Are there some tips to find useless header files?

Are there some tips to find useless header files?

[gan_xiao_jun]

Are there some tips(script or command lines) to find
useless header files in c or cpp files?

For example:
vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
#include <useful1.h>
...
#include <useless.h>//<===how to find it by script
...
#include <useful2.h>

main()
{
...
}
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Thanks in advance
gan


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Re: Are there some tips to find useless header files?

[Eljay Love-Jensen]

Hi gan,

>Are there some tips(script or command lines) to find useless header files in c or cpp files?

Interesting challenge!

I recommend using Perl to parse the header files specified in your C++ source file, and maintain a set of the identifiers declared (including #define'd) in that header file.  Note:  your choice whether or not to dive into header files included by header files (i.e., header files included indirectly).

Then make a map of all the identifiers in your C++ source file.

Then have Perl "check off" each one of those identifiers in your C++ source file, and note which header file it came from (thus marking that header files as "useful").

When finished, print a list of all the header files that are not marked as "useful".

And maybe also print a list of all identifiers that are orphans in your source file.  Might be indicative of a missing header file, or a header file that was included indirectly.

Voila!

HTH,
--Eljay

Re: Are there some tips to find useless header files?

[Lionel B]

<gan_xiao_jun@yahoo.com> wrote in message news:20050521160448.54635.qmail@web53907.mail.yahoo.com...
> Are there some tips(script or command lines) to find
> useless header files in c or cpp files?

I recall there was an interesting (if inconclusive) thread on this in comp.lang.c++ recently:

http://groups-beta.google.com/group/comp.lang.c++/browse_frm/thread/3f5cad33e4c765a5/87525506d2f11c25

-- 
Lionel B