I've built interactive shells for preprocessor and template metaprogramming. I've been using them for development and debugging of metaprograms and I think Boost developers could also find them useful.
You can type in (metaprogramming) expressions which get evaluated and the result is displayed immediately. For example you can type
boost::mpl::push_front<boost::mpl::vector<int, char>, double>::type
and you get
boost_::mpl::vector<double, int, char>
as the result (the boost_ namespace is used because there are some tricks there to make the output more readable).
As an example for the preprocessor shell you can type
BOOST_PP_REPEAT(3, foo BOOST_PP_TUPLE_EAT(3), ~)
and you get
foo foo foo
as the result.
The tools are based on the Boost.Wave library and Clang. You can get them here: Preshell for preprocessor: https://github.com/sabel83/preshell Metashell for template metaprograms: https://github.com/sabel83/metashell
You can also try them from your browser here: http://abel.web.elte.hu/shell
That's nice tools! However, the wave tool itself already supports a REPL interface for preprocessing, just start it without arguments...
Is there any documentation for this interface ? I could not find anything about it in "The Wave Driver" documentation.
What documentation would you like to see? It's as simple as starting the driver without command line arguments. Regards Hartmut --------------- http://boost-spirit.com http://stellar.cct.lsu.edu