• Hasan Aljudy (9/9) Apr 20 2006 Isn't __FILE__ really just a macro? it's processed before tokenizing!
• James Dunne (15/27) Apr 21 2006 __FILE__ is processed (like __LINE__) as a special reserved identifier

Hasan Aljudy <hasan.aljudy gmail.com> writes:

Isn't __FILE__ really just a macro? it's processed before tokenizing! 
according to the specc, if the lexer sees __FILE__ or __LINE__ or such, 
it should convert it to an appropriate string/number/whatever before 
tokenizing it. Hence, it's a macro.

This implies that __FILE__ and such cannot be used in mixins or 
templates to mimic things like the following C macro:

#define log(s) logprintf(__FILE__ ": " __FUNCTION__ ": %s", s)

Shouldn't these things become templates (or something like that) so that 
we can use them like the above C macro, but with D templates?

James Dunne <james.jdunne gmail.com> writes:

Hasan Aljudy wrote:
 Isn't __FILE__ really just a macro? it's processed before tokenizing! 
 according to the specc, if the lexer sees __FILE__ or __LINE__ or such, 
 it should convert it to an appropriate string/number/whatever before 
 tokenizing it. Hence, it's a macro.
 

__FILE__ is processed (like __LINE__) as a special reserved identifier 
which tokenizes to a string representing the current source file being 
tokenized.

It is _not_ processed _before_ tokenization as you say; it is processed 
during tokenization and is converted to an equivalent string-literal token.

 This implies that __FILE__ and such cannot be used in mixins or 
 templates to mimic things like the following C macro:

I'm not sure how you concluded that... Are you asking to which source 
file the __FILE__ reserved identifier represents when using a mixin 
across file boundaries?

 
 #define log(s) logprintf(__FILE__ ": " __FUNCTION__ ": %s", s)
 
 Shouldn't these things become templates (or something like that) so that 
 we can use them like the above C macro, but with D templates?

Perhaps you're hinting at a new set of reserved words like 
__INSTANTIATED_FILE__ and __INSTANTIATED_FUNCTION__ so that they expand 
to the file/line number where the template/mixin is instantiated at?

-- 
Regards,
James Dunne