Eric Niebler wrote:
if( ScopedLock l = try_lock( m ) ) { }
where try_lock is function that returns a simple wrapper class:
I prefer ScopedGuard-like implementation because it doesn't introduce neither new try_lock function nor its return type (return type is somewhat similar to lock class for new users yet is very different from the lock because, for example, it's CopyConstructible => source of confusion). If the code above were based on that idiom, try_lock/timed_lock/whatever_lock classes could be "reused". On the one hand, they could be used for standalone guards, on the other hand, it could be possible to compile your code. Of course, ScopedLock has to be const reference to some base class of all lock classes. http://lists.boost.org/MailArchives/boost/msg49847.php -- Alexander Nasonov