type mismatch of buffer size parameter causes overload resolution to fail

[Jonathan Turkanis]

See ​http://article.gmane.org/gmane.comp.lib.boost.user/33728.

Change documentation so that buffer size parameters have type int, or disable forwarding constructors when first parameter matches device type and second parameter is integral

[Jonathan Turkanis]

I have disabled the forwarding constructors and open() overloads in detail/forward.hpp when the first template parameter is identical to the underlying device type. This is a little too broad, since it fails to check whether the remaining parameters are integral; I judged that device constructors whose first parameter is an instance of the device itself would be pretty rare.

I was able to reproduce the error with VC8.0 on a 32-bit OS with this code:

typedef stream<file_source> my_stream; my_stream s(file_source(""), (long) 100);

The modification to forward.hpp allows the above to compile.

See [46047]