--- /dev/null
+// The template and inlines for the -*- C++ -*- mask_array class.
+
+// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2004, 2005, 2009, 2010
+// 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/mask_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 _MASK_ARRAY_H
+#define _MASK_ARRAY_H 1
+
+#pragma GCC system_header
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+ /**
+ * @addtogroup numeric_arrays
+ * @{
+ */
+
+ /**
+ * @brief Reference to selected subset of an array.
+ *
+ * A mask_array is a reference to the actual elements of an array specified
+ * by a bitmask in the form of an array of bool. The way to get a
+ * mask_array is to call operator[](valarray<bool>) on a valarray. The
+ * returned mask_array then permits carrying operations out on the
+ * referenced subset of elements in the original valarray.
+ *
+ * For example, if a mask_array is obtained using the array (false, true,
+ * false, true) as an argument, the mask array has two elements referring
+ * to array[1] and array[3] in the underlying array.
+ *
+ * @param Tp Element type.
+ */
+ template <class _Tp>
+ class mask_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.
+ mask_array (const mask_array&);
+
+ /// Assignment operator. Assigns elements to corresponding elements
+ /// of @a a.
+ mask_array& operator=(const mask_array&);
+
+ 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;
+
+ // ~mask_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:
+ mask_array(_Array<_Tp>, size_t, _Array<bool>);
+ friend class valarray<_Tp>;
+
+ const size_t _M_sz;
+ const _Array<bool> _M_mask;
+ const _Array<_Tp> _M_array;
+
+ // not implemented
+ mask_array();
+ };
+
+ template<typename _Tp>
+ inline mask_array<_Tp>::mask_array(const mask_array<_Tp>& a)
+ : _M_sz(a._M_sz), _M_mask(a._M_mask), _M_array(a._M_array) {}
+
+ template<typename _Tp>
+ inline
+ mask_array<_Tp>::mask_array(_Array<_Tp> __a, size_t __s, _Array<bool> __m)
+ : _M_sz(__s), _M_mask(__m), _M_array(__a) {}
+
+ template<typename _Tp>
+ inline mask_array<_Tp>&
+ mask_array<_Tp>::operator=(const mask_array<_Tp>& __a)
+ {
+ std::__valarray_copy(__a._M_array, __a._M_mask,
+ _M_sz, _M_array, _M_mask);
+ return *this;
+ }
+
+ template<typename _Tp>
+ inline void
+ mask_array<_Tp>::operator=(const _Tp& __t) const
+ { std::__valarray_fill(_M_array, _M_sz, _M_mask, __t); }
+
+ template<typename _Tp>
+ inline void
+ mask_array<_Tp>::operator=(const valarray<_Tp>& __v) const
+ { std::__valarray_copy(_Array<_Tp>(__v), __v.size(), _M_array, _M_mask); }
+
+ template<typename _Tp>
+ template<class _Ex>
+ inline void
+ mask_array<_Tp>::operator=(const _Expr<_Ex, _Tp>& __e) const
+ { std::__valarray_copy(__e, __e.size(), _M_array, _M_mask); }
+
+#undef _DEFINE_VALARRAY_OPERATOR
+#define _DEFINE_VALARRAY_OPERATOR(_Op, _Name) \
+ template<typename _Tp> \
+ inline void \
+ mask_array<_Tp>::operator _Op##=(const valarray<_Tp>& __v) const \
+ { \
+ _Array_augmented_##_Name(_M_array, _M_mask, \
+ _Array<_Tp>(__v), __v.size()); \
+ } \
+ \
+ template<typename _Tp> \
+ template<class _Dom> \
+ inline void \
+ mask_array<_Tp>::operator _Op##=(const _Expr<_Dom, _Tp>& __e) const\
+ { \
+ _Array_augmented_##_Name(_M_array, _M_mask, __e, __e.size()); \
+ }
+
+_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 /* _MASK_ARRAY_H */
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