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Edit File : slice_array.h \| Size : 9.13 KB
// The template and inlines for the -- C++ -- slice_array class. // Copyright (C) 1997-2018 Free Software Foundation, Inc. // // This file is part of the GNU ISO C++ Library. This library is free // software; you can redistribute it and/or modify it under the // terms of the GNU General Public License as published by the // Free Software Foundation; either version 3, or (at your option) // any later version. // This library is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // Under Section 7 of GPL version 3, you are granted additional // permissions described in the GCC Runtime Library Exception, version // 3.1, as published by the Free Software Foundation. // You should have received a copy of the GNU General Public License and // a copy of the GCC Runtime Library Exception along with this program; // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see // <http://www.gnu.org/licenses/>. /** @file bits/slice_array.h * This is an internal header file, included by other library headers. * Do not attempt to use it directly. @headername{valarray} / // Written by Gabriel Dos Reis <Gabriel.Dos-Reis@DPTMaths.ENS-Cachan.Fr> #ifndef _SLICE_ARRAY_H #define _SLICE_ARRAY_H 1 #pragma GCC system_header namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION /* * @addtogroup numeric_arrays * @{ / /* * @brief Class defining one-dimensional subset of an array. * * The slice class represents a one-dimensional subset of an array, * specified by three parameters: start offset, size, and stride. The * start offset is the index of the first element of the array that is part * of the subset. The size is the total number of elements in the subset. * Stride is the distance between each successive array element to include * in the subset. * * For example, with an array of size 10, and a slice with offset 1, size 3 * and stride 2, the subset consists of array elements 1, 3, and 5. / class slice { public: /// Construct an empty slice. slice(); /* * @brief Construct a slice. * * @param __o Offset in array of first element. * @param __d Number of elements in slice. * @param __s Stride between array elements. / slice(size_t __o, size_t __d, size_t __s); /// Return array offset of first slice element. size_t start() const; /// Return size of slice. size_t size() const; /// Return array stride of slice. size_t stride() const; private: size_t _M_off; // offset size_t _M_sz; // size size_t _M_st; // stride unit }; // _GLIBCXX_RESOLVE_LIB_DEFECTS // 543. valarray slice default constructor inline slice::slice() : _M_off(0), _M_sz(0), _M_st(0) {} inline slice::slice(size_t __o, size_t __d, size_t __s) : _M_off(__o), _M_sz(__d), _M_st(__s) {} inline size_t slice::start() const { return _M_off; } inline size_t slice::size() const { return _M_sz; } inline size_t slice::stride() const { return _M_st; } /* * @brief Reference to one-dimensional subset of an array. * * A slice_array is a reference to the actual elements of an array * specified by a slice. The way to get a slice_array is to call * operator[](slice) on a valarray. The returned slice_array then permits * carrying operations out on the referenced subset of elements in the * original valarray. For example, operator+=(valarray) will add values * to the subset of elements in the underlying valarray this slice_array * refers to. * * @param Tp Element type. / template<typename _Tp> class slice_array { public: typedef _Tp value_type; // _GLIBCXX_RESOLVE_LIB_DEFECTS // 253. valarray helper functions are almost entirely useless /// Copy constructor. Both slices refer to the same underlying array. slice_array(const slice_array&); /// Assignment operator. Assigns slice elements to corresponding /// elements of @a a. slice_array& operator=(const slice_array&); /// Assign slice elements to corresponding elements of @a v. void operator=(const valarray<_Tp>&) const; /// Multiply slice elements by corresponding elements of @a v. void operator=(const valarray<_Tp>&) const; /// Divide slice elements by corresponding elements of @a v. void operator/=(const valarray<_Tp>&) const; /// Modulo slice elements by corresponding elements of @a v. void operator%=(const valarray<_Tp>&) const; /// Add corresponding elements of @a v to slice elements. void operator+=(const valarray<_Tp>&) const; /// Subtract corresponding elements of @a v from slice elements. void operator-=(const valarray<_Tp>&) const; /// Logical xor slice elements with corresponding elements of @a v. void operator^=(const valarray<_Tp>&) const; /// Logical and slice elements with corresponding elements of @a v. void operator&=(const valarray<_Tp>&) const; /// Logical or slice elements with corresponding elements of @a v. void operator\|=(const valarray<_Tp>&) const; /// Left shift slice elements by corresponding elements of @a v. void operator<<=(const valarray<_Tp>&) const; /// Right shift slice elements by corresponding elements of @a v. void operator>>=(const valarray<_Tp>&) const; /// Assign all slice elements to @a t. void operator=(const _Tp &) const; // ~slice_array (); template<class _Dom> void operator=(const _Expr<_Dom, _Tp>&) const; template<class _Dom> void operator=(const _Expr<_Dom, _Tp>&) const; template<class _Dom> void operator/=(const _Expr<_Dom, _Tp>&) const; template<class _Dom> void operator%=(const _Expr<_Dom, _Tp>&) const; template<class _Dom> void operator+=(const _Expr<_Dom, _Tp>&) const; template<class _Dom> void operator-=(const _Expr<_Dom, _Tp>&) const; template<class _Dom> void operator^=(const _Expr<_Dom, _Tp>&) const; template<class _Dom> void operator&=(const _Expr<_Dom, _Tp>&) const; template<class _Dom> void operator\|=(const _Expr<_Dom, _Tp>&) const; template<class _Dom> void operator<<=(const _Expr<_Dom, _Tp>&) const; template<class _Dom> void operator>>=(const _Expr<_Dom, _Tp>&) const; private: friend class valarray<_Tp>; slice_array(_Array<_Tp>, const slice&); const size_t _M_sz; const size_t _M_stride; const _Array<_Tp> _M_array; // not implemented slice_array(); }; template<typename _Tp> inline slice_array<_Tp>::slice_array(_Array<_Tp> __a, const slice& __s) : _M_sz(__s.size()), _M_stride(__s.stride()), _M_array(__a.begin() + __s.start()) {} template<typename _Tp> inline slice_array<_Tp>::slice_array(const slice_array<_Tp>& __a) : _M_sz(__a._M_sz), _M_stride(__a._M_stride), _M_array(__a._M_array) {} // template<typename _Tp> // inline slice_array<_Tp>::~slice_array () {} template<typename _Tp> inline slice_array<_Tp>& slice_array<_Tp>::operator=(const slice_array<_Tp>& __a) { std::__valarray_copy(__a._M_array, __a._M_sz, __a._M_stride, _M_array, _M_stride); return this; } template<typename _Tp> inline void slice_array<_Tp>::operator=(const _Tp& __t) const { std::__valarray_fill(_M_array, _M_sz, _M_stride, __t); } template<typename _Tp> inline void slice_array<_Tp>::operator=(const valarray<_Tp>& __v) const { std::__valarray_copy(_Array<_Tp>(__v), _M_array, _M_sz, _M_stride); } template<typename _Tp> template<class _Dom> inline void slice_array<_Tp>::operator=(const _Expr<_Dom,_Tp>& __e) const { std::__valarray_copy(__e, _M_sz, _M_array, _M_stride); } #undef _DEFINE_VALARRAY_OPERATOR #define _DEFINE_VALARRAY_OPERATOR(_Op,_Name) \ template<typename _Tp> \ inline void \ slice_array<_Tp>::operator _Op##=(const valarray<_Tp>& __v) const \ { \ _Array_augmented_##_Name(_M_array, _M_sz, _M_stride, _Array<_Tp>(__v));\ } \ \ template<typename _Tp> \ template<class _Dom> \ inline void \ slice_array<_Tp>::operator _Op##=(const _Expr<_Dom,_Tp>& __e) const\ { \ _Array_augmented_##_Name(_M_array, _M_stride, __e, _M_sz); \ } _DEFINE_VALARRAY_OPERATOR(, __multiplies) _DEFINE_VALARRAY_OPERATOR(/, __divides) _DEFINE_VALARRAY_OPERATOR(%, __modulus) _DEFINE_VALARRAY_OPERATOR(+, __plus) _DEFINE_VALARRAY_OPERATOR(-, __minus) _DEFINE_VALARRAY_OPERATOR(^, __bitwise_xor) _DEFINE_VALARRAY_OPERATOR(&, __bitwise_and) _DEFINE_VALARRAY_OPERATOR(\|, __bitwise_or) _DEFINE_VALARRAY_OPERATOR(<<, __shift_left) _DEFINE_VALARRAY_OPERATOR(>>, __shift_right) #undef _DEFINE_VALARRAY_OPERATOR // @} group numeric_arrays _GLIBCXX_END_NAMESPACE_VERSION } // namespace #endif / _SLICE_ARRAY_H */ Back

Edit File : slice_array.h | Size : 9.13 KB

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

// Copyright (C) 1997-2018 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
// <http://www.gnu.org/licenses/>.

/** @file bits/slice_array.h
 *  This is an internal header file, included by other library headers.
 *  Do not attempt to use it directly. @headername{valarray}
 */

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

#ifndef _SLICE_ARRAY_H
#define _SLICE_ARRAY_H 1

#pragma GCC system_header

namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

/**
   * @addtogroup numeric_arrays
   * @{
   */

/**
   *  @brief  Class defining one-dimensional subset of an array.
   *
   *  The slice class represents a one-dimensional subset of an array,
   *  specified by three parameters: start offset, size, and stride.  The
   *  start offset is the index of the first element of the array that is part
   *  of the subset.  The size is the total number of elements in the subset.
   *  Stride is the distance between each successive array element to include
   *  in the subset.
   *
   *  For example, with an array of size 10, and a slice with offset 1, size 3
   *  and stride 2, the subset consists of array elements 1, 3, and 5.
   */
  class slice
  {
  public:
    ///  Construct an empty slice.
    slice();

/**
     *  @brief  Construct a slice.
     *
     *  @param  __o  Offset in array of first element.
     *  @param  __d  Number of elements in slice.
     *  @param  __s  Stride between array elements.
     */
    slice(size_t __o, size_t __d, size_t __s);

///  Return array offset of first slice element.
    size_t start() const;
    ///  Return size of slice.
    size_t size() const;
    ///  Return array stride of slice.
    size_t stride() const;

private:
    size_t _M_off;                      // offset
    size_t _M_sz;			// size
    size_t _M_st;			// stride unit
  };

// _GLIBCXX_RESOLVE_LIB_DEFECTS
  // 543. valarray slice default constructor
  inline
  slice::slice() 
  : _M_off(0), _M_sz(0), _M_st(0) {}

inline
  slice::slice(size_t __o, size_t __d, size_t __s)
  : _M_off(__o), _M_sz(__d), _M_st(__s) {}

inline size_t
  slice::start() const
  { return _M_off; }

inline size_t
  slice::size() const
  { return _M_sz; }

inline size_t
  slice::stride() const
  { return _M_st; }

/**
   *  @brief  Reference to one-dimensional subset of an array.
   *
   *  A slice_array is a reference to the actual elements of an array
   *  specified by a slice.  The way to get a slice_array is to call
   *  operator[](slice) on a valarray.  The returned slice_array then permits
   *  carrying operations out on the referenced subset of elements in the
   *  original valarray.  For example, operator+=(valarray) will add values
   *  to the subset of elements in the underlying valarray this slice_array
   *  refers to.
   *
   *  @param  Tp  Element type.
   */
  template<typename _Tp>
    class slice_array
    {
    public:
      typedef _Tp value_type;

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

///  Copy constructor.  Both slices refer to the same underlying array.
      slice_array(const slice_array&);

///  Assignment operator.  Assigns slice elements to corresponding
      ///  elements of @a a.
      slice_array& operator=(const slice_array&);

///  Assign slice elements to corresponding elements of @a v.
      void operator=(const valarray<_Tp>&) const;
      ///  Multiply slice elements by corresponding elements of @a v.
      void operator*=(const valarray<_Tp>&) const;
      ///  Divide slice elements by corresponding elements of @a v.
      void operator/=(const valarray<_Tp>&) const;
      ///  Modulo slice elements by corresponding elements of @a v.
      void operator%=(const valarray<_Tp>&) const;
      ///  Add corresponding elements of @a v to slice elements.
      void operator+=(const valarray<_Tp>&) const;
      ///  Subtract corresponding elements of @a v from slice elements.
      void operator-=(const valarray<_Tp>&) const;
      ///  Logical xor slice elements with corresponding elements of @a v.
      void operator^=(const valarray<_Tp>&) const;
      ///  Logical and slice elements with corresponding elements of @a v.
      void operator&=(const valarray<_Tp>&) const;
      ///  Logical or slice elements with corresponding elements of @a v.
      void operator|=(const valarray<_Tp>&) const;
      ///  Left shift slice elements by corresponding elements of @a v.
      void operator<<=(const valarray<_Tp>&) const;
      ///  Right shift slice elements by corresponding elements of @a v.
      void operator>>=(const valarray<_Tp>&) const;
      ///  Assign all slice elements to @a t.
      void operator=(const _Tp &) const;
      //        ~slice_array ();

template<class _Dom>
        void operator=(const _Expr<_Dom, _Tp>&) const;
      template<class _Dom>
	void operator*=(const _Expr<_Dom, _Tp>&) const;
      template<class _Dom>
	void operator/=(const _Expr<_Dom, _Tp>&) const;
      template<class _Dom>
	void operator%=(const _Expr<_Dom, _Tp>&) const;
      template<class _Dom>
	void operator+=(const _Expr<_Dom, _Tp>&) const;
      template<class _Dom>
	void operator-=(const _Expr<_Dom, _Tp>&) const;
      template<class _Dom>
	void operator^=(const _Expr<_Dom, _Tp>&) const;
      template<class _Dom>
	void operator&=(const _Expr<_Dom, _Tp>&) const;
      template<class _Dom>
	void operator|=(const _Expr<_Dom, _Tp>&) const;
      template<class _Dom>
	void operator<<=(const _Expr<_Dom, _Tp>&) const;
      template<class _Dom>
	void operator>>=(const _Expr<_Dom, _Tp>&) const;

private:
      friend class valarray<_Tp>;
      slice_array(_Array<_Tp>, const slice&);

const size_t      _M_sz;
      const size_t      _M_stride;
      const _Array<_Tp> _M_array;

// not implemented
      slice_array();
    };

template<typename _Tp>
    inline
    slice_array<_Tp>::slice_array(_Array<_Tp> __a, const slice& __s)
    : _M_sz(__s.size()), _M_stride(__s.stride()),
      _M_array(__a.begin() + __s.start()) {}

template<typename _Tp>
    inline
    slice_array<_Tp>::slice_array(const slice_array<_Tp>& __a)
    : _M_sz(__a._M_sz), _M_stride(__a._M_stride), _M_array(__a._M_array) {}

//    template<typename _Tp>
  //    inline slice_array<_Tp>::~slice_array () {}

template<typename _Tp>
    inline slice_array<_Tp>&
    slice_array<_Tp>::operator=(const slice_array<_Tp>& __a)
    {
      std::__valarray_copy(__a._M_array, __a._M_sz, __a._M_stride,
			   _M_array, _M_stride);
      return *this;
    }

template<typename _Tp>
    inline void
    slice_array<_Tp>::operator=(const _Tp& __t) const
    { std::__valarray_fill(_M_array, _M_sz, _M_stride, __t); }

template<typename _Tp>
    inline void
    slice_array<_Tp>::operator=(const valarray<_Tp>& __v) const
    { std::__valarray_copy(_Array<_Tp>(__v), _M_array, _M_sz, _M_stride); }

template<typename _Tp>
  template<class _Dom>
    inline void
    slice_array<_Tp>::operator=(const _Expr<_Dom,_Tp>& __e) const
    { std::__valarray_copy(__e, _M_sz, _M_array, _M_stride); }

#undef _DEFINE_VALARRAY_OPERATOR
#define _DEFINE_VALARRAY_OPERATOR(_Op,_Name)				\
  template<typename _Tp>						\
    inline void								\
    slice_array<_Tp>::operator _Op##=(const valarray<_Tp>& __v) const	\
    {									\
      _Array_augmented_##_Name(_M_array, _M_sz, _M_stride, _Array<_Tp>(__v));\
    }									\
									\
  template<typename _Tp>                                                \
    template<class _Dom>				                \
      inline void							\
      slice_array<_Tp>::operator _Op##=(const _Expr<_Dom,_Tp>& __e) const\
      {									\
	  _Array_augmented_##_Name(_M_array, _M_stride, __e, _M_sz);	\
      }

_DEFINE_VALARRAY_OPERATOR(*, __multiplies)
_DEFINE_VALARRAY_OPERATOR(/, __divides)
_DEFINE_VALARRAY_OPERATOR(%, __modulus)
_DEFINE_VALARRAY_OPERATOR(+, __plus)
_DEFINE_VALARRAY_OPERATOR(-, __minus)
_DEFINE_VALARRAY_OPERATOR(^, __bitwise_xor)
_DEFINE_VALARRAY_OPERATOR(&, __bitwise_and)
_DEFINE_VALARRAY_OPERATOR(|, __bitwise_or)
_DEFINE_VALARRAY_OPERATOR(<<, __shift_left)
_DEFINE_VALARRAY_OPERATOR(>>, __shift_right)

#undef _DEFINE_VALARRAY_OPERATOR

// @} group numeric_arrays

_GLIBCXX_END_NAMESPACE_VERSION
} // namespace

#endif /* _SLICE_ARRAY_H */

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