On Tue, Oct 21, 2008 at 10:18 PM, Eric Niebler <eric@boost-consulting.com> wrote:
Emil Dotchevski wrote:
#include "boost/throw_exception.hpp"
struct my_exception: std::exception { };
BOOST_THROW_EXCEPTION(my_exception());
It automatically records the throw location in the exception object. At the catch site, you can use boost::diagnostic_information to get a string that includes the throw location:
#include "boost/exception/diagnostic_information.hpp"
catch( my_exception & e ) { std::cerr << boost::diagnostic_information(e); }
When I try this (on trunk) I get:
1>.\main.cpp(93) : error C2664: 'boost::diagnostic_information' : cannot convert parameter 1 from 'my_exception' to 'const boost::exception &' 1> Reason: cannot convert from 'my_exception' to 'const boost::exception' 1> No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called
Ah right, my mistake. As Alp suggested deriving from boost::exception would work, though you should always derive from std::exception as well, since this is a requirement of boost::throw_exception (which BOOST_THROW_EXCEPTION calls after recording throw location information in the exception.) The other possibility is to not derive from boost::exception but dynamic_cast to it once you catch my_exception: catch( my_exception & e ) { if( boost::exception * be=dynamic_cast<boost::exception *>(&e) ) std::cerr << boost::diagnostic_information(*be); else std::cerr << e.what(); } Emil Dotchevski Reverge Studios, Inc. http://www.revergestudios.com/reblog/index.php?n=ReCode