first commit

extern/stdcxx/4.2.1/examples/manual/gslice_array.cpp

@@ -0,0 +1,72 @@
+/**************************************************************************
+ *
+ * gslice_array.cpp -- Generalized array slice examples
+ *
+ * $Id: gslice_array.cpp 550991 2007-06-26 23:58:07Z sebor $
+ *
+ ***************************************************************************
+ *
+ * Licensed to the Apache Software  Foundation (ASF) under one or more
+ * contributor  license agreements.  See  the NOTICE  file distributed
+ * with  this  work  for  additional information  regarding  copyright
+ * ownership.   The ASF  licenses this  file to  you under  the Apache
+ * License, Version  2.0 (the  "License"); you may  not use  this file
+ * except in  compliance with the License.   You may obtain  a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the  License is distributed on an  "AS IS" BASIS,
+ * WITHOUT  WARRANTIES OR CONDITIONS  OF ANY  KIND, either  express or
+ * implied.   See  the License  for  the  specific language  governing
+ * permissions and limitations under the License.
+ *
+ * Copyright 1994-2006 Rogue Wave Software.
+ * 
+ **************************************************************************/
+
+#include <iostream>    // for cout, endl
+#include <valarray.h>  // Includes valarray and provides stream inserter.
+#include <examples.h>  // Generic header for all examples.
+
+typedef std::valarray<int> valarray_t;
+
+int main(void) {
+
+  valarray_t::value_type
+      ibuf[22] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9,  10,
+                   11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21 };
+
+  // Create a valarray of ints
+  valarray_t  vi (ibuf,(sizeof ibuf / sizeof *ibuf));
+
+  // Print out the valarray
+  std::cout << "original valarray vi:\n\n" << vi << "\n\n";
+
+  // Get a two dimensional diagonal slice out of the middle
+  std::size_t length_ary[] = {4, 2};
+  std::size_t stride_ary[] = {4, 6};
+
+  std::valarray<std::size_t> length_val(length_ary, 2);
+  std::valarray<std::size_t> stride_val(stride_ary, 2);
+
+
+  // Print out the slices starting at positions 0 and 2 and respectively.
+  std::cout << "vi[gslice(0,[4,2],[4,6])]\n\n"
+            << vi[std::gslice(0,length_val,stride_val)] << "\n\n";
+
+  std::cout << "vi[gslice(2,[4,2],[4,6])]\n\n"
+            << vi[std::gslice(2,length_val,stride_val)] << "\n\n";
+
+  // Multiply the first slice by the second.
+  vi[std::gslice(0,length_val,stride_val)]
+      *= static_cast<valarray_t > (vi[std::gslice(2,length_val,stride_val)]);
+
+  std::cout << "vi[gslice(0,[4,2],[4,8])] *= vi[gslice(2,[4,2],[4,6])]\n\n"
+            << vi << std::endl;
+
+  return 0;
+
+}
+