libstdc++
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00001 // The template and inlines for the -*- C++ -*- indirect_array class. 00002 00003 // Copyright (C) 1997-2013 Free Software Foundation, Inc. 00004 // 00005 // This file is part of the GNU ISO C++ Library. This library is free 00006 // software; you can redistribute it and/or modify it under the 00007 // terms of the GNU General Public License as published by the 00008 // Free Software Foundation; either version 3, or (at your option) 00009 // any later version. 00010 00011 // This library is distributed in the hope that it will be useful, 00012 // but WITHOUT ANY WARRANTY; without even the implied warranty of 00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00014 // GNU General Public License for more details. 00015 00016 // Under Section 7 of GPL version 3, you are granted additional 00017 // permissions described in the GCC Runtime Library Exception, version 00018 // 3.1, as published by the Free Software Foundation. 00019 00020 // You should have received a copy of the GNU General Public License and 00021 // a copy of the GCC Runtime Library Exception along with this program; 00022 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 00023 // <http://www.gnu.org/licenses/>. 00024 00025 /** @file bits/indirect_array.h 00026 * This is an internal header file, included by other library headers. 00027 * Do not attempt to use it directly. @headername{valarray} 00028 */ 00029 00030 // Written by Gabriel Dos Reis <Gabriel.Dos-Reis@DPTMaths.ENS-Cachan.Fr> 00031 00032 #ifndef _INDIRECT_ARRAY_H 00033 #define _INDIRECT_ARRAY_H 1 00034 00035 #pragma GCC system_header 00036 00037 namespace std _GLIBCXX_VISIBILITY(default) 00038 { 00039 _GLIBCXX_BEGIN_NAMESPACE_VERSION 00040 00041 /** 00042 * @addtogroup numeric_arrays 00043 * @{ 00044 */ 00045 00046 /** 00047 * @brief Reference to arbitrary subset of an array. 00048 * 00049 * An indirect_array is a reference to the actual elements of an array 00050 * specified by an ordered array of indices. The way to get an 00051 * indirect_array is to call operator[](valarray<size_t>) on a valarray. 00052 * The returned indirect_array then permits carrying operations out on the 00053 * referenced subset of elements in the original valarray. 00054 * 00055 * For example, if an indirect_array is obtained using the array (4,2,0) as 00056 * an argument, and then assigned to an array containing (1,2,3), then the 00057 * underlying array will have array[0]==3, array[2]==2, and array[4]==1. 00058 * 00059 * @param Tp Element type. 00060 */ 00061 template <class _Tp> 00062 class indirect_array 00063 { 00064 public: 00065 typedef _Tp value_type; 00066 00067 // _GLIBCXX_RESOLVE_LIB_DEFECTS 00068 // 253. valarray helper functions are almost entirely useless 00069 00070 /// Copy constructor. Both slices refer to the same underlying array. 00071 indirect_array(const indirect_array&); 00072 00073 /// Assignment operator. Assigns elements to corresponding elements 00074 /// of @a a. 00075 indirect_array& operator=(const indirect_array&); 00076 00077 /// Assign slice elements to corresponding elements of @a v. 00078 void operator=(const valarray<_Tp>&) const; 00079 /// Multiply slice elements by corresponding elements of @a v. 00080 void operator*=(const valarray<_Tp>&) const; 00081 /// Divide slice elements by corresponding elements of @a v. 00082 void operator/=(const valarray<_Tp>&) const; 00083 /// Modulo slice elements by corresponding elements of @a v. 00084 void operator%=(const valarray<_Tp>&) const; 00085 /// Add corresponding elements of @a v to slice elements. 00086 void operator+=(const valarray<_Tp>&) const; 00087 /// Subtract corresponding elements of @a v from slice elements. 00088 void operator-=(const valarray<_Tp>&) const; 00089 /// Logical xor slice elements with corresponding elements of @a v. 00090 void operator^=(const valarray<_Tp>&) const; 00091 /// Logical and slice elements with corresponding elements of @a v. 00092 void operator&=(const valarray<_Tp>&) const; 00093 /// Logical or slice elements with corresponding elements of @a v. 00094 void operator|=(const valarray<_Tp>&) const; 00095 /// Left shift slice elements by corresponding elements of @a v. 00096 void operator<<=(const valarray<_Tp>&) const; 00097 /// Right shift slice elements by corresponding elements of @a v. 00098 void operator>>=(const valarray<_Tp>&) const; 00099 /// Assign all slice elements to @a t. 00100 void operator= (const _Tp&) const; 00101 // ~indirect_array(); 00102 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 template<class _Dom> 00124 void operator>>=(const _Expr<_Dom, _Tp>&) const; 00125 00126 private: 00127 /// Copy constructor. Both slices refer to the same underlying array. 00128 indirect_array(_Array<_Tp>, size_t, _Array<size_t>); 00129 00130 friend class valarray<_Tp>; 00131 friend class gslice_array<_Tp>; 00132 00133 const size_t _M_sz; 00134 const _Array<size_t> _M_index; 00135 const _Array<_Tp> _M_array; 00136 00137 // not implemented 00138 indirect_array(); 00139 }; 00140 00141 template<typename _Tp> 00142 inline 00143 indirect_array<_Tp>::indirect_array(const indirect_array<_Tp>& __a) 00144 : _M_sz(__a._M_sz), _M_index(__a._M_index), _M_array(__a._M_array) {} 00145 00146 template<typename _Tp> 00147 inline 00148 indirect_array<_Tp>::indirect_array(_Array<_Tp> __a, size_t __s, 00149 _Array<size_t> __i) 00150 : _M_sz(__s), _M_index(__i), _M_array(__a) {} 00151 00152 template<typename _Tp> 00153 inline indirect_array<_Tp>& 00154 indirect_array<_Tp>::operator=(const indirect_array<_Tp>& __a) 00155 { 00156 std::__valarray_copy(__a._M_array, _M_sz, __a._M_index, _M_array, 00157 _M_index); 00158 return *this; 00159 } 00160 00161 template<typename _Tp> 00162 inline void 00163 indirect_array<_Tp>::operator=(const _Tp& __t) const 00164 { std::__valarray_fill(_M_array, _M_index, _M_sz, __t); } 00165 00166 template<typename _Tp> 00167 inline void 00168 indirect_array<_Tp>::operator=(const valarray<_Tp>& __v) const 00169 { std::__valarray_copy(_Array<_Tp>(__v), _M_sz, _M_array, _M_index); } 00170 00171 template<typename _Tp> 00172 template<class _Dom> 00173 inline void 00174 indirect_array<_Tp>::operator=(const _Expr<_Dom, _Tp>& __e) const 00175 { std::__valarray_copy(__e, _M_sz, _M_array, _M_index); } 00176 00177 #undef _DEFINE_VALARRAY_OPERATOR 00178 #define _DEFINE_VALARRAY_OPERATOR(_Op, _Name) \ 00179 template<typename _Tp> \ 00180 inline void \ 00181 indirect_array<_Tp>::operator _Op##=(const valarray<_Tp>& __v) const\ 00182 { \ 00183 _Array_augmented_##_Name(_M_array, _M_index, _Array<_Tp>(__v), _M_sz); \ 00184 } \ 00185 \ 00186 template<typename _Tp> \ 00187 template<class _Dom> \ 00188 inline void \ 00189 indirect_array<_Tp>::operator _Op##=(const _Expr<_Dom,_Tp>& __e) const\ 00190 { \ 00191 _Array_augmented_##_Name(_M_array, _M_index, __e, _M_sz); \ 00192 } 00193 00194 _DEFINE_VALARRAY_OPERATOR(*, __multiplies) 00195 _DEFINE_VALARRAY_OPERATOR(/, __divides) 00196 _DEFINE_VALARRAY_OPERATOR(%, __modulus) 00197 _DEFINE_VALARRAY_OPERATOR(+, __plus) 00198 _DEFINE_VALARRAY_OPERATOR(-, __minus) 00199 _DEFINE_VALARRAY_OPERATOR(^, __bitwise_xor) 00200 _DEFINE_VALARRAY_OPERATOR(&, __bitwise_and) 00201 _DEFINE_VALARRAY_OPERATOR(|, __bitwise_or) 00202 _DEFINE_VALARRAY_OPERATOR(<<, __shift_left) 00203 _DEFINE_VALARRAY_OPERATOR(>>, __shift_right) 00204 00205 #undef _DEFINE_VALARRAY_OPERATOR 00206 00207 // @} group numeric_arrays 00208 00209 _GLIBCXX_END_NAMESPACE_VERSION 00210 } // namespace 00211 00212 #endif /* _INDIRECT_ARRAY_H */