git.sesse.net Git - casparcg/blob - dependencies/boost/boost/program_options/environment_iterator.hpp

   1 // Copyright Vladimir Prus 2004.
   2 // Distributed under the Boost Software License, Version 1.0.
   3 // (See accompanying file LICENSE_1_0.txt
   4 // or copy at http://www.boost.org/LICENSE_1_0.txt)
   5
   6 #ifndef BOOST_ENVIRONMENT_ITERATOR_VP_2004_05_14
   7 #define BOOST_ENVIRONMENT_ITERATOR_VP_2004_05_14
   8
   9 #include "eof_iterator.hpp"
  10
  11 #include <utility>
  12 #include <string>
  13 #include <cassert>
  14
  15 namespace boost {
  16
  17     class environment_iterator
  18         : public eof_iterator<environment_iterator,
  19                               std::pair<std::string, std::string> >
  20     {
  21     public:
  22         environment_iterator(char** environment)
  23         : m_environment(environment)
  24         {
  25             get();
  26         }
  27
  28         environment_iterator()
  29         {
  30             found_eof();
  31         }
  32
  33         void get()
  34         {
  35             if (*m_environment == 0)
  36                 found_eof();
  37             else {
  38                 std::string s(*m_environment);
  39                 std::string::size_type n = s.find('=');
  40                 assert(n != s.npos);
  41                 value().first = s.substr(0, n);
  42                 value().second = s.substr(n+1);
  43             }
  44             ++m_environment;
  45         }
  46
  47     private:
  48         char** m_environment;
  49     };
  50 }
  51 #endif