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# monoid_base.hh

    00001 // monoid_base.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, 2007 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_CONCEPT_MONOID_BASE_HH
    00018 # define VCSN_ALGEBRA_CONCEPT_MONOID_BASE_HH
    00019
    00020 # include <vaucanson/algebra/concept/semigroup_base.hh>
    00021
    00022 namespace vcsn {
    00023
    00024   namespace algebra {
    00025
    00029     /*-----------------.
    00030     | MonoidBase<Self> |
    00031     `-----------------*/
    00032
    00039     template<class Self>
    00040     struct MonoidBase : SemigroupBase<Self>
    00041     {
    00043       template<typename T>
    00044       Element<Self, T> identity(SELECTOR(T)) const;
    00045
    00047       template<typename T>
    00048       Element<Self, T> zero(SELECTOR(T)) const;
    00049
    00050     protected:
    00052       MonoidBase();
    00053
    00055       MonoidBase(const MonoidBase& other);
    00056     };
    00057
    00058     template <class T>
    00059     struct identity_as
    00060     {
    00061       template <class S>
    00062       static
    00063       Element<S, T> of(const S& s);
    00064     };
    00065
    00066     template <class T>
    00067     struct zero_as
    00068     {
    00069       template <class S>
    00070       static
    00071       Element<S, T> of(const S& s);
    00072     };
    00073
    00077   } // algebra
    00078
    00082   /*----------------------------------.
    00083   | dynamic_traits<MonoidBase<Self> > |
    00084   `----------------------------------*/
    00085
    00086   template<class Self>
    00087   struct dynamic_traits<algebra::MonoidBase<Self> >
    00088     : dynamic_traits<algebra::SemigroupBase<Self> >
    00089   { };
    00090
    00091   template<typename S>
    00092   struct virtual_types<algebra::MonoidBase<S> >
    00093     : virtual_types<algebra::SemigroupBase<S> >
    00094   { };
    00095
    00096   /*---------------------------------.
    00097   | MetaElement<MonoidBase<Self>, T> |
    00098   `---------------------------------*/
    00099
    00101   template<class Self, typename T>
    00102   struct MetaElement<algebra::MonoidBase<Self>, T>
    00103     : MetaElement<algebra::SemigroupBase<Self>, T>
    00104   {
    00105   protected:
    00107     MetaElement();
    00108
    00110     MetaElement(const MetaElement& other);
    00111   };
    00112
    00116   namespace algebra {
    00117
    00118     template<typename T, typename Self>
    00119     T op_default(SELECTOR(algebra::MonoidBase<Self>), SELECTOR(T));
    00120
    00121   } // algebra
    00122
    00123 } // vcsn
    00124
    00125 # if !defined VCSN_USE_INTERFACE_ONLY || defined VCSN_USE_LIB
    00126 #  include <vaucanson/algebra/concept/monoid_base.hxx>
    00127 # endif // VCSN_USE_INTERFACE_ONLY
    00128
    00129 #endif // ! VCSN_ALGEBRA_CONCEPT_MONOID_BASE_HH