Chris@16: //Copyright (c) 2006-2009 Emil Dotchevski and Reverge Studios, Inc.
Chris@16: 
Chris@16: //Distributed under the Boost Software License, Version 1.0. (See accompanying
Chris@16: //file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16: 
Chris@16: #ifndef UUID_7E48761AD92811DC9011477D56D89593
Chris@16: #define UUID_7E48761AD92811DC9011477D56D89593
Chris@16: #if (__GNUC__*100+__GNUC_MINOR__>301) && !defined(BOOST_EXCEPTION_ENABLE_WARNINGS)
Chris@16: #pragma GCC system_header
Chris@16: #endif
Chris@16: #if defined(_MSC_VER) && !defined(BOOST_EXCEPTION_ENABLE_WARNINGS)
Chris@16: #pragma warning(push,1)
Chris@16: #endif
Chris@16: 
Chris@16: #include <boost/utility/enable_if.hpp>
Chris@16: #include <boost/exception/detail/is_output_streamable.hpp>
Chris@16: #include <sstream>
Chris@16: 
Chris@16: namespace
Chris@16: boost
Chris@16:     {
Chris@16:     template <class T,class U>
Chris@16:     std::string to_string( std::pair<T,U> const & );
Chris@16:     std::string to_string( std::exception const & );
Chris@16: 
Chris@16:     namespace
Chris@16:     to_string_detail
Chris@16:         {
Chris@16:         template <class T>
Chris@16:         typename disable_if<is_output_streamable<T>,char>::type to_string( T const & );
Chris@16:         using boost::to_string;
Chris@16: 
Chris@16:         template <class,bool IsOutputStreamable>
Chris@16:         struct has_to_string_impl;
Chris@16: 
Chris@16:         template <class T>
Chris@16:         struct
Chris@16:         has_to_string_impl<T,true>
Chris@16:             {
Chris@16:             enum e { value=1 };
Chris@16:             };
Chris@16: 
Chris@16:         template <class T>
Chris@16:         struct
Chris@16:         has_to_string_impl<T,false>
Chris@16:             {
Chris@16:             static T const & f();
Chris@16:             enum e { value=1!=sizeof(to_string(f())) };
Chris@16:             };
Chris@16:         }
Chris@16: 
Chris@16:     template <class T>
Chris@16:     inline
Chris@16:     typename enable_if<is_output_streamable<T>,std::string>::type
Chris@16:     to_string( T const & x )
Chris@16:         {
Chris@16:         std::ostringstream out;
Chris@16:         out << x;
Chris@16:         return out.str();
Chris@16:         }
Chris@16: 
Chris@16:     template <class T>
Chris@16:     struct
Chris@16:     has_to_string
Chris@16:         {
Chris@16:         enum e { value=to_string_detail::has_to_string_impl<T,is_output_streamable<T>::value>::value };
Chris@16:         };
Chris@16: 
Chris@16:     template <class T,class U>
Chris@16:     inline
Chris@16:     std::string
Chris@16:     to_string( std::pair<T,U> const & x )
Chris@16:         {
Chris@16:         return std::string("(") + to_string(x.first) + ',' + to_string(x.second) + ')';
Chris@16:         }
Chris@16: 
Chris@16:     inline
Chris@16:     std::string
Chris@16:     to_string( std::exception const & x )
Chris@16:         {
Chris@16:         return x.what();
Chris@16:         }
Chris@16:     }
Chris@16: 
Chris@16: #if defined(_MSC_VER) && !defined(BOOST_EXCEPTION_ENABLE_WARNINGS)
Chris@16: #pragma warning(pop)
Chris@16: #endif
Chris@16: #endif