Initial Revision.

[SVN r47768]

example/resize_from_other.cpp

@@ -0,0 +1,57 @@
+// Copyright 2008 The Trustees of Indiana University.
+
+// Use, modification and distribution is subject to the Boost Software 
+// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+//  Boost.MultiArray Library
+//  Authors: Ronald Garcia
+//           Jeremy Siek
+//           Andrew Lumsdaine
+//  See http://www.boost.org/libs/multi_array for documentation.
+
+//
+// resize_from_other.cpp - an experiment in writing a resize function for
+// multi_arrays that will use the extents from another to build itself.
+//
+
+#include <boost/multi_array.hpp>
+#include <boost/static_assert.hpp>
+#include <boost/array.hpp>
+#include <algorithm>
+
+template <typename T, typename U, std::size_t N>
+void
+resize_from_MultiArray(boost::multi_array<T,N>& marray, U& other) {
+
+  // U must be a model of MultiArray
+  boost::function_requires<
+  boost::detail::multi_array::ConstMultiArrayConcept<U,U::dimensionality> >();
+  // U better have U::dimensionality == N
+  BOOST_STATIC_ASSERT(U::dimensionality == N);
+
+  boost::array<typename boost::multi_array<T,N>::size_type, N> shape;
+
+  std::copy(other.shape(), other.shape()+N, shape.begin());
+
+  marray.resize(shape);
+  
+}
+
+#include <iostream>
+
+
+int main () {
+
+  boost::multi_array<int,2> A(boost::extents[5][4]), B;
+  boost::multi_array<int,3> C;
+
+  resize_from_MultiArray(B,A);
+
+#if 0
+  resize_from_MultiArray(C,A); // Compile-time error
+#endif
+
+  std::cout << B.shape()[0] << ", " << B.shape()[1] << '\n';
+
+}