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

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+/**************************************************************************
+ *
+ * negator.cpp - Example program for reversing the sense of predicate 
+ *               function objects by using function adaptors and function
+ *               objects.
+ *
+ * $Id: negator.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 <functional>   // for unary_function
+#include <ios>          // for boolalpha
+#include <iostream>     // for cout, endl
+
+#include <examples.h>
+
+
+// Create a new predicate from unary_function.
+template <class Arg>
+struct is_odd : public std::unary_function<Arg, bool>
+{
+    bool operator() (const Arg &arg1) const {
+        return arg1 % 2 != 0;
+    }
+};
+
+
+int main ()
+{
+    std::less<int> less_func;
+
+    // Use not2 on less.
+    std::cout << std::boolalpha
+              << less_func (1, 4) << '\n'
+              << less_func (4, 1) << '\n'
+              << std::not2 (std::less<int>())(1, 4) << '\n'
+              << std::not2 (std::less<int>())(4, 1) << '\n';
+
+    // Create an instance of our predicate.
+    is_odd<int> odd;
+
+    // Use not1 on our user defined predicate.
+    std::cout << odd (1) << '\n'
+              << odd (4) << '\n'
+              << std::not1 (odd)(1) << '\n'
+              << std::not1 (odd)(4) << std::endl;
+
+    return 0;
+}