slice_array.h

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// The template and inlines for the -*- C++ -*- slice_array class.
 
// Copyright (C) 1997-2025 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
 
#ifdef _GLIBCXX_SYSHDR
#pragma GCC system_header
#endif
 
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;
 
#if __cpp_impl_three_way_comparison >= 201907L
    /// Equality comparison
    friend bool operator==(const slice&, const slice&) = default;
#endif
 
  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;
 
#if __cplusplus < 201103L
      // not implemented
      slice_array();
#else
    public:
      slice_array() = delete;
#endif
    };
 
  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); }
 
  /// @cond undocumented
#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
  /// @endcond
 
  /// @} group numeric_arrays
 
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace
 
#endif /* _SLICE_ARRAY_H */