Sam Partington wrote:
On Fri, 20 Feb 2004 16:09:56 -0500, David Abrahams <dave@boost-consulting.com> wrote:
There are pre-generated headers in boost/mpl/aux_/preprocessed/... Those are the ones that actually get used.
What generates these files? We use the preprocessor library for boiler plate code here and there and find it very useful.
But one of the critisms voiced is that debugging the generated code is difficult->impossible (all debug info points at the same line in the code!). What we really want is a way of preprocessing the code as a separate stage in the build process.
We could (and occasionally do) output the preprocessed files, but that means all of the headers are pulled in, and all of the comments stripped out.
If you need or would like to debug your preprocessing code you may want to have a look at the tracing capabilities provided by the Wave preprocessor. It allows you to get a very dedicated macro expansion trace of a certain macro, which allows to track down nasty pp problems (and BTW is very educational, what actually is going on inside the Boost.PP library). Regards Hartmut