From mboxrd@z Thu Jan  1 00:00:00 1970
From: ratheesh kannoth <ratheesh.ksz@gmail.com>
Subject: Re: macro to print filename
Date: Thu, 2 Jun 2011 23:41:05 +0530
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To: Zhongye Jia <jia.zhongye@gmail.com>
Cc: Michal Nazarewicz <mina86@mina86.com>, linux-c-programming@vger.kernel.org

On Thu, Jun 2, 2011 at 7:09 PM, Zhongye Jia <jia.zhongye@gmail.com> wro=
te:
> thanks very much! it works very well only except that the
> initialization should be placed out of the struct. the compiling time
> computation in c++ is really amazing.
>
> 2011/6/2 Michal Nazarewicz <mina86@mina86.com>:
>> On Wed, 01 Jun 2011 20:45:06 +0200, Zhongye Jia <jia.zhongye@gmail.c=
om>
>> wrote:
>>>
>>> I do not think this can be done in *compiling* time, neither macro =
in
>>> c nor template in c++, so would you be so kind to offer the solutio=
n
>>> by using template or just give =A0some tips? Since I'm not that goo=
d at
>>> c++ :)
>>
>> I was thinking along the lines of:
>>
>> template<unsigned offset>
>> struct _filename {
>> =A0 =A0 =A0 =A0static const char *const val =3D __FILE__[offset] =3D=
=3D '/'
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0? __FILE__ + offset + 1
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0: _filename<offset-1>::val;
>> };
>>
>> template<>
>> struct _filename<0> {
>> =A0 =A0 =A0 =A0static const char *const val =3D __FILE__;
>> };
>>
>> static const char *const filename =3D _filename<sizeof(__FILE__) - 1=
>;
>>
>> I'm a bit rusty so I dunno if that'll work in this format.
>>
>> --
>> Best regards, =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0=
 =A0 =A0 =A0 =A0 =A0 =A0 _ =A0 =A0 _
>> .o. | Liege of Serenely Enlightened Majesty of =A0 =A0 =A0o' \,=3D./=
 `o
>> ..o | Computer Science, =A0Michal "mina86" Nazarewicz =A0 =A0(o o)
>> ooo +-----<email/xmpp: mnazarewicz@google.com>-----ooO--(_)--Ooo--
>>
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>

This is nice one.

so we could use __FILE__ with Makefile to solve this problem. We could
 use __FILE__  in our program and define Makefile for each directory.
=46rom toplevel directory, call using - make -C subdir/ . This will giv=
e
help __FILE__ macro to exapand to just filename since "make" is
executing inside the directory.

-Ratheesh
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