Re: [boost] Interactive metaprogramming shells

Subject: Re: [boost] Interactive metaprogramming shells
From: Hartmut Kaiser (hartmut.kaiser_at_[hidden])
Date: 2014-01-26 16:24:30

> > 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...

Regards Hartmut
---------------
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