Milena (Olena)
User documentation 2.0a Id
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00001 // Copyright (C) 2007, 2008, 2009 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_CORE_CONCEPT_META_ACCUMULATOR_HH 00028 # define MLN_CORE_CONCEPT_META_ACCUMULATOR_HH 00029 00033 00034 # include <mln/core/concept/object.hh> 00035 # include <mln/core/concept/accumulator.hh> 00036 00037 00038 # define mln_accu_with(A, T) \ 00039 typename mln::internal::accu_with_helper<A,T>::ret 00040 00041 # define mln_accu_with_(A, T) \ 00042 mln::internal::accu_with_helper<A,T>::ret 00043 00044 00045 # define mln_meta_accu_result(A, T) \ 00046 typename mln::internal::meta_accu_ret_result_helper<A,T>::result 00047 00048 00049 # define mln_meta_accu_result_(A, T) \ 00050 mln::internal::meta_accu_ret_result_helper<A,T>::result 00051 00052 00053 00054 00055 namespace mln 00056 { 00057 00058 // Forward declaration. 00059 template <typename E> struct Meta_Accumulator; 00060 00061 00062 namespace internal 00063 { 00064 00067 // 00068 template <typename A, typename T> 00069 struct meta_accu_ret_result_helper 00070 { 00071 typedef typename A::template with< T >::ret::result result; 00072 }; 00073 00074 00077 // 00078 template <typename A, typename T> 00079 struct accu_with_helper 00080 { 00081 typedef typename A::template with< T >::ret ret; 00082 }; 00083 00084 00085 } // end of namespace mln::internal 00086 00087 00088 // Meta_Accumulator category flag type. 00089 template <> 00090 struct Meta_Accumulator<void> 00091 { 00092 typedef Object<void> super; 00093 }; 00094 00102 template <typename E> 00103 struct Meta_Accumulator : public Object<E> 00104 { 00105 typedef Meta_Accumulator<void> category; 00106 protected: 00107 Meta_Accumulator(); 00108 }; 00109 00110 00111 namespace accu 00112 { 00113 00114 // To be specialized when some state (attributes) have to be transfered 00115 // from the meta-accumulator to the accumulator. 00116 // Warning: the first argument has to be an object with the exact type. 00117 template <typename M, typename T> 00118 mln_accu_with(M, T) 00119 unmeta(const M&, T); 00120 00121 template <typename M, typename T> 00122 void 00123 unmeta(const Meta_Accumulator<M>&, T); // Safety. 00124 00125 } // end of namespace mln::accu 00126 00127 00128 00129 # ifndef MLN_INCLUDE_ONLY 00130 00131 template <typename E> 00132 inline 00133 Meta_Accumulator<E>::Meta_Accumulator() 00134 { 00135 // FIXME: Check "with" on E. 00136 } 00137 00138 namespace accu 00139 { 00140 00141 template <typename M, typename T> 00142 inline 00143 mln_accu_with(M, T) 00144 unmeta(const M&, T) 00145 { 00146 mlc_is_a(M, Meta_Accumulator)::check(); 00147 mln_accu_with(M, T) a; 00148 return a; 00149 } 00150 00151 } // end of namespace mln::accu 00152 00153 # endif // ! MLN_INCLUDE_ONLY 00154 00155 } // end of namespace mln 00156 00157 00158 #endif // ! MLN_CORE_CONCEPT_META_ACCUMULATOR_HH