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toolchain-gcc-arm-embedded/arm-none-eabi/include/c++/10.2.1/bits/indirect_array.h

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  1. // The template and inlines for the -*- C++ -*- indirect_array class.

  2. 

  3. // Copyright (C) 1997-2020 Free Software Foundation, Inc.

  4. //

  5. // This file is part of the GNU ISO C++ Library.  This library is free

  6. // software; you can redistribute it and/or modify it under the

  7. // terms of the GNU General Public License as published by the

  8. // Free Software Foundation; either version 3, or (at your option)

  9. // any later version.

  10. 

  11. // This library is distributed in the hope that it will be useful,

  12. // but WITHOUT ANY WARRANTY; without even the implied warranty of

  13. // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

  14. // GNU General Public License for more details.

  15. 

  16. // Under Section 7 of GPL version 3, you are granted additional

  17. // permissions described in the GCC Runtime Library Exception, version

  18. // 3.1, as published by the Free Software Foundation.

  19. 

  20. // You should have received a copy of the GNU General Public License and

  21. // a copy of the GCC Runtime Library Exception along with this program;

  22. // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see

  23. // <http://www.gnu.org/licenses/>.

  24. 

  25. /** @file bits/indirect_array.h

  26.  *  This is an internal header file, included by other library headers.

  27.  *  Do not attempt to use it directly. @headername{valarray}

  28.  */

  29. 

  30. // Written by Gabriel Dos Reis <Gabriel.Dos-Reis@DPTMaths.ENS-Cachan.Fr>

  31. 

  32. #ifndef _INDIRECT_ARRAY_H

  33. #define _INDIRECT_ARRAY_H 1

  34. 

  35. #pragma GCC system_header

  36. 

  37. namespace std _GLIBCXX_VISIBILITY(default)

  38. {

  39. _GLIBCXX_BEGIN_NAMESPACE_VERSION

  40. 

  41.   /**

  42.    * @addtogroup numeric_arrays

  43.    * @{

  44.    */

  45. 

  46.   /**

  47.    *  @brief  Reference to arbitrary subset of an array.

  48.    *

  49.    *  An indirect_array is a reference to the actual elements of an array

  50.    *  specified by an ordered array of indices.  The way to get an

  51.    *  indirect_array is to call operator[](valarray<size_t>) on a valarray.

  52.    *  The returned indirect_array then permits carrying operations out on the

  53.    *  referenced subset of elements in the original valarray.

  54.    *

  55.    *  For example, if an indirect_array is obtained using the array (4,2,0) as

  56.    *  an argument, and then assigned to an array containing (1,2,3), then the

  57.    *  underlying array will have array[0]==3, array[2]==2, and array[4]==1.

  58.    *

  59.    *  @param  Tp  Element type.

  60.    */

  61.   template <class _Tp>

  62.     class indirect_array

  63.     {

  64.     public:

  65.       typedef _Tp value_type;

  66. 

  67.       // _GLIBCXX_RESOLVE_LIB_DEFECTS

  68.       // 253. valarray helper functions are almost entirely useless

  69. 

  70.       ///  Copy constructor.  Both slices refer to the same underlying array.

  71.       indirect_array(const indirect_array&);

  72. 

  73.       ///  Assignment operator.  Assigns elements to corresponding elements

  74.       ///  of @a a.

  75.       indirect_array& operator=(const indirect_array&);

  76. 

  77.       ///  Assign slice elements to corresponding elements of @a v.

  78.       void operator=(const valarray<_Tp>&) const;

  79.       ///  Multiply slice elements by corresponding elements of @a v.

  80.       void operator*=(const valarray<_Tp>&) const;

  81.       ///  Divide slice elements by corresponding elements of @a v.

  82.       void operator/=(const valarray<_Tp>&) const;

  83.       ///  Modulo slice elements by corresponding elements of @a v.

  84.       void operator%=(const valarray<_Tp>&) const;

  85.       ///  Add corresponding elements of @a v to slice elements.

  86.       void operator+=(const valarray<_Tp>&) const;

  87.       ///  Subtract corresponding elements of @a v from slice elements.

  88.       void operator-=(const valarray<_Tp>&) const;

  89.       ///  Logical xor slice elements with corresponding elements of @a v.

  90.       void operator^=(const valarray<_Tp>&) const;

  91.       ///  Logical and slice elements with corresponding elements of @a v.

  92.       void operator&=(const valarray<_Tp>&) const;

  93.       ///  Logical or slice elements with corresponding elements of @a v.

  94.       void operator|=(const valarray<_Tp>&) const;

  95.       ///  Left shift slice elements by corresponding elements of @a v.

  96.       void operator<<=(const valarray<_Tp>&) const;

  97.       ///  Right shift slice elements by corresponding elements of @a v.

  98.       void operator>>=(const valarray<_Tp>&) const;

  99.       ///  Assign all slice elements to @a t.

  100.       void operator= (const _Tp&) const;

  101.       //    ~indirect_array();

  102. 

  103.       template<class _Dom>

  104.       void operator=(const _Expr<_Dom, _Tp>&) const;

  105.       template<class _Dom>

  106.       void operator*=(const _Expr<_Dom, _Tp>&) const;

  107.       template<class _Dom>

  108.       void operator/=(const _Expr<_Dom, _Tp>&) const;

  109.       template<class _Dom>

  110.       void operator%=(const _Expr<_Dom, _Tp>&) const;

  111.       template<class _Dom>

  112.       void operator+=(const _Expr<_Dom, _Tp>&) const;

  113.       template<class _Dom>

  114.       void operator-=(const _Expr<_Dom, _Tp>&) const;

  115.       template<class _Dom>

  116.       void operator^=(const _Expr<_Dom, _Tp>&) const;

  117.       template<class _Dom>

  118.       void operator&=(const _Expr<_Dom, _Tp>&) const;

  119.       template<class _Dom>

  120.       void operator|=(const _Expr<_Dom, _Tp>&) const;

  121.       template<class _Dom>

  122.       void operator<<=(const _Expr<_Dom, _Tp>&) const;

  123.       template<class _Dom>

  124.       void operator>>=(const _Expr<_Dom, _Tp>&) const;

  125. 

  126.     private:

  127.       ///  Copy constructor.  Both slices refer to the same underlying array.

  128.       indirect_array(_Array<_Tp>, size_t, _Array<size_t>);

  129. 

  130.       friend class valarray<_Tp>;

  131.       friend class gslice_array<_Tp>;

  132. 

  133.       const size_t	 _M_sz;

  134.       const _Array<size_t> _M_index;

  135.       const _Array<_Tp>	 _M_array;

  136. 

  137.       // not implemented

  138.       indirect_array();

  139.     };

  140. 

  141.   template<typename _Tp>

  142.     inline

  143.     indirect_array<_Tp>::indirect_array(const indirect_array<_Tp>& __a)

  144.     : _M_sz(__a._M_sz), _M_index(__a._M_index), _M_array(__a._M_array) {}

  145. 

  146.   template<typename _Tp>

  147.     inline

  148.     indirect_array<_Tp>::indirect_array(_Array<_Tp> __a, size_t __s,

  149. 					_Array<size_t> __i)

  150.     : _M_sz(__s), _M_index(__i), _M_array(__a) {}

  151. 

  152.   template<typename _Tp>

  153.     inline indirect_array<_Tp>&

  154.     indirect_array<_Tp>::operator=(const indirect_array<_Tp>& __a)

  155.     {

  156.       std::__valarray_copy(__a._M_array, _M_sz, __a._M_index, _M_array,

  157. 			   _M_index);

  158.       return *this;

  159.     }

  160. 

  161.   template<typename _Tp>

  162.     inline void

  163.     indirect_array<_Tp>::operator=(const _Tp& __t) const

  164.     { std::__valarray_fill(_M_array, _M_index, _M_sz, __t); }

  165. 

  166.   template<typename _Tp>

  167.     inline void

  168.     indirect_array<_Tp>::operator=(const valarray<_Tp>& __v) const

  169.     { std::__valarray_copy(_Array<_Tp>(__v), _M_sz, _M_array, _M_index); }

  170. 

  171.   template<typename _Tp>

  172.     template<class _Dom>

  173.       inline void

  174.       indirect_array<_Tp>::operator=(const _Expr<_Dom, _Tp>& __e) const

  175.       { std::__valarray_copy(__e, _M_sz, _M_array, _M_index); }

  176. 

  177. #undef _DEFINE_VALARRAY_OPERATOR

  178. #define _DEFINE_VALARRAY_OPERATOR(_Op, _Name)				\

  179.   template<typename _Tp>						\

  180.     inline void								\

  181.     indirect_array<_Tp>::operator _Op##=(const valarray<_Tp>& __v) const\

  182.     {									\

  183.       _Array_augmented_##_Name(_M_array, _M_index, _Array<_Tp>(__v), _M_sz); \

  184.     }									\

  185. 									\

  186.   template<typename _Tp>                                                \

  187.     template<class _Dom>				                \

  188.       inline void							\

  189.       indirect_array<_Tp>::operator _Op##=(const _Expr<_Dom,_Tp>& __e) const\

  190.       {									\

  191. 	_Array_augmented_##_Name(_M_array, _M_index, __e, _M_sz);	\

  192.       }

  193. 

  194. _DEFINE_VALARRAY_OPERATOR(*, __multiplies)

  195. _DEFINE_VALARRAY_OPERATOR(/, __divides)

  196. _DEFINE_VALARRAY_OPERATOR(%, __modulus)

  197. _DEFINE_VALARRAY_OPERATOR(+, __plus)

  198. _DEFINE_VALARRAY_OPERATOR(-, __minus)

  199. _DEFINE_VALARRAY_OPERATOR(^, __bitwise_xor)

  200. _DEFINE_VALARRAY_OPERATOR(&, __bitwise_and)

  201. _DEFINE_VALARRAY_OPERATOR(|, __bitwise_or)

  202. _DEFINE_VALARRAY_OPERATOR(<<, __shift_left)

  203. _DEFINE_VALARRAY_OPERATOR(>>, __shift_right)

  204. 

  205. #undef _DEFINE_VALARRAY_OPERATOR

  206. 

  207.   // @} group numeric_arrays

  208. 

  209. _GLIBCXX_END_NAMESPACE_VERSION

  210. } // namespace

  211. 

  212. #endif /* _INDIRECT_ARRAY_H */