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

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+/**************************************************************************
+ *
+ * indirect_array.cpp -- Indirect array examples
+ *
+ * $Id: indirect_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;
+typedef std::valarray<std::size_t> selector_t;
+
+int main(void) {
+
+  // Create a valarray of integers.
+  valarray_t::value_type vbuf[10] = {0,1,2,3,4,5,6,7,8,9};
+  valarray_t vi(vbuf, (sizeof vbuf / sizeof *vbuf));
+
+  // Create a valarray of indices for a selector.
+  selector_t::value_type sbuf[6] = {0,2,3,4,7,8};
+  selector_t selector(sbuf, (sizeof sbuf / sizeof *sbuf));
+
+  // Print out the valarray<int>.
+  std::cout << "original valarray vi\n\n" << vi << "\n\n";
+
+  // Print out the selective array.
+  std::cout << "vi[0,2,3,4,7,8]\n\n" <<  vi[selector] << "\n\n";
+
+  // Double the selected values.
+  vi[selector] += vi[selector];
+
+  // Print out the modified valarray.
+  std::cout << "vi[0,2,3,4,7,8] += vi[0,2,3,4,7,8]\n\n" << vi << std::endl;
+
+  return 0;
+}
+