first commit

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

@@ -0,0 +1,70 @@
+/**************************************************************************
+ *
+ * binders.cpp - Example program for binder1st & binder2nd.
+ *
+ * $Id: binders.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 find_if
+#include <functional>  // for equal_to, bind1st, bind2nd
+#include <iostream>    // for cout, endl
+#include <vector>      // for vector
+
+#include <examples.h>
+
+
+int main ()
+{
+    typedef std::vector<int, std::allocator<int> > Vector;
+    typedef std::equal_to<Vector::value_type>      equal_to;
+
+    const Vector::value_type arr [] = { 1, 2, 3, 4 };
+
+    // Set up a vector.
+    Vector v1 (arr + 0, arr + sizeof arr / sizeof *arr);
+
+    // Create an 'equal to 3' unary predicate by binding 3 to
+    // the equal_to binary predicate.
+    std::binder1st<equal_to> equal_to_3 = std::bind1st (equal_to (), 3);
+
+    // Now use this new predicate in a call to find_if.
+    Vector::iterator it1 = std::find_if (v1.begin (), v1.end (),
+                                         equal_to_3);
+
+    // Even better, construct the new predicate on the fly.
+    Vector::iterator it2 =
+        std::find_if (v1.begin (), v1.end (),
+                      std::bind1st (equal_to (), 3)); 
+
+    // And now the same thing using bind2nd.
+    // Same result since equal_to is commutative.
+    Vector::iterator it3 =
+        std::find_if (v1.begin (), v1.end (),
+                      std::bind2nd (equal_to (), 3)); 
+
+    // Output results.
+    std::cout << *it1 << " " << *it2 << " " << *it3 << std::endl;
+
+    return 0;
+}