libstdc++
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00001 // The template and inlines for the -*- C++ -*- gslice_array class. 00002 00003 // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2004, 2005, 2009, 2010 00004 // Free Software Foundation, Inc. 00005 // 00006 // This file is part of the GNU ISO C++ Library. This library is free 00007 // software; you can redistribute it and/or modify it under the 00008 // terms of the GNU General Public License as published by the 00009 // Free Software Foundation; either version 3, or (at your option) 00010 // any later version. 00011 00012 // This library is distributed in the hope that it will be useful, 00013 // but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00015 // GNU General Public License for more details. 00016 00017 // Under Section 7 of GPL version 3, you are granted additional 00018 // permissions described in the GCC Runtime Library Exception, version 00019 // 3.1, as published by the Free Software Foundation. 00020 00021 // You should have received a copy of the GNU General Public License and 00022 // a copy of the GCC Runtime Library Exception along with this program; 00023 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 00024 // <http://www.gnu.org/licenses/>. 00025 00026 /** @file bits/gslice_array.h 00027 * This is an internal header file, included by other library headers. 00028 * Do not attempt to use it directly. @headername{valarray} 00029 */ 00030 00031 // Written by Gabriel Dos Reis <Gabriel.Dos-Reis@DPTMaths.ENS-Cachan.Fr> 00032 00033 #ifndef _GSLICE_ARRAY_H 00034 #define _GSLICE_ARRAY_H 1 00035 00036 #pragma GCC system_header 00037 00038 namespace std _GLIBCXX_VISIBILITY(default) 00039 { 00040 _GLIBCXX_BEGIN_NAMESPACE_VERSION 00041 00042 /** 00043 * @addtogroup numeric_arrays 00044 * @{ 00045 */ 00046 00047 /** 00048 * @brief Reference to multi-dimensional subset of an array. 00049 * 00050 * A gslice_array is a reference to the actual elements of an array 00051 * specified by a gslice. The way to get a gslice_array is to call 00052 * operator[](gslice) on a valarray. The returned gslice_array then 00053 * permits carrying operations out on the referenced subset of elements in 00054 * the original valarray. For example, operator+=(valarray) will add 00055 * values to the subset of elements in the underlying valarray this 00056 * gslice_array refers to. 00057 * 00058 * @param Tp Element type. 00059 */ 00060 template<typename _Tp> 00061 class gslice_array 00062 { 00063 public: 00064 typedef _Tp value_type; 00065 00066 // _GLIBCXX_RESOLVE_LIB_DEFECTS 00067 // 253. valarray helper functions are almost entirely useless 00068 00069 /// Copy constructor. Both slices refer to the same underlying array. 00070 gslice_array(const gslice_array&); 00071 00072 /// Assignment operator. Assigns slice elements to corresponding 00073 /// elements of @a a. 00074 gslice_array& operator=(const gslice_array&); 00075 00076 /// Assign slice elements to corresponding elements of @a v. 00077 void operator=(const valarray<_Tp>&) const; 00078 /// Multiply slice elements by corresponding elements of @a v. 00079 void operator*=(const valarray<_Tp>&) const; 00080 /// Divide slice elements by corresponding elements of @a v. 00081 void operator/=(const valarray<_Tp>&) const; 00082 /// Modulo slice elements by corresponding elements of @a v. 00083 void operator%=(const valarray<_Tp>&) const; 00084 /// Add corresponding elements of @a v to slice elements. 00085 void operator+=(const valarray<_Tp>&) const; 00086 /// Subtract corresponding elements of @a v from slice elements. 00087 void operator-=(const valarray<_Tp>&) const; 00088 /// Logical xor slice elements with corresponding elements of @a v. 00089 void operator^=(const valarray<_Tp>&) const; 00090 /// Logical and slice elements with corresponding elements of @a v. 00091 void operator&=(const valarray<_Tp>&) const; 00092 /// Logical or slice elements with corresponding elements of @a v. 00093 void operator|=(const valarray<_Tp>&) const; 00094 /// Left shift slice elements by corresponding elements of @a v. 00095 void operator<<=(const valarray<_Tp>&) const; 00096 /// Right shift slice elements by corresponding elements of @a v. 00097 void operator>>=(const valarray<_Tp>&) const; 00098 /// Assign all slice elements to @a t. 00099 void operator=(const _Tp&) const; 00100 00101 template<class _Dom> 00102 void operator=(const _Expr<_Dom, _Tp>&) const; 00103 template<class _Dom> 00104 void operator*=(const _Expr<_Dom, _Tp>&) const; 00105 template<class _Dom> 00106 void operator/=(const _Expr<_Dom, _Tp>&) const; 00107 template<class _Dom> 00108 void operator%=(const _Expr<_Dom, _Tp>&) const; 00109 template<class _Dom> 00110 void operator+=(const _Expr<_Dom, _Tp>&) const; 00111 template<class _Dom> 00112 void operator-=(const _Expr<_Dom, _Tp>&) const; 00113 template<class _Dom> 00114 void operator^=(const _Expr<_Dom, _Tp>&) const; 00115 template<class _Dom> 00116 void operator&=(const _Expr<_Dom, _Tp>&) const; 00117 template<class _Dom> 00118 void operator|=(const _Expr<_Dom, _Tp>&) const; 00119 template<class _Dom> 00120 void operator<<=(const _Expr<_Dom, _Tp>&) const; 00121 template<class _Dom> 00122 void operator>>=(const _Expr<_Dom, _Tp>&) const; 00123 00124 private: 00125 _Array<_Tp> _M_array; 00126 const valarray<size_t>& _M_index; 00127 00128 friend class valarray<_Tp>; 00129 00130 gslice_array(_Array<_Tp>, const valarray<size_t>&); 00131 00132 // not implemented 00133 gslice_array(); 00134 }; 00135 00136 template<typename _Tp> 00137 inline 00138 gslice_array<_Tp>::gslice_array(_Array<_Tp> __a, 00139 const valarray<size_t>& __i) 00140 : _M_array(__a), _M_index(__i) {} 00141 00142 template<typename _Tp> 00143 inline 00144 gslice_array<_Tp>::gslice_array(const gslice_array<_Tp>& __a) 00145 : _M_array(__a._M_array), _M_index(__a._M_index) {} 00146 00147 template<typename _Tp> 00148 inline gslice_array<_Tp>& 00149 gslice_array<_Tp>::operator=(const gslice_array<_Tp>& __a) 00150 { 00151 std::__valarray_copy(_Array<_Tp>(__a._M_array), 00152 _Array<size_t>(__a._M_index), _M_index.size(), 00153 _M_array, _Array<size_t>(_M_index)); 00154 return *this; 00155 } 00156 00157 template<typename _Tp> 00158 inline void 00159 gslice_array<_Tp>::operator=(const _Tp& __t) const 00160 { 00161 std::__valarray_fill(_M_array, _Array<size_t>(_M_index), 00162 _M_index.size(), __t); 00163 } 00164 00165 template<typename _Tp> 00166 inline void 00167 gslice_array<_Tp>::operator=(const valarray<_Tp>& __v) const 00168 { 00169 std::__valarray_copy(_Array<_Tp>(__v), __v.size(), 00170 _M_array, _Array<size_t>(_M_index)); 00171 } 00172 00173 template<typename _Tp> 00174 template<class _Dom> 00175 inline void 00176 gslice_array<_Tp>::operator=(const _Expr<_Dom, _Tp>& __e) const 00177 { 00178 std::__valarray_copy (__e, _M_index.size(), _M_array, 00179 _Array<size_t>(_M_index)); 00180 } 00181 00182 #undef _DEFINE_VALARRAY_OPERATOR 00183 #define _DEFINE_VALARRAY_OPERATOR(_Op, _Name) \ 00184 template<typename _Tp> \ 00185 inline void \ 00186 gslice_array<_Tp>::operator _Op##=(const valarray<_Tp>& __v) const \ 00187 { \ 00188 _Array_augmented_##_Name(_M_array, _Array<size_t>(_M_index), \ 00189 _Array<_Tp>(__v), __v.size()); \ 00190 } \ 00191 \ 00192 template<typename _Tp> \ 00193 template<class _Dom> \ 00194 inline void \ 00195 gslice_array<_Tp>::operator _Op##= (const _Expr<_Dom, _Tp>& __e) const\ 00196 { \ 00197 _Array_augmented_##_Name(_M_array, _Array<size_t>(_M_index), __e,\ 00198 _M_index.size()); \ 00199 } 00200 00201 _DEFINE_VALARRAY_OPERATOR(*, __multiplies) 00202 _DEFINE_VALARRAY_OPERATOR(/, __divides) 00203 _DEFINE_VALARRAY_OPERATOR(%, __modulus) 00204 _DEFINE_VALARRAY_OPERATOR(+, __plus) 00205 _DEFINE_VALARRAY_OPERATOR(-, __minus) 00206 _DEFINE_VALARRAY_OPERATOR(^, __bitwise_xor) 00207 _DEFINE_VALARRAY_OPERATOR(&, __bitwise_and) 00208 _DEFINE_VALARRAY_OPERATOR(|, __bitwise_or) 00209 _DEFINE_VALARRAY_OPERATOR(<<, __shift_left) 00210 _DEFINE_VALARRAY_OPERATOR(>>, __shift_right) 00211 00212 #undef _DEFINE_VALARRAY_OPERATOR 00213 00214 // @} group numeric_arrays 00215 00216 _GLIBCXX_END_NAMESPACE_VERSION 00217 } // namespace 00218 00219 #endif /* _GSLICE_ARRAY_H */