namespace
boost
{
class
exception
{
protected:
exception();
exception( exception const & x );
~exception();
};
template <class Tag,class T>
class error_info;
typedef error_info<struct throw_function_,char const *> throw_function;
typedef error_info<struct throw_file_,char const *> throw_file;
typedef error_info<struct throw_line_,int> throw_line;
}