00067         std::string str;
    00068         str = str + c;
    00069         return str;
    00070       }
    00071
    00072       // A char is "simple" with dimension 1.
    00073       static std::string kind() { return "simple"; }
    00074       static int dim() { return 1; }
    00075
    00076     };
    00077
    00078   } // ! algebra
    00079
    00080 } // ! vcsn
    00081
    00082 #endif // ! VCSN_ALGEBRA_IMPLEMENTATION_LETTER_CHAR_LETTER_HXX