Boost C++ Libraries: Ticket #4494: recursive_directory_iterator throws unexpectedly in the non-throw mode

zsolt.ero@… — Sat, 27 Nov 2010 20:35:22 GMT

After numerous un-answered posts to the boost-users list, finally I found out that not I am the first one with this problem. I clearly think it's not a feature request, it a bug!

If you use a directory iterator, you can make a recursive function for it, and inside this function you can use try-catch, which will work fine. But with recursive_directory_iterator there is no way to use it for example parse a root folder on a Windows PC I found the same experience:

you need to provide a exception handling _inside_ the for loop, for normal errors, like missing, path not found, etc., which can continue within the loop
and one outside, just for the "not accessible" error, which terminates the loop
Even if you do a while... loop with an if {it++} at the end, there is no function which would check if the it++ will work or not. All the is_something passes fine. It's only when the iterating actually happens, that a exception is thrown, which happens outside the for/while loop, thus not possible to catch it inside.

status changed

Beman Dawes — Sat, 04 Dec 2010 13:09:27 GMT

status new → assigned

anonymous — Sat, 31 Aug 2013 15:54:02 GMT

#define HDIR_DEEP_ITERATOR_BASE boost::filesystem::recursive_directory_iterator

class dir_deep_iterator : public HDIR_DEEP_ITERATOR_BASE

{

public:

.....

dir_deep_iterator & operator ++()

{

try

{

return (dir_deep_iterator &)HDIR_DEEP_ITERATOR_BASE::operator ++();

}

catch(...)

{

有些特殊的目录无法打开，比如"System Volume Information"，导致抛出异常

no_push(true);

return (dir_deep_iterator &)HDIR_DEEP_ITERATOR_BASE::operator ++();

}

....

}