boost/libs/array/array3.cpp

   1 /* example for using class array<>
   2  * (C) Copyright Nicolai M. Josuttis 2001.
   3  * Distributed under the Boost Software License, Version 1.0. (See
   4  * accompanying file LICENSE_1_0.txt or copy at
   5  * http://www.boost.org/LICENSE_1_0.txt)
   6  */
   7
   8 #include <string>
   9 #include <iostream>
  10 #include <boost/array.hpp>
  11
  12 template <class T>
  13 void print_elements (const T& x);
  14
  15 int main()
  16 {
  17     // create array of four seasons
  18     boost::array<std::string,4> seasons = {
  19         { "spring", "summer", "autumn", "winter" }
  20     };
  21
  22     // copy and change order
  23     boost::array<std::string,4> seasons_orig = seasons;
  24     for (unsigned i=seasons.size()-1; i>0; --i) {
  25         std::swap(seasons.at(i),seasons.at((i+1)%seasons.size()));
  26     }
  27
  28     std::cout << "one way:   ";
  29     print_elements(seasons);
  30
  31     // try swap()
  32     std::cout << "other way: ";
  33     std::swap(seasons,seasons_orig);
  34     print_elements(seasons);
  35
  36     // try reverse iterators
  37     std::cout << "reverse:   ";
  38     for (boost::array<std::string,4>::reverse_iterator pos
  39            =seasons.rbegin(); pos<seasons.rend(); ++pos) {
  40         std::cout << " " << *pos;
  41     }
  42     std::cout << std::endl;
  43
  44     return 0;  // makes Visual-C++ compiler happy
  45 }
  46
  47 template <class T>
  48 void print_elements (const T& x)
  49 {
  50     for (unsigned i=0; i<x.size(); ++i) {
  51         std::cout << " " << x[i];
  52     }
  53     std::cout << std::endl;
  54 }
  55