Version_1_18_3/boost/libs/utility/iterators_test.cpp

   1 //  Demonstrate and test boost/operators.hpp on std::iterators  --------------//
   2
   3 //  (C) Copyright Jeremy Siek 1999. Permission to copy, use, modify,
   4 //  sell and distribute this software is granted provided this
   5 //  copyright notice appears in all copies. This software is provided
   6 //  "as is" without express or implied warranty, and with no claim as
   7 //  to its suitability for any purpose.
   8
   9 //  See http://www.boost.org for most recent version including documentation.
  10
  11 //  Revision History
  12 //  12 Dec 99 Initial version with iterator operators (Jeremy Siek)
  13
  14 #include <string>
  15 #include <iostream>
  16 using namespace std;
  17
  18 #include <boost/operators.hpp>
  19 using namespace boost;
  20
  21
  22 template <class T, class R, class P>
  23 struct test_iter
  24   : public boost::random_access_iterator_helper<
  25      test_iter<T,R,P>, T, std::ptrdiff_t, P, R>
  26 {
  27   typedef test_iter self;
  28   typedef R Reference;
  29   typedef std::ptrdiff_t Distance;
  30
  31 public:
  32   test_iter(T* i) : _i(i) { }
  33   test_iter(const self& x) : _i(x._i) { }
  34   self& operator=(const self& x) { _i = x._i; return *this; }
  35   Reference operator*() const { return *_i; }
  36   self& operator++() { ++_i; return *this; }
  37   self& operator--() { --_i; return *this; }
  38   self& operator+=(Distance n) { _i += n; return *this; }
  39   self& operator-=(Distance n) { _i -= n; return *this; }
  40   bool operator==(const self& x) const { return _i == x._i; }
  41   bool operator<(const self& x) const { return _i < x._i; }
  42   friend Distance operator-(const self& x, const self& y) {
  43     return x._i - y._i;
  44   }
  45 protected:
  46   T* _i;
  47 };
  48
  49
  50 int
  51 main()
  52 {
  53   string array[] = { "apple", "orange", "pear", "peach", "grape", "plum"  };
  54   {
  55     test_iter<string,string&,string*> i = array,
  56       ie = array + sizeof(array)/sizeof(string);
  57
  58     // Tests for all of the operators added by random_access_iterator_helper
  59
  60     // test i++
  61     while (i != ie)
  62       cout << *i++ << " ";
  63     cout << endl;
  64     i = array;
  65
  66     // test i--
  67     while (ie != i) {
  68       ie--;
  69       cout << *ie << " ";
  70     }
  71     cout << endl;
  72     ie = array + sizeof(array)/sizeof(string);
  73
  74     // test i->m
  75     while (i != ie) {
  76       cout << i->size() << " ";
  77       ++i;
  78     }
  79     cout << endl;
  80     i = array;
  81
  82     // test i + n
  83     while (i < ie) {
  84       cout << *i << " ";
  85       i = i + 2;
  86     }
  87     cout << endl;
  88     i = array;
  89
  90     // test n + i
  91     while (i < ie) {
  92       cout << *i << " ";
  93       i = ptrdiff_t(2) + i;
  94     }
  95     cout << endl;
  96     i = array;
  97
  98     // test i - n
  99     while (ie > i) {
 100       ie = ie - 2;
 101       cout << *ie << " ";
 102     }
 103     cout << endl;
 104     ie = array + sizeof(array)/sizeof(string);
 105
 106     // test i[n]
 107     for (std::size_t j = 0; j < sizeof(array)/sizeof(string); ++j)
 108       cout << i[j] << " ";
 109     cout << endl;
 110   }
 111   {
 112     test_iter<string, const string&, const string*> i = array,
 113       ie = array + sizeof(array)/sizeof(string);
 114
 115     // Tests for all of the operators added by random_access_iterator_helper
 116
 117     // test i++
 118     while (i != ie)
 119       cout << *i++ << " ";
 120     cout << endl;
 121     i = array;
 122
 123     // test i--
 124     while (ie != i) {
 125       ie--;
 126       cout << *ie << " ";
 127     }
 128     cout << endl;
 129     ie = array + sizeof(array)/sizeof(string);
 130
 131     // test i->m
 132     while (i != ie) {
 133       cout << i->size() << " ";
 134       ++i;
 135     }
 136     cout << endl;
 137     i = array;
 138
 139     // test i + n
 140     while (i < ie) {
 141       cout << *i << " ";
 142       i = i + 2;
 143     }
 144     cout << endl;
 145     i = array;
 146
 147     // test n + i
 148     while (i < ie) {
 149       cout << *i << " ";
 150       i = ptrdiff_t(2) + i;
 151     }
 152     cout << endl;
 153     i = array;
 154
 155     // test i - n
 156     while (ie > i) {
 157       ie = ie - 2;
 158       cout << *ie << " ";
 159     }
 160     cout << endl;
 161     ie = array + sizeof(array)/sizeof(string);
 162
 163     // test i[n]
 164     for (std::size_t j = 0; j < sizeof(array)/sizeof(string); ++j)
 165       cout << i[j] << " ";
 166     cout << endl;
 167   }
 168   return 0;
 169 }