ceph/src/boost/libs/convert/include/boost/convert/lexical_cast.hpp

   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 #ifndef BOOST_CONVERT_LEXICAL_CAST_HPP
   6 #define BOOST_CONVERT_LEXICAL_CAST_HPP
   7
   8 #include <boost/lexical_cast.hpp>
   9
  10 namespace boost { namespace cnv
  11 {
  12     struct lexical_cast;
  13 }}
  14
  15 /// @brief boost::lexical_cast-based converter
  16 /// @details The purpose of the converter is to
  17 /// * Make use of the boost::lexical_cast functionality and performance that many people have become
  18 /// accustomed to and comfortable with;
  19 /// * Demonstrate how existing independent conversion/transformation-related facilities might be
  20 //  incorporated in to the Boost.Convert framework.
  21 ///
  22 /// The converter can easily replace boost::lexical_cast, adding flexibility and convenience.
  23
  24 struct boost::cnv::lexical_cast
  25 {
  26     template<typename TypeOut, typename TypeIn>
  27     void
  28     operator()(TypeIn const& value_in, boost::optional<TypeOut>& result_out) const
  29     {
  30         try
  31         {
  32             result_out = boost::lexical_cast<TypeOut>(value_in);
  33         }
  34         catch (boost::bad_lexical_cast const&)
  35         {
  36         }
  37     }
  38 };
  39
  40 #endif // BOOST_CONVERT_LEXICAL_CAST_HPP