How to use boost::error_info correctly?

Question

I\'m trying to following the examples on this page:

http://www.boost.org/doc/libs/1_40_0/libs/exception/doc/motivation.html

The minute I try the following li

Answer 1

try:

#include 
#include 

throw file_read_error() << boost::errinfo_errno(errno);

even better:

BOOST_THROW_EXCEPTION(file_read_error() << errinfo_errno(errno));

Your HRESULTErrorInfo example seems correct.