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

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+/**************************************************************************
+ *
+ * for_each.cpp - Example program for applying a function to each element 
+ *                in a range.
+ *
+ * $Id: for_each.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 for_each
+#include <functional>   // for less, unary_function
+#include <iostream>     // for cout, endl
+#include <set>          // for set
+
+#include <examples.h>
+
+
+// Function object that outputs its argument times x.
+template <class Arg>
+class out_times_x:  public std::unary_function<Arg, void>
+{
+    Arg multiplier;
+public:
+    out_times_x (const Arg &x) : multiplier (x) { }
+
+    void operator() (const Arg &x) const {
+        std::cout << x * multiplier << " " << std::endl;
+    }
+};
+
+
+int main ()
+{
+    // Typedef for convenience.
+    typedef std::set<int, std::less<int>, std::allocator<int> > sequence;
+    
+    sequence::value_type arr [] = { 1, 2, 3, 4, 5 };
+
+    // Populate a sequence from arr.
+    sequence s (arr, arr + sizeof arr / sizeof *arr);
+
+    // Construct a function object.
+    out_times_x<sequence::value_type> f2 (2);
+  
+    // Apply function object's operator() to each element.
+    std::for_each (s.begin (), s.end (), f2);
+  
+    return 0;
+}