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[SVN r7621]

iterators_test.cpp

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+//  Demonstrate and test boost/operators.hpp on std::iterators  --------------//
+
+//  (C) Copyright Jeremy Siek 1999. Permission to copy, use, modify,
+//  sell and distribute this software is granted provided this
+//  copyright notice appears in all copies. This software is provided
+//  "as is" without express or implied warranty, and with no claim as
+//  to its suitability for any purpose.
+
+//  See http://www.boost.org for most recent version including documentation.
+
+//  Revision History
+//  12 Dec 99 Initial version with iterator operators (Jeremy Siek)
+
+#include <string>
+#include <iostream>
+using namespace std;
+
+#include <boost/operators.hpp>
+using namespace boost;
+
+
+template <class T, class R, class P>
+struct test_iter
+  : public boost::random_access_iterator_helper<
+     test_iter<T,R,P>, T, std::ptrdiff_t, P, R>
+{
+  typedef test_iter self;
+  typedef R Reference;
+  typedef std::ptrdiff_t Distance;
+
+public:
+  test_iter(T* i) : _i(i) { }
+  test_iter(const self& x) : _i(x._i) { }
+  self& operator=(const self& x) { _i = x._i; return *this; }
+  Reference operator*() const { return *_i; }
+  self& operator++() { ++_i; return *this; }
+  self& operator--() { --_i; return *this; }
+  self& operator+=(Distance n) { _i += n; return *this; }
+  self& operator-=(Distance n) { _i -= n; return *this; }
+  bool operator==(const self& x) const { return _i == x._i; }
+  bool operator<(const self& x) const { return _i < x._i; }
+  friend Distance operator-(const self& x, const self& y) {
+    return x._i - y._i; 
+  }
+protected:
+  T* _i;
+};
+
+
+int
+main()
+{
+  string array[] = { "apple", "orange", "pear", "peach", "grape", "plum"  };
+  {
+    test_iter<string,string&,string*> i = array, 
+      ie = array + sizeof(array)/sizeof(string);
+
+    // Tests for all of the operators added by random_access_iterator_helper
+
+    // test i++
+    while (i != ie)
+      cout << *i++ << " ";
+    cout << endl;
+    i = array;
+
+    // test i--
+    while (ie != i) {
+      ie--;
+      cout << *ie << " ";
+    }
+    cout << endl;
+    ie = array + sizeof(array)/sizeof(string);
+
+    // test i->m
+    while (i != ie) {
+      cout << i->size() << " ";
+      ++i;
+    }
+    cout << endl;
+    i = array;
+
+    // test i + n
+    while (i < ie) {
+      cout << *i << " ";
+      i = i + 2;
+    }
+    cout << endl;
+    i = array;
+
+    // test n + i
+    while (i < ie) {
+      cout << *i << " ";
+      i = ptrdiff_t(2) + i;
+    }
+    cout << endl;
+    i = array;
+
+    // test i - n
+    while (ie > i) {
+      ie = ie - 2;
+      cout << *ie << " ";
+    }
+    cout << endl;
+    ie = array + sizeof(array)/sizeof(string);
+
+    // test i[n]
+    for (std::size_t j = 0; j < sizeof(array)/sizeof(string); ++j)
+      cout << i[j] << " ";
+    cout << endl;
+  }
+  {
+    test_iter<string, const string&, const string*> i = array, 
+      ie = array + sizeof(array)/sizeof(string);
+
+    // Tests for all of the operators added by random_access_iterator_helper
+
+    // test i++
+    while (i != ie)
+      cout << *i++ << " ";
+    cout << endl;
+    i = array;
+
+    // test i--
+    while (ie != i) {
+      ie--;
+      cout << *ie << " ";
+    }
+    cout << endl;
+    ie = array + sizeof(array)/sizeof(string);
+
+    // test i->m
+    while (i != ie) {
+      cout << i->size() << " ";
+      ++i;
+    }
+    cout << endl;
+    i = array;
+
+    // test i + n
+    while (i < ie) {
+      cout << *i << " ";
+      i = i + 2;
+    }
+    cout << endl;
+    i = array;
+
+    // test n + i
+    while (i < ie) {
+      cout << *i << " ";
+      i = ptrdiff_t(2) + i;
+    }
+    cout << endl;
+    i = array;
+
+    // test i - n
+    while (ie > i) {
+      ie = ie - 2;
+      cout << *ie << " ";
+    }
+    cout << endl;
+    ie = array + sizeof(array)/sizeof(string);
+
+    // test i[n]
+    for (std::size_t j = 0; j < sizeof(array)/sizeof(string); ++j)
+      cout << i[j] << " ";
+    cout << endl;
+  }
+  return 0;
+}