[iostreams][trunk] patch for msvc 7.1 error

The following patch fixes the mapped_file_test compilation error for 
msvc 7.1 (daw-msvc71):

Index: libs/iostreams/src/mapped_file.cpp
===================================================================
--- libs/iostreams/src/mapped_file.cpp  (revision 48407)
+++ libs/iostreams/src/mapped_file.cpp  (working copy)
@@ -434,7 +434,7 @@

  void mapped_file_source::close() { pimpl_->close(); }

-mapped_file_source::operator safe_bool() const
+mapped_file_source::operator mapped_file_source::safe_bool() const
  { return pimpl_->error() ? &safe_bool_helper::x : 0; }

  bool mapped_file_source::operator!() const

David

PS Is this the right place to post patches?  Should I use Trac instead?

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