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

   1 // Copyright (c) 2009-2016 Vladimir Batov.
   2 // Use, modification and distribution are subject to the Boost Software License,
   3 // Version 1.0. See http://www.boost.org/LICENSE_1_0.txt.
   4
   5 //[lexical_cast_headers1
   6 #include <boost/convert.hpp>
   7 #include <boost/convert/lexical_cast.hpp>
   8 #include <boost/detail/lightweight_test.hpp>
   9
  10 using std::string;
  11 using boost::convert;
  12 using boost::lexical_cast;
  13
  14 struct boost::cnv::by_default : boost::cnv::lexical_cast {};
  15 //]
  16
  17 int
  18 main(int, char const* [])
  19 {
  20     //[lexical_cast_example1
  21     int    i1 = lexical_cast<int>("123");         // Throws if the conversion fails.
  22     int    i2 = convert<int>("123").value();      // Throws if the conversion fails.
  23     int    i3 = convert<int>("uhm").value_or(-1); // Returns -1 if the conversion fails.
  24     string s1 = lexical_cast<string>(123);
  25     string s2 = convert<string>(123).value();
  26
  27     BOOST_TEST(i1 == 123);
  28     BOOST_TEST(i2 == 123);
  29     BOOST_TEST(i3 == -1);
  30     BOOST_TEST(s1 == "123");
  31     BOOST_TEST(s2 == "123");
  32     //]
  33
  34     return boost::report_errors();
  35 }