libstdc++-v3/src/c++98/valarray.cc

   1 // Explicit instantiation file.
   2
   3 // Copyright (C) 2001-2019 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 //
  26 // ISO C++ 14882:
  27 //
  28
  29 #include <valarray>
  30
  31 namespace std _GLIBCXX_VISIBILITY(default)
  32 {
  33 _GLIBCXX_BEGIN_NAMESPACE_VERSION
  34
  35   // Some explicit instantiations.
  36   template void
  37      __valarray_fill(size_t* __restrict__, size_t, const size_t&);
  38
  39   template void
  40      __valarray_copy(const size_t* __restrict__, size_t, size_t* __restrict__);
  41
  42   template valarray<size_t>::valarray(size_t);
  43   template valarray<size_t>::valarray(const valarray<size_t>&);
  44   template valarray<size_t>::~valarray();
  45   template size_t valarray<size_t>::size() const;
  46   template size_t& valarray<size_t>::operator[](size_t);
  47
  48   // Compute the product of all elements in the non-empty range [__f, __l)
  49   template<typename _Tp>
  50     inline _Tp
  51     __valarray_product(const _Tp* __f, const _Tp* __l)
  52     {
  53       _Tp __r = *__f++;
  54       while (__f != __l)
  55         __r = __r * *__f++;
  56       return __r;
  57     }
  58
  59   inline size_t
  60   __valarray_product(const valarray<size_t>& __a)
  61   {
  62     return __valarray_product(&__a[0], &__a[0] + __a.size());
  63   }
  64
  65   // Map a gslice, described by its multidimensional LENGTHS
  66   // and corresponding STRIDES, to a linear array of INDEXES
  67   // for the purpose of indexing a flat, one-dimensional array
  68   // representation of a gslice_array.
  69   void
  70   __gslice_to_index(size_t __o, const valarray<size_t>& __l,
  71                     const valarray<size_t>& __s, valarray<size_t>& __i)
  72   {
  73     // There are as many dimensions as there are strides.
  74     const size_t __n = __l.size();
  75
  76     // Holds current multi-index as we go through the gslice for the
  77     // purpose of computing its linear-image.
  78     valarray<size_t> __t(__l);
  79
  80     // Note that this should match the product of all numbers appearing
  81     // in __l which describes the multidimensional sizes of the
  82     // generalized slice.
  83     const size_t __z = __i.size();
  84
  85     for (size_t __j = 0; __j < __z; ++__j)
  86       {
  87         // Compute the linear-index image of (t_0, ... t_{n-1}).
  88         __i[__j] = __o;
  89
  90         --__t[__n - 1];
  91         __o += __s[__n - 1];
  92
  93         // Process the next multi-index.  The loop ought to be
  94         // backward since we're making a lexicographical visit.
  95         for (size_t __k2 = __n - 1; __k2 && !__t[__k2]; --__k2)
  96           {
  97             __o -= __s[__k2] * __l[__k2];
  98             __t[__k2] = __l[__k2];
  99
 100             --__t[__k2 - 1];
 101             __o += __s[__k2 - 1];
 102           }
 103       }
 104   }
 105
 106   gslice::_Indexer::_Indexer(size_t __o, const valarray<size_t>& __l,
 107                              const valarray<size_t>& __s)
 108   : _M_count(1), _M_start(__o), _M_size(__l), _M_stride(__s),
 109     _M_index(__l.size() == 0 ? 0 : __valarray_product(__l))
 110   { __gslice_to_index(__o, __l, __s, _M_index); }
 111
 112 _GLIBCXX_END_NAMESPACE_VERSION
 113 } // namespace