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

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+/**************************************************************************
+ *
+ * count.cpp - Example program for counting number of elements in container. 
+ *
+ * $Id: count.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 count, count_if
+#include <cassert>      // for assert
+#include <functional>   // bind2nd, less
+#include <iostream>     // for cout
+#include <iterator>     // for ostream_iterator
+#include <vector>       // for vector
+ 
+#include <examples.h>
+
+
+// streams out a vector
+template <class T>
+std::ostream&
+operator<< (std::ostream &out,
+            const std::vector<T, std::allocator<T> > &vec)
+{
+    typedef std::ostream_iterator<T, char, std::char_traits<char> > Iter;
+
+    out << "{ ";
+
+    std::copy (vec.begin (), vec.end (), Iter (out, " "));
+
+    out << "}";
+
+    return out;
+}
+
+
+int main ()
+{
+    // Typedef for convenience.
+    typedef std::vector<short, std::allocator<short> > Vector;
+
+    const Vector::value_type a [] = { 1, 2, 3, 4, 5, 5, 7, 8, 9, 10 };
+
+    // construct a vector from the array
+    const Vector vec (a + 0, a + 10);
+
+    Vector::size_type n_fives = 0;
+    Vector::size_type n_sixes = 0;
+    Vector::size_type n_lt_8  = 0;
+
+#ifndef _RWSTD_NO_EXT_VOID_COUNT
+
+    // using the extended overloads of function template count()
+    // and count_if() provided by this implmentation, count the
+    // number of fives, sixes, and values less than 8 in the
+    // sequence
+
+    std::count (vec.begin (), vec.end (), 5, n_fives);
+    std::count (vec.begin (), vec.end (), 6, n_sixes);
+
+    std::count_if (vec.begin (), vec.end (),
+                   std::bind2nd (std::less<Vector::value_type>(), 8),
+                   n_lt_8);
+
+    assert (2 == n_fives);
+    assert (0 == n_sixes);
+    assert (7 == n_lt_8);
+
+#endif   // _RWSTD_NO_EXT_VOID_COUNT
+
+    // do the same using the standard function templates count()
+    // and count_if()
+
+    n_fives = std::count (vec.begin (), vec.end (), 5);
+    n_sixes = std::count (vec.begin (), vec.end (), 6);
+    n_lt_8  = std::count_if (vec.begin (), vec.end (),
+                             std::bind2nd (std::less<Vector::value_type>(), 8));
+
+    std::cout << "sequence: " << vec;
+    std::cout << "\nnumber of fives: " << n_fives
+              << "\nnumber of sixes: " << n_sixes
+              << "\nnumber of values less than 8: " << n_lt_8 << '\n';
+
+    return 0;
+}