Re: [boost] Preprocessor Library

From: David Abrahams (david.abrahams_at_[hidden])
Date: 2002-04-10 14:28:34

----- Original Message -----
From: "Paul Mensonides" <pmenso57_at_[hidden]>

> > 1. I need to pre-generate a large number of repetitions for most EDG
> > compilers, which it seems basically can't handle any PP lib
constructs,
> > making me wonder how much the PP lib is really buying me.
>
> David, it helps significantly every time you get rid of one 'level' of
> recursion.

Sorry, I'm not good at divining the meaning of uncommented code. Could
you please tell me what you're trying to illustrate below?

> // make.h
>
> #ifndef UPPER_BOUND
> #error UPPER_BOUND is not set
> #endif
>
> #ifndef LOWER_BOUND
> #define LOWER_BOUND 1
> #endif
>
> #define IS_RANGE(N) LOWER_BOUND <= N && UPPER_BOUND >= N
>
> #if RANGE(0)
>     MACRO(0)
> #endif
> #if RANGE(1)
>     MACRO(1)
> #endif
> #if RANGE(2)
>     MACRO(2)
> #endif
> // etc.
>
> // sample.h
>
> #define LOWER_BOUND 0
> #define UPPER_BOUND 15
>
> #define AUX_MY_CONSTRUCT_GET(i) \
>     template< BOOST_MY_LIBRARY_PP_PARAMS(i, typename T) > \
>     struct my_construct { /* more stuff */ }; \
>     /**/
>
> #define MACRO AUX_MY_CONSTRUCT_GET
>
> #include "make.h"
>
> #undef LOWER_BOUND
> #undef UPPER_BOUND
> #undef AUX_MY_CONSTRUCT_GET
> #undef MACRO
>
> Paul Mensonides