"Peter Dimov" <pdimov@pdimov.com> wrote in message news:01bf01c81a67$bc9ae2c0$6407a80a@pdimov2...
The current registration interface requires me to #include <boost/typeof.hpp>, then #include BOOST_TYPEOF_SOMETHING(), then use a macro. These headers in turn include MPL headers, PP headers and who knows what else.
I'm saying that if the registration interface did not require me to include any header, then I'd be willing to register all my types and templates at the point of their definition.
Rather than registering your types and templates at their point of definition, I think it's better to put them in a separate header file. That header file is only needed by a user whose compiler doesn't provide a native typeof operator or an exploit of a compiler bug to discover types. So far, we've been lucky (and smart) enough to discover MSVC bugs that eliminate the need for typeof registrations on those compilers. But if Microsoft were to fix the bug in a service pack, we'd be SOL without type registrations. So why not have each library create a file in $BOOST_ROOT/boost/typeof_registrations named "MyLibrary_typeof.hpp". The file would (1) include the <boost/typeof/typeof.hpp> header, (2) include the <boost/typeof_registrations/OtherLibrary_typeof.hpp> files for libraries that it uses and (3) specify all of its own type and template registrations.