libstdc++
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00001 // The template and inlines for the -*- C++ -*- indirect_array class. 00002 00003 // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 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/indirect_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 _INDIRECT_ARRAY_H 00034 #define _INDIRECT_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 arbitrary subset of an array. 00049 * 00050 * An indirect_array is a reference to the actual elements of an array 00051 * specified by an ordered array of indices. The way to get an 00052 * indirect_array is to call operator[](valarray<size_t>) on a valarray. 00053 * The returned indirect_array then permits carrying operations out on the 00054 * referenced subset of elements in the original valarray. 00055 * 00056 * For example, if an indirect_array is obtained using the array (4,2,0) as 00057 * an argument, and then assigned to an array containing (1,2,3), then the 00058 * underlying array will have array[0]==3, array[2]==2, and array[4]==1. 00059 * 00060 * @param Tp Element type. 00061 */ 00062 template <class _Tp> 00063 class indirect_array 00064 { 00065 public: 00066 typedef _Tp value_type; 00067 00068 // _GLIBCXX_RESOLVE_LIB_DEFECTS 00069 // 253. valarray helper functions are almost entirely useless 00070 00071 /// Copy constructor. Both slices refer to the same underlying array. 00072 indirect_array(const indirect_array&); 00073 00074 /// Assignment operator. Assigns elements to corresponding elements 00075 /// of @a a. 00076 indirect_array& operator=(const indirect_array&); 00077 00078 /// Assign slice elements to corresponding elements of @a v. 00079 void operator=(const valarray<_Tp>&) const; 00080 /// Multiply slice elements by corresponding elements of @a v. 00081 void operator*=(const valarray<_Tp>&) const; 00082 /// Divide slice elements by corresponding elements of @a v. 00083 void operator/=(const valarray<_Tp>&) const; 00084 /// Modulo slice elements by corresponding elements of @a v. 00085 void operator%=(const valarray<_Tp>&) const; 00086 /// Add corresponding elements of @a v to slice elements. 00087 void operator+=(const valarray<_Tp>&) const; 00088 /// Subtract corresponding elements of @a v from slice elements. 00089 void operator-=(const valarray<_Tp>&) const; 00090 /// Logical xor slice elements with corresponding elements of @a v. 00091 void operator^=(const valarray<_Tp>&) const; 00092 /// Logical and slice elements with corresponding elements of @a v. 00093 void operator&=(const valarray<_Tp>&) const; 00094 /// Logical or slice elements with corresponding elements of @a v. 00095 void operator|=(const valarray<_Tp>&) const; 00096 /// Left shift slice elements by corresponding elements of @a v. 00097 void operator<<=(const valarray<_Tp>&) const; 00098 /// Right shift slice elements by corresponding elements of @a v. 00099 void operator>>=(const valarray<_Tp>&) const; 00100 /// Assign all slice elements to @a t. 00101 void operator= (const _Tp&) const; 00102 // ~indirect_array(); 00103 00104 template<class _Dom> 00105 void operator=(const _Expr<_Dom, _Tp>&) const; 00106 template<class _Dom> 00107 void operator*=(const _Expr<_Dom, _Tp>&) const; 00108 template<class _Dom> 00109 void operator/=(const _Expr<_Dom, _Tp>&) const; 00110 template<class _Dom> 00111 void operator%=(const _Expr<_Dom, _Tp>&) const; 00112 template<class _Dom> 00113 void operator+=(const _Expr<_Dom, _Tp>&) const; 00114 template<class _Dom> 00115 void operator-=(const _Expr<_Dom, _Tp>&) const; 00116 template<class _Dom> 00117 void operator^=(const _Expr<_Dom, _Tp>&) const; 00118 template<class _Dom> 00119 void operator&=(const _Expr<_Dom, _Tp>&) const; 00120 template<class _Dom> 00121 void operator|=(const _Expr<_Dom, _Tp>&) const; 00122 template<class _Dom> 00123 void operator<<=(const _Expr<_Dom, _Tp>&) const; 00124 template<class _Dom> 00125 void operator>>=(const _Expr<_Dom, _Tp>&) const; 00126 00127 private: 00128 /// Copy constructor. Both slices refer to the same underlying array. 00129 indirect_array(_Array<_Tp>, size_t, _Array<size_t>); 00130 00131 friend class valarray<_Tp>; 00132 friend class gslice_array<_Tp>; 00133 00134 const size_t _M_sz; 00135 const _Array<size_t> _M_index; 00136 const _Array<_Tp> _M_array; 00137 00138 // not implemented 00139 indirect_array(); 00140 }; 00141 00142 template<typename _Tp> 00143 inline 00144 indirect_array<_Tp>::indirect_array(const indirect_array<_Tp>& __a) 00145 : _M_sz(__a._M_sz), _M_index(__a._M_index), _M_array(__a._M_array) {} 00146 00147 template<typename _Tp> 00148 inline 00149 indirect_array<_Tp>::indirect_array(_Array<_Tp> __a, size_t __s, 00150 _Array<size_t> __i) 00151 : _M_sz(__s), _M_index(__i), _M_array(__a) {} 00152 00153 template<typename _Tp> 00154 inline indirect_array<_Tp>& 00155 indirect_array<_Tp>::operator=(const indirect_array<_Tp>& __a) 00156 { 00157 std::__valarray_copy(__a._M_array, _M_sz, __a._M_index, _M_array, 00158 _M_index); 00159 return *this; 00160 } 00161 00162 template<typename _Tp> 00163 inline void 00164 indirect_array<_Tp>::operator=(const _Tp& __t) const 00165 { std::__valarray_fill(_M_array, _M_index, _M_sz, __t); } 00166 00167 template<typename _Tp> 00168 inline void 00169 indirect_array<_Tp>::operator=(const valarray<_Tp>& __v) const 00170 { std::__valarray_copy(_Array<_Tp>(__v), _M_sz, _M_array, _M_index); } 00171 00172 template<typename _Tp> 00173 template<class _Dom> 00174 inline void 00175 indirect_array<_Tp>::operator=(const _Expr<_Dom, _Tp>& __e) const 00176 { std::__valarray_copy(__e, _M_sz, _M_array, _M_index); } 00177 00178 #undef _DEFINE_VALARRAY_OPERATOR 00179 #define _DEFINE_VALARRAY_OPERATOR(_Op, _Name) \ 00180 template<typename _Tp> \ 00181 inline void \ 00182 indirect_array<_Tp>::operator _Op##=(const valarray<_Tp>& __v) const\ 00183 { \ 00184 _Array_augmented_##_Name(_M_array, _M_index, _Array<_Tp>(__v), _M_sz); \ 00185 } \ 00186 \ 00187 template<typename _Tp> \ 00188 template<class _Dom> \ 00189 inline void \ 00190 indirect_array<_Tp>::operator _Op##=(const _Expr<_Dom,_Tp>& __e) const\ 00191 { \ 00192 _Array_augmented_##_Name(_M_array, _M_index, __e, _M_sz); \ 00193 } 00194 00195 _DEFINE_VALARRAY_OPERATOR(*, __multiplies) 00196 _DEFINE_VALARRAY_OPERATOR(/, __divides) 00197 _DEFINE_VALARRAY_OPERATOR(%, __modulus) 00198 _DEFINE_VALARRAY_OPERATOR(+, __plus) 00199 _DEFINE_VALARRAY_OPERATOR(-, __minus) 00200 _DEFINE_VALARRAY_OPERATOR(^, __bitwise_xor) 00201 _DEFINE_VALARRAY_OPERATOR(&, __bitwise_and) 00202 _DEFINE_VALARRAY_OPERATOR(|, __bitwise_or) 00203 _DEFINE_VALARRAY_OPERATOR(<<, __shift_left) 00204 _DEFINE_VALARRAY_OPERATOR(>>, __shift_right) 00205 00206 #undef _DEFINE_VALARRAY_OPERATOR 00207 00208 // @} group numeric_arrays 00209 00210 _GLIBCXX_END_NAMESPACE_VERSION 00211 } // namespace 00212 00213 #endif /* _INDIRECT_ARRAY_H */