[boost] [iostreams] Patch for mapped_file.cpp.

From: Jurko Gospodnetiæ (jurko.gospodnetic_at_[hidden])
Date: 2008-06-05 08:30:33

   Hi.

   I'm attaching a patch for libs/iostreams/src/mapped_file.cpp which 
corrects the mapped_file_source::operator!() operator.

   It seems to have been erroneously returning true in case the 
implementation object exists but has its error_ flag set.

   Hope this helps.

   Best regards,
     Jurko Gospodnetiæ

Index: libs/iostreams/src/mapped_file.cpp
===================================================================
--- libs/iostreams/src/mapped_file.cpp	(revision 46155)
+++ libs/iostreams/src/mapped_file.cpp	(working copy)
@@ -150,7 +150,7 @@
 }
 
 bool mapped_file_source::operator!() const
-{ return !!pimpl_ || pimpl_->error_; }
+{ return !pimpl_ || pimpl_->error_; }
 
 BOOST_IOS::openmode mapped_file_source::mode() const { return pimpl_->mode_; }