ceph/src/boost/libs/convert/example/default_converter.cpp

   1 // Boost.Convert test and usage example
   2 // Copyright (c) 2009-2016 Vladimir Batov.
   3 // Use, modification and distribution are subject to the Boost Software License,
   4 // Version 1.0. See http://www.boost.org/LICENSE_1_0.txt.
   5
   6 #include <boost/convert.hpp>
   7 #include <boost/convert/stream.hpp>
   8 #include <boost/detail/lightweight_test.hpp>
   9
  10 #ifdef ONLY_FOR_DEMONSTRATION_PURPOSES
  11 //[default_converter_declaration_simple
  12 struct boost::cnv::by_default : public boost::cnv::cstream {};
  13 //]
  14 #endif
  15 //[default_converter_declaration_formatted
  16 struct boost::cnv::by_default : public boost::cnv::cstream
  17 {
  18     by_default() { (*this)(std::uppercase)(std::hex); }
  19 };
  20 //]
  21
  22 int
  23 main(int, char const* [])
  24 {
  25     //[default_converter_example1
  26     // No explicit converter provided. boost::cnv::by_default is used.
  27     int         i = boost::convert<int>("F").value_or(-1);
  28     std::string s = boost::convert<std::string>(255).value_or("bad");
  29
  30     // 'i' and 's' are converted using boost::cnv::cstream
  31     // with std::uppercase and std::hex formatting applied.
  32
  33     BOOST_TEST(i == 15);   // 15(10) = F(16)
  34     BOOST_TEST(s == "FF"); // 255(10) = FF(16)
  35     //]
  36
  37     return boost::report_errors();
  38 }
  39