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     const size_t __n = __a.size();
  53     // XXX: This ugly cast is necessary because
  54     //      valarray::operator[]() const return a VALUE!
  55     //      Try to get the committee to correct that gross error.
  56     valarray<size_t>& __t = const_cast<valarray<size_t>&>(__a);
  57     return __valarray_product(&__t[0], &__t[0] + __n);
  58   }
  59
  60   // Map a gslice, described by its multidimensional LENGTHS
  61   // and corresponding STRIDES, to a linear array of INDEXES
  62   // for the purpose of indexing a flat, one-dimensional array
  63   // representation of a gslice_array.
  64   void
  65   __gslice_to_index(size_t __o, const valarray<size_t>& __l,
  66                     const valarray<size_t>& __s, valarray<size_t>& __i)
  67   {
  68     // There are as many dimensions as there are strides.
  69     const size_t __n = __l.size();
  70
  71     // Holds current multi-index as we go through the gslice for the
  72     // purpose of computing its linear-image.
  73     valarray<size_t> __t(__l);
  74
  75     // Note that this should match the product of all numbers appearing
  76     // in __l which describes the multidimensional sizes of the
  77     // generalized slice.
  78     const size_t __z = __i.size();
  79
  80     for (size_t __j = 0; __j < __z; ++__j)
  81       {
  82         // Compute the linear-index image of (t_0, ... t_{n-1}).
  83         __i[__j] = __o;
  84
  85         --__t[__n - 1];
  86         __o += __s[__n - 1];
  87
  88         // Process the next multi-index.  The loop ought to be
  89         // backward since we're making a lexicographical visit.
  90         for (size_t __k2 = __n - 1; __k2 && !__t[__k2]; --__k2)
  91           {
  92             __o -= __s[__k2] * __l[__k2];
  93             __t[__k2] = __l[__k2];
  94
  95             --__t[__k2 - 1];
  96             __o += __s[__k2 - 1];
  97           }
  98       }
  99   }
 100
 101   gslice::_Indexer::_Indexer(size_t __o, const valarray<size_t>& __l,
 102                              const valarray<size_t>& __s)
 103   : _M_count(1), _M_start(__o), _M_size(__l), _M_stride(__s),
 104     _M_index(__l.size() == 0 ? 0 : __valarray_product(__l))
 105   { __gslice_to_index(__o, __l, __s, _M_index); }
 106
 107 _GLIBCXX_END_NAMESPACE_VERSION
 108 } // namespace