[boost] Re: File-Iteration

From: Aleksey Gurtovoy (agurtovoy_at_[hidden])
Date: 2002-06-19 20:52:45

Paul Mensonides wrote:
> // file.hpp
> #if !defined(BOOST_PP_IS_ITERATING)
> 
>     #ifndef FILE_HPP // normal file begins here
>     #define FILE_HPP
> 
>         #include <boost/preprocessor/comma_if.hpp>
>         #include <boost/preprocessor/iterate.hpp>
>         #include <boost/preprocessor/repeat.hpp>
> 
>         template<int> struct test; // no def
>         template<> struct test<0>; // no def
> 
>         #define BOOST_PP_BOUND 1
>         #include BOOST_PP_SET_LBOUND()
> 
>         #define BOOST_PP_BOUND 100
>         #include BOOST_PP_SET_UBOUND()
> 
>         #define BOOST_PP_FILENAME_1 "file.hpp"
>         #include BOOST_PP_ITERATE()
> 
>     #endif // end of normal file
> 
> #else // this part get iterated over
>     #line BOOST_PP_LINE(__LINE__, file.hpp) // for debugging
>     #define C BOOST_PP_FILE_ARG() // temporary
> 
>     #define ABC(n, nil) BOOST_PP_COMMA_IF(n) class T ## n
> 
>     template<> struct test<C> {
>         template<BOOST_PP_REPEAT(C, ABC, nil)>
>         struct args { /* whatever */ };
>     };
> 
>     #undef ABC
>     #undef C
> #endif

Cool! Is second-level recursion possible?

Aleksey