ceph/src/boost/libs/multi_array/example/subview.cpp

   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
  14 #include "boost/multi_array.hpp"
  15 #include "boost/cstdlib.hpp"
  16
  17 int
  18 main()
  19 {
  20   const int ndims=3;
  21   typedef boost::multi_array<int,ndims> array;
  22
  23   int data[] = {
  24     0,1,2,3,
  25     4,5,6,7,
  26     8,9,10,11,
  27
  28     12,13,14,15,
  29     16,17,18,19,
  30     20,21,22,23
  31   };
  32   const int data_size=24;
  33
  34   array myarray(boost::extents[2][3][4]);
  35   myarray.assign(data,data+data_size);
  36
  37   //
  38   // array_view dims:
  39   // [base,stride,bound)
  40   // [0,1,2), [1,1,3), [0,2,4)
  41   //
  42
  43   typedef array::index_range range;
  44   array::array_view<ndims>::type myview =
  45     myarray[boost::indices[range(0,2)][range(1,3)][range(0,4,2)]];
  46
  47   for (array::index i = 0; i != 2; ++i)
  48     for (array::index j = 0; j != 2; ++j)
  49       for (array::index k = 0; k != 2; ++k)
  50         assert(myview[i][j][k] == myarray[i][j+1][k*2]);
  51
  52   return boost::exit_success;
  53 }