libstdc++-v3/src/valarray.cc

   1 // Explicit instantiation file.
   2
   3 // Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2009
   4 // Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 3, or (at your option)
  10 // any later version.
  11
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16
  17 // Under Section 7 of GPL version 3, you are granted additional
  18 // permissions described in the GCC Runtime Library Exception, version
  19 // 3.1, as published by the Free Software Foundation.
  20
  21 // You should have received a copy of the GNU General Public License and
  22 // a copy of the GCC Runtime Library Exception along with this program;
  23 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  24 // <http://www.gnu.org/licenses/>.
  25
  26 //
  27 // ISO C++ 14882:
  28 //
  29
  30 #include <valarray>
  31
  32 namespace std _GLIBCXX_VISIBILITY(default)
  33 {
  34 _GLIBCXX_BEGIN_NAMESPACE_VERSION
  35
  36   // Some explicit instantiations.
  37   template void
  38      __valarray_fill(size_t* __restrict__, size_t, const size_t&);
  39
  40   template void
  41      __valarray_copy(const size_t* __restrict__, size_t, size_t* __restrict__);
  42
  43   template valarray<size_t>::valarray(size_t);
  44   template valarray<size_t>::valarray(const valarray<size_t>&);
  45   template valarray<size_t>::~valarray();
  46   template size_t valarray<size_t>::size() const;
  47   template size_t& valarray<size_t>::operator[](size_t);
  48
  49   inline size_t
  50   __valarray_product(const valarray<size_t>& __a)
  51   {
  52     typedef const size_t* __restrict__ _Tp;
  53     const size_t __n = __a.size();
  54     // XXX: This ugly cast is necessary because
  55     //      valarray::operator[]() const return a VALUE!
  56     //      Try to get the committee to correct that gross error.
  57     valarray<size_t>& __t = const_cast<valarray<size_t>&>(__a);
  58     return __valarray_product(&__t[0], &__t[0] + __n);
  59   }
  60
  61   // Map a gslice, described by its multidimensional LENGTHS
  62   // and corresponding STRIDES, to a linear array of INDEXES
  63   // for the purpose of indexing a flat, one-dimensional array
  64   // representation of a gslice_array.
  65   void
  66   __gslice_to_index(size_t __o, const valarray<size_t>& __l,
  67                     const valarray<size_t>& __s, valarray<size_t>& __i)
  68   {
  69     // There are as many dimensions as there are strides.
  70     const size_t __n = __l.size();
  71
  72     // Holds current multi-index as we go through the gslice for the
  73     // purpose of computing its linear-image.
  74     valarray<size_t> __t(__l);
  75
  76     // Note that this should match the product of all numbers appearing
  77     // in __l which describes the multidimensional sizes of the
  78     // generalized slice.
  79     const size_t __z = __i.size();
  80
  81     for (size_t __j = 0; __j < __z; ++__j)
  82       {
  83         // Compute the linear-index image of (t_0, ... t_{n-1}).
  84         __i[__j] = __o;
  85
  86         --__t[__n - 1];
  87         __o += __s[__n - 1];
  88
  89         // Process the next multi-index.  The loop ought to be
  90         // backward since we're making a lexicographical visit.
  91         for (size_t __k2 = __n - 1; __k2 && !__t[__k2]; --__k2)
  92           {
  93             __o -= __s[__k2] * __l[__k2];
  94             __t[__k2] = __l[__k2];
  95
  96             --__t[__k2 - 1];
  97             __o += __s[__k2 - 1];
  98           }
  99       }
 100   }
 101
 102   gslice::_Indexer::_Indexer(size_t __o, const valarray<size_t>& __l,
 103                              const valarray<size_t>& __s)
 104   : _M_count(1), _M_start(__o), _M_size(__l), _M_stride(__s),
 105     _M_index(__l.size() == 0 ? 0 : __valarray_product(__l))
 106   { __gslice_to_index(__o, __l, __s, _M_index); }
 107
 108 _GLIBCXX_END_NAMESPACE_VERSION
 109 } // namespace