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

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+/**************************************************************************
+ *
+ * lex_comp.cpp - Example program compares to ranges lexicographically.
+ *
+ * $Id: lex_compare.cpp 648752 2008-04-16 17:01:56Z faridz $
+ *
+ ***************************************************************************
+ *
+ * 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 lexicographical_compare
+#include <functional>   // for less
+#include <ios>          // for boolalpha
+#include <iostream>     // for cout, endl
+#include <vector>       // for vector
+
+#include <examples.h>
+
+
+int main()
+{
+    typedef std::vector<int, std::allocator<int> > Vector;
+
+    const Vector::value_type d1[] = { 1, 3, 5, 32, 64 };
+    const Vector::value_type d2[] = { 1, 3, 2, 43, 56 };
+
+    // Create vectors.
+    const Vector v1 (d1 + 0, d1 + sizeof d1 / sizeof *d1);
+    const Vector v2 (d2 + 0, d2 + sizeof d1 / sizeof *d2);
+
+    // Is v1 less than v2 (I think not).
+    bool b1 = std::lexicographical_compare (v1.begin (), v1.end (),
+                                            v2.begin (), v2.end ());
+    // Is v2 less than v1 (yup, sure is).
+    bool b2 = std::lexicographical_compare (v2.begin (), v2.end (),
+                                            v1.begin (), v1.end (),
+                                            std::less<int>());
+    std::cout << std::boolalpha << b1
+              << " " << b2 << std::endl;
+
+    return 0;
+}