--- /dev/null
+// The template and inlines for the -*- C++ -*- slice_array class.
+
+// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2004, 2005, 2006, 2009,
+// 2010, 2011 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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