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

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  1. // The template and inlines for the -*- C++ -*- mask_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/mask_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 _MASK_ARRAY_H

  33. #define _MASK_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 selected subset of an array.

  48.    *

  49.    *  A mask_array is a reference to the actual elements of an array specified

  50.    *  by a bitmask in the form of an array of bool.  The way to get a

  51.    *  mask_array is to call operator[](valarray<bool>) on a valarray.  The

  52.    *  returned mask_array then permits carrying operations out on the

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

  54.    *

  55.    *  For example, if a mask_array is obtained using the array (false, true,

  56.    *  false, true) as an argument, the mask array has two elements referring

  57.    *  to array[1] and array[3] in the underlying array.

  58.    *

  59.    *  @param  Tp  Element type.

  60.    */

  61.   template <class _Tp>

  62.     class mask_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.       mask_array (const mask_array&);

  72.       

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

  74.       ///  of @a a.

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

  76. 

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  100. 

  101.         //        ~mask_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.       mask_array(_Array<_Tp>, size_t, _Array<bool>);

  128.       friend class valarray<_Tp>;

  129. 

  130.       const size_t       _M_sz;

  131.       const _Array<bool> _M_mask;

  132.       const _Array<_Tp>  _M_array;

  133. 

  134. #if __cplusplus < 201103L

  135.       // not implemented

  136.       mask_array();

  137. #else

  138.     public:

  139.       mask_array() = delete;

  140. #endif

  141.     };

  142. 

  143.   template<typename _Tp>

  144.     inline mask_array<_Tp>::mask_array(const mask_array<_Tp>& __a)

  145.     : _M_sz(__a._M_sz), _M_mask(__a._M_mask), _M_array(__a._M_array) {}

  146. 

  147.   template<typename _Tp>

  148.     inline

  149.     mask_array<_Tp>::mask_array(_Array<_Tp> __a, size_t __s, _Array<bool> __m)

  150.     : _M_sz(__s), _M_mask(__m), _M_array(__a) {}

  151. 

  152.   template<typename _Tp>

  153.     inline mask_array<_Tp>&

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

  155.     {

  156.       std::__valarray_copy(__a._M_array, __a._M_mask,

  157. 			   _M_sz, _M_array, _M_mask);

  158.       return *this;

  159.     }

  160. 

  161.   template<typename _Tp>

  162.     inline void

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

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

  165. 

  166.   template<typename _Tp>

  167.     inline void

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

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

  170. 

  171.   template<typename _Tp>

  172.     template<class _Ex>

  173.       inline void

  174.       mask_array<_Tp>::operator=(const _Expr<_Ex, _Tp>& __e) const

  175.       { std::__valarray_copy(__e, __e.size(), _M_array, _M_mask); }

  176. 

  177. #undef _DEFINE_VALARRAY_OPERATOR

  178. #define _DEFINE_VALARRAY_OPERATOR(_Op, _Name)				\

  179.   template<typename _Tp>						\

  180.     inline void								\

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

  182.     {									\

  183.       _Array_augmented_##_Name(_M_array, _M_mask,			\

  184. 			       _Array<_Tp>(__v), __v.size());		\

  185.     }									\

  186. 									\

  187.   template<typename _Tp>                                                \

  188.     template<class _Dom>			                        \

  189.       inline void							\

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

  191.       {									\

  192. 	_Array_augmented_##_Name(_M_array, _M_mask, __e, __e.size());   \

  193.       }

  194. 

  195. _DEFINE_VALARRAY_OPERATOR(*, __multiplies)

  196. _DEFINE_VALARRAY_OPERATOR(/, __divides)

  197. _DEFINE_VALARRAY_OPERATOR(%, __modulus)

  198. _DEFINE_VALARRAY_OPERATOR(+, __plus)

  199. _DEFINE_VALARRAY_OPERATOR(-, __minus)

  200. _DEFINE_VALARRAY_OPERATOR(^, __bitwise_xor)

  201. _DEFINE_VALARRAY_OPERATOR(&, __bitwise_and)

  202. _DEFINE_VALARRAY_OPERATOR(|, __bitwise_or)

  203. _DEFINE_VALARRAY_OPERATOR(<<, __shift_left)

  204. _DEFINE_VALARRAY_OPERATOR(>>, __shift_right)

  205. 

  206. #undef _DEFINE_VALARRAY_OPERATOR

  207. 

  208.   // @} group numeric_arrays

  209. 

  210. _GLIBCXX_END_NAMESPACE_VERSION

  211. } // namespace

  212. 

  213. #endif /* _MASK_ARRAY_H */