Boost Exception

#if !defined( BOOST_EXCEPTION_DISABLE )
    #include <boost/exception/exception.hpp>
    #include <boost/current_function.hpp>
    #define BOOST_THROW_EXCEPTION(x)\
        ::boost::throw_exception( ::boost::enable_error_info(x) <<\
        ::boost::throw_file(__FILE__) <<\
        ::boost::throw_line((int)__LINE__) )
#else
    #define BOOST_THROW_EXCEPTION(x) ::boost::throw_exception(x)
#endif

namespace
boost
    {
#ifdef BOOST_NO_EXCEPTIONS
    void throw_exception( std::exception const & e ); // user defined
#else
    template <class E>
    void throw_exception( E const & e );
#endif
    }