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

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+/**************************************************************************
+ *
+ * io_iter.cpp - Example program of iterator.
+ *
+ * $Id: stream_iterator.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 <algorithm>  // for copy
+#include <iostream>   // for cin, cout, endl
+#include <iterator>   // for stream_iterators, inserter
+#include <vector>     // for vector
+#include <numeric>    // for accumulate
+
+#include <examples.h>
+
+int main ()
+{
+    // Typedefs for convenience.
+    typedef std::vector<int, std::allocator<int> > Vector;
+
+    typedef std::istream_iterator<Vector::value_type,
+                                  char, std::char_traits<char>,
+                                  std::ptrdiff_t> is_iter;
+
+    typedef std::ostream_iterator<Vector::value_type,
+                                  char, std::char_traits<char> > os_iter;
+
+    Vector v;
+
+    Vector::value_type sum = 0;
+
+    // Collect values from cin until end of file
+    // Note use of default constructor to get ending iterator
+    std::cout << "Enter a sequence of integers (eof to quit): " ;
+    std::copy (is_iter (std::cin), is_iter (), std::inserter (v, v.begin ()));
+
+    // Stream the whole vector and the sum to cout.
+    std::copy (v.begin (), v.end () -1, os_iter (std::cout, " + "));
+
+    if (v.size ())
+        std::cout << v.back () << " = " <<  
+            std::accumulate (v.begin (), v.end (), sum) << std::endl;
+
+    return 0;
+}