Milena (Olena)  User documentation 2.0a Id
one.hh
00001 // Copyright (C) 2007, 2008, 2009, 2011 EPITA Research and Development
00002 // Laboratory (LRDE)
00003 //
00004 // This file is part of Olena.
00005 //
00006 // Olena is free software: you can redistribute it and/or modify it under
00007 // the terms of the GNU General Public License as published by the Free
00008 // Software Foundation, version 2 of the License.
00009 //
00010 // Olena is distributed in the hope that it will be useful,
00011 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00012 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013 // General Public License for more details.
00014 //
00015 // You should have received a copy of the GNU General Public License
00016 // along with Olena.  If not, see <http://www.gnu.org/licenses/>.
00017 //
00018 // As a special exception, you may use this file as part of a free
00019 // software project without restriction.  Specifically, if other files
00020 // instantiate templates or use macros or inline functions from this
00021 // file, or you compile this file and link it with other files to produce
00022 // an executable, this file does not by itself cause the resulting
00023 // executable to be covered by the GNU General Public License.  This
00024 // exception does not however invalidate any other reasons why the
00025 // executable file might be covered by the GNU General Public License.
00026 
00027 #ifndef MLN_LITERAL_ONE_HH
00028 # define MLN_LITERAL_ONE_HH
00029 
00033 
00034 # include <mln/core/concept/literal.hh>
00035 # include <mln/metal/converts_to.hh>
00036 
00037 
00038 namespace mln
00039 {
00040 
00041   namespace literal
00042   {
00043 
00045     struct one_t : public Literal<one_t>
00046     {
00047       // This default constructor is needed for compilation with gcc
00048       // 4.6.0, gcc 4.6.1 and Clang.
00049       one_t();
00050 
00051       // FIXME: Cf. comments in literal/zero.hh.
00052 
00053       template <typename T>
00054       operator const T () const;
00055     };
00056 
00057 
00059     extern const one_t one;
00060 
00061 
00062 # ifndef MLN_INCLUDE_ONLY
00063 
00064     inline
00065     one_t::one_t()
00066     {
00067     }
00068 
00069     template <typename T>
00070     inline
00071     one_t::operator const T () const
00072     {
00073       mlc_converts_to(int, T)::check();
00074       return 1;
00075     }
00076 
00077 #  ifndef MLN_WO_GLOBAL_VARS
00078 
00079     const one_t one;
00080 
00081 #  endif // !MLN_WO_GLOBAL_VARS
00082 
00083 # endif // ! MLN_INCLUDE_ONLY
00084 
00085   } // end of namespace mln::literal
00086 
00087 } // end of namespace mln
00088 
00089 
00090 #endif // ! MLN_LITERAL_ONE_HH
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