[preprocessor] using __FILE__ with BOOST_PP_FILENAME_x
Hi all, Please take a look as this trivial example of file iteration: // trivial.h #if !BOOST_PP_IS_ITERATING #ifndef TRIVIAL_H #define TRIVIAL_H #include <boost/preprocessor/iteration/iterate.hpp> #define BOOST_PP_FILENAME_1 "trivial.h" //!!! #define BOOST_PP_ITERATION_LIMITS (1, 3) ??=include BOOST_PP_ITERATE() #endif // TRIVIAL_H #else BOOST_PP_ITERATION() #endif Perhaps not so obvious many (wasn't to me), that #define BOOST_PP_FILENAME_1 __FILE__ doesn't work. One has to specify (kind of like hardcode) the file's name in there.. Is there some, possibly contrived, way to achieve automation of this? regards, - Levent PS: What an AMAZING library this Boost.Preprocessor is!? -- Server Levent Yilmaz Mechanical Engineering University of Pittsburgh
Server Levent Yilmaz wrote:
Hi all,
Please take a look as this trivial example of file iteration:
[... code]
Perhaps not so obvious many (wasn't to me), that
#define BOOST_PP_FILENAME_1 __FILE__
doesn't work.
Yes, because it /always/ expands to the current file (also in the file loaded with #include BOOST_PP_ITERATE()).
One has to specify (kind of like hardcode) the file's name in there.. Is there some, possibly contrived, way to achieve automation of this?
#include <boost/preprocessor/slot/slot.hpp> #define MIN 0 #define MAX 9 #ifndef RESET_DONE # define BOOST_PP_VALUE MIN # include BOOST_PP_ASSIGN_SLOT(1) # define RESET_DONE #endif ***** * BOOST_PP_SLOT(1) * ***** #if BOOST_PP_SLOT(1) < MAX # define BOOST_PP_VALUE BOOST_PP_SLOT(1)+1 # include BOOST_PP_ASSIGN_SLOT(1) # include __FILE__ #else # undef RESET_DONE #endif Please note this code has several limitations, however: 1. The #include __FILE__ part is not handled correctly by all preprocessors. 2. You might want to partially unroll the iteration not to hit internal limits too easily.
PS: What an AMAZING library this Boost.Preprocessor is!?
See its successor to be SHOCKED :-) http://sf.net/projects/chaos-pp Regards, Tobias
On 10/6/07, Tobias Schwinger <tschwinger@isonews2.com> wrote:
Server Levent Yilmaz wrote:
Hi all,
Please take a look as this trivial example of file iteration:
[... code]
Perhaps not so obvious many (wasn't to me), that
#define BOOST_PP_FILENAME_1 __FILE__
doesn't work.
Yes, because it /always/ expands to the current file (also in the file loaded with #include BOOST_PP_ITERATE()).
One has to specify (kind of like hardcode) the file's name in there.. Is there some, possibly contrived, way to achieve automation of this?
#include <boost/preprocessor/slot/slot.hpp>
#define MIN 0 #define MAX 9
#ifndef RESET_DONE # define BOOST_PP_VALUE MIN # include BOOST_PP_ASSIGN_SLOT(1) # define RESET_DONE #endif
***** * BOOST_PP_SLOT(1) * *****
#if BOOST_PP_SLOT(1) < MAX # define BOOST_PP_VALUE BOOST_PP_SLOT(1)+1 # include BOOST_PP_ASSIGN_SLOT(1) # include __FILE__ #else # undef RESET_DONE #endif
Please note this code has several limitations, however:
1. The #include __FILE__ part is not handled correctly by all preprocessors.
2. You might want to partially unroll the iteration not to hit internal limits too easily.
Hey thanks Tobias, I can count on u as usual. I'll try these.. Though hardcoding filename doesn't look so bad now out of a sudden :)
PS: What an AMAZING library this Boost.Preprocessor is!?
See its successor to be SHOCKED :-)
thnx there for the the pointer.. It certainly does look shocking! Though, it isn't exactly user-ready yet is it? How should I go about building the docs? How long has it been around? Why is it chaos, not boost? too many questions, sorry. aborting... ~levent()
participants (3)
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Server Levent Yilmaz -
Tobias Schwinger