Re: [boost] Interactive metaprogramming shells

Subject: Re: [boost] Interactive metaprogramming shells
From: Larry Evans (cppljevans_at_[hidden])
Date: 2014-01-26 12:55:00

On 01/26/14 05:21, Abel Sinkovics wrote:
> Hi,
>
> 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
>
> Feedback is welcome.
>
> Regards,
>    Ábel
>
FANTASTIC!

I tried the above example in my ubuntu Konqueror browser and it worked
as expected:

/*
  * Template metaprogramming shell 1.0.0
  * 9f2271f Keep link path at install
  *
  * Metashell Copyright (C) 2013 Abel Sinkovics (abel_at_[hidden])
  * This program comes with ABSOLUTELY NO WARRANTY. This is free 
software, and you are welcome to redistribute it
  * under certain conditions; for details visit 
<http://www.gnu.org/licenses/>.
  *
  * Based on
  *   libclang   Debian clang version 3.2-7ubuntu1 
(tags/RELEASE_32/final) (based on LLVM 3.2)
  *   Boost.Wave 2.3.0.4421 [linux/GNU C++ version 4.8.1]
  *   Readline   6.2
  */

 > #include <boost/mpl/vector.hpp> 

 > #include <boost/mpl/push_front.hpp> 

 > #include <metashell/formatter/vector.hpp> 

 > boost::mpl::push_front<boost::mpl::vector<int, char>, double>::type 

boost_::mpl::vector<double, int, char>
 > 

Thank you very much Abel.

-kind regards,
Larry