boost/multi_array/copy_array.hpp

   1 // Copyright 2002 The Trustees of Indiana University.
   2
   3 // Use, modification and distribution is subject to the Boost Software
   4 // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
   5 // http://www.boost.org/LICENSE_1_0.txt)
   6
   7 //  Boost.MultiArray Library
   8 //  Authors: Ronald Garcia
   9 //           Jeremy Siek
  10 //           Andrew Lumsdaine
  11 //  See http://www.boost.org/libs/multi_array for documentation.
  12
  13 #ifndef COPY_ARRAY_RG092101_HPP
  14 #define COPY_ARRAY_RG092101_HPP
  15
  16 //
  17 // copy_array.hpp - generic code for copying the contents of one
  18 // Basic_MultiArray to another.  We assume that they are of the same
  19 // shape
  20 //
  21 #include "boost/type.hpp"
  22 #include "boost/assert.hpp"
  23
  24 namespace boost {
  25 namespace detail {
  26 namespace multi_array {
  27
  28 template <typename Element>
  29 class copy_dispatch {
  30 public:
  31   template <typename SourceIterator, typename DestIterator>
  32   static void copy_array (SourceIterator first, SourceIterator last,
  33                    DestIterator result) {
  34     while (first != last) {
  35       copy_array(*first++,*result++);
  36     }
  37   }
  38 private:
  39   // Array2 has to be passed by VALUE here because subarray
  40   // pseudo-references are temporaries created by iterator::operator*()
  41   template <typename Array1, typename Array2>
  42   static void copy_array (const Array1& source, Array2 dest) {
  43     copy_array(source.begin(),source.end(),dest.begin());
  44   }
  45
  46   static void copy_array (const Element& source, Element& dest) {
  47     dest = source;
  48   }
  49
  50 };
  51
  52
  53 template <typename Array1, typename Array2>
  54 void copy_array (Array1& source, Array2& dest) {
  55   BOOST_ASSERT(std::equal(source.shape(),source.shape()+source.num_dimensions(),
  56                           dest.shape()));
  57   // Dispatch to the proper function
  58   typedef typename Array1::element element_type;
  59   copy_dispatch<element_type>::
  60     copy_array(source.begin(),source.end(),dest.begin());
  61 }
  62
  63
  64 } // namespace multi_array
  65 } // namespace detail
  66 } // namespace boost
  67
  68 #endif // COPY_ARRAY_RG092101_HPP