libstdc++
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00001 // The template and inlines for the -*- C++ -*- mask_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/mask_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 _MASK_ARRAY_H 00034 #define _MASK_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 selected subset of an array. 00049 * 00050 * A mask_array is a reference to the actual elements of an array specified 00051 * by a bitmask in the form of an array of bool. The way to get a 00052 * mask_array is to call operator[](valarray<bool>) on a valarray. The 00053 * returned mask_array then permits carrying operations out on the 00054 * referenced subset of elements in the original valarray. 00055 * 00056 * For example, if a mask_array is obtained using the array (false, true, 00057 * false, true) as an argument, the mask array has two elements referring 00058 * to array[1] and array[3] in the underlying array. 00059 * 00060 * @param Tp Element type. 00061 */ 00062 template <class _Tp> 00063 class mask_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 mask_array (const mask_array&); 00073 00074 /// Assignment operator. Assigns elements to corresponding elements 00075 /// of @a a. 00076 mask_array& operator=(const mask_array&); 00077 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 00102 // ~mask_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 mask_array(_Array<_Tp>, size_t, _Array<bool>); 00129 friend class valarray<_Tp>; 00130 00131 const size_t _M_sz; 00132 const _Array<bool> _M_mask; 00133 const _Array<_Tp> _M_array; 00134 00135 // not implemented 00136 mask_array(); 00137 }; 00138 00139 template<typename _Tp> 00140 inline mask_array<_Tp>::mask_array(const mask_array<_Tp>& a) 00141 : _M_sz(a._M_sz), _M_mask(a._M_mask), _M_array(a._M_array) {} 00142 00143 template<typename _Tp> 00144 inline 00145 mask_array<_Tp>::mask_array(_Array<_Tp> __a, size_t __s, _Array<bool> __m) 00146 : _M_sz(__s), _M_mask(__m), _M_array(__a) {} 00147 00148 template<typename _Tp> 00149 inline mask_array<_Tp>& 00150 mask_array<_Tp>::operator=(const mask_array<_Tp>& __a) 00151 { 00152 std::__valarray_copy(__a._M_array, __a._M_mask, 00153 _M_sz, _M_array, _M_mask); 00154 return *this; 00155 } 00156 00157 template<typename _Tp> 00158 inline void 00159 mask_array<_Tp>::operator=(const _Tp& __t) const 00160 { std::__valarray_fill(_M_array, _M_sz, _M_mask, __t); } 00161 00162 template<typename _Tp> 00163 inline void 00164 mask_array<_Tp>::operator=(const valarray<_Tp>& __v) const 00165 { std::__valarray_copy(_Array<_Tp>(__v), __v.size(), _M_array, _M_mask); } 00166 00167 template<typename _Tp> 00168 template<class _Ex> 00169 inline void 00170 mask_array<_Tp>::operator=(const _Expr<_Ex, _Tp>& __e) const 00171 { std::__valarray_copy(__e, __e.size(), _M_array, _M_mask); } 00172 00173 #undef _DEFINE_VALARRAY_OPERATOR 00174 #define _DEFINE_VALARRAY_OPERATOR(_Op, _Name) \ 00175 template<typename _Tp> \ 00176 inline void \ 00177 mask_array<_Tp>::operator _Op##=(const valarray<_Tp>& __v) const \ 00178 { \ 00179 _Array_augmented_##_Name(_M_array, _M_mask, \ 00180 _Array<_Tp>(__v), __v.size()); \ 00181 } \ 00182 \ 00183 template<typename _Tp> \ 00184 template<class _Dom> \ 00185 inline void \ 00186 mask_array<_Tp>::operator _Op##=(const _Expr<_Dom, _Tp>& __e) const\ 00187 { \ 00188 _Array_augmented_##_Name(_M_array, _M_mask, __e, __e.size()); \ 00189 } 00190 00191 _DEFINE_VALARRAY_OPERATOR(*, __multiplies) 00192 _DEFINE_VALARRAY_OPERATOR(/, __divides) 00193 _DEFINE_VALARRAY_OPERATOR(%, __modulus) 00194 _DEFINE_VALARRAY_OPERATOR(+, __plus) 00195 _DEFINE_VALARRAY_OPERATOR(-, __minus) 00196 _DEFINE_VALARRAY_OPERATOR(^, __bitwise_xor) 00197 _DEFINE_VALARRAY_OPERATOR(&, __bitwise_and) 00198 _DEFINE_VALARRAY_OPERATOR(|, __bitwise_or) 00199 _DEFINE_VALARRAY_OPERATOR(<<, __shift_left) 00200 _DEFINE_VALARRAY_OPERATOR(>>, __shift_right) 00201 00202 #undef _DEFINE_VALARRAY_OPERATOR 00203 00204 // @} group numeric_arrays 00205 00206 _GLIBCXX_END_NAMESPACE_VERSION 00207 } // namespace 00208 00209 #endif /* _MASK_ARRAY_H */