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# deferrer.hxx

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    00001 // deferrer.hxx: this file is part of the Vaucanson project.
    00002 //
    00003 // Vaucanson, a generic library for finite state machines.
    00004 //
    00005 // Copyright (C) 2004, 2005, 2006, 2008, 2011 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_MISC_DEFERRER_HXX
    00018 # define VCSN_MISC_DEFERRER_HXX
    00019
    00031 # include <vaucanson/misc/deferrer.hh>
    00032 # include <vaucanson/misc/contract.hh>
    00033
    00034 # include <new>
    00035 # include <cstdlib>
    00036 # include <cstring>
    00037
    00038 namespace vcsn
    00039 {
    00040   namespace misc
    00041   {
    00042
    00045   /*-----------------------------------------------.
    00046   | DeferrerDebugPart, with runtime tests enabled  |
    00047   `-----------------------------------------------*/
    00048
    00049     template <class T, bool B>
    00050     DeferrerDebugPart<T, B>::DeferrerDebugPart (void* ptr, bool is_valid) :
    00051       is_valid_ (is_valid)
    00052     {
    00053       memset (ptr, 0, sizeof (T));
    00054     }
    00055
    00056     template <class T, bool B>
    00057     void
    00058     DeferrerDebugPart<T, B>::set_valid (bool b)
    00059     {
    00060       if (is_valid_)
    00061         WARNING ("Modifying a valid Deferrer<T, true>.");
    00062       is_valid_ = b;
    00063     }
    00064
    00065     template <class T, bool B>
    00066     T&
    00067     DeferrerDebugPart<T, B>::cast (void *ptr)
    00068     {
    00069       precondition (is_valid_);
    00070       return *reinterpret_cast<T*> (ptr);
    00071     }
    00072
    00073     template <class T, bool B>
    00074     const T&
    00075     DeferrerDebugPart<T, B>::cast (const void *ptr) const
    00076     {
    00077       precondition (is_valid_);
    00078       return *reinterpret_cast<const T*> (ptr);
    00079     }
    00080
    00081   /*-------------------------------------------------.
    00082   | DeferrerDebugPart, with runtime tests *disabled* |
    00083   `-------------------------------------------------*/
    00084
    00085     template <class T>
    00086     DeferrerDebugPart<T, false>::DeferrerDebugPart (void*, bool)
    00087     {
    00088     }
    00089
    00090     template <class T>
    00091     void
    00092     DeferrerDebugPart<T, false>::set_valid (bool)
    00093     {
    00094     }
    00095
    00096     template <class T>
    00097     T&
    00098     DeferrerDebugPart<T, false>::cast (void *ptr)
    00099     {
    00100       return *reinterpret_cast<T*> (ptr);
    00101     }
    00102
    00103     template <class T>
    00104     const T&
    00105     DeferrerDebugPart<T, false>::cast (const void *ptr) const
    00106     {
    00107       return *reinterpret_cast<const T*> (ptr);
    00108     }
    00109
    00110   /*---------.
    00111   | Deferrer |
    00112   `---------*/
    00113
    00114     template <class T, bool rt_checks>
    00115     Deferrer<T, rt_checks>::Deferrer () : DeferrerDebugPart<T, rt_checks> (data)
    00116     {
    00117     }
    00118
    00119     template <class T, bool rt_checks>
    00120     Deferrer<T, rt_checks>&
    00121     Deferrer<T, rt_checks>::operator= (const deferred_type& rhs)
    00122     {
    00123       new (data) deferred_type (rhs);
    00124       this->set_valid (true);
    00125       return *this;
    00126     }
    00127
    00128     template <class T, bool rt_checks>
    00129     Deferrer<T, rt_checks>::operator T () const
    00130     {
    00131       return this->cast (data);
    00132     }
    00133
    00135   } // End of namespace misc.
    00136 } // End of namespace vcsn.
    00137
    00138 #endif // ! VCSN_MISC_DEFERRER_HXX