//Copyright (c) 2006-2009 Emil Dotchevski and Reverge Studios, Inc.

//Distributed under the Boost Software License, Version 1.0. (See accompanying

//file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

#ifndef UUID_7E48761AD92811DC9011477D56D89593

#define UUID_7E48761AD92811DC9011477D56D89593

#include <boost/utility/enable_if.hpp>

#include <boost/exception/detail/is_output_streamable.hpp>

#include <sstream>

namespace

boost

    {

    namespace

    to_string_detail

        {

        template <class T>

        typename disable_if<is_output_streamable<T>,char>::type to_string( T const & );

        template <class,bool IsOutputStreamable>

        struct has_to_string_impl;

        template <class T>

        struct

        has_to_string_impl<T,true>

            {

            enum e { value=1 };

            };

        template <class T>

        struct

        has_to_string_impl<T,false>

            {

            static T const & f();

            enum e { value=1!=sizeof(to_string(f())) };

            };

        }

    template <class T>

    inline

    typename enable_if<is_output_streamable<T>,std::string>::type

    to_string( T const & x )

        {

        std::ostringstream out;

        out << x;

        return out.str();

        }

    template <class T>

    struct

    has_to_string

        {

        enum e { value=to_string_detail::has_to_string_impl<T,is_output_streamable<T>::value>::value };

        };

    template <class T,class U>

    inline

    std::string

    to_string( std::pair<T,U> const & x )

        {

        return std::string("(") + to_string(x.first) + ',' + to_string(x.second) + ')';

        }

    inline

    std::string

    to_string( std::exception const & x )

        {

        return x.what();

        }

    }

#endif