hey im curious, are there any facilities in d for expanding macros beyond a mixin? for example what if i want to pass the source location into a function, for example:

in c/c++ i could write a method:

_someMethod( int line, string source );

then macro:

#define someMethod()	_someMethod( _LINE_, _FILE_ );

etc..


how would you do something like this in D ?

"J Thomas" <jtd514@ameritech.net> wrote in message news:dc7clf$26s3$1@digitaldaemon.com...
> hey im curious, are there any facilities in d for expanding macros beyond a mixin? for example what if i want to pass the source location into a function, for example:
>
> in c/c++ i could write a method:
>
> _someMethod( int line, string source );
>
> then macro:
>
> #define someMethod() _someMethod( _LINE_, _FILE_ );
>
> etc..
>
>
> how would you do something like this in D ?

You'd have to expand the macro by hand. In D __LINE__ and __FILE__ are substituted at the lexer level - so the rest of the parser never knows they exist.

yah thats what i was thinking, bummer...

i love D but im still not completely sold on the no preprocessor


Ben Hinkle wrote:
> "J Thomas" <jtd514@ameritech.net> wrote in message news:dc7clf$26s3$1@digitaldaemon.com...
> 
>>hey im curious, are there any facilities in d for expanding macros beyond a mixin? for example what if i want to pass the source location into a function, for example:
>>
>>in c/c++ i could write a method:
>>
>>_someMethod( int line, string source );
>>
>>then macro:
>>
>>#define someMethod() _someMethod( _LINE_, _FILE_ );
>>
>>etc..
>>
>>
>>how would you do something like this in D ?
> 
> 
> You'd have to expand the macro by hand. In D __LINE__ and __FILE__ are substituted at the lexer level - so the rest of the parser never knows they exist. 
> 
> 

You can always run it through a C++ pre-proccessor before compilation.

Charlie
"J Thomas" <jtd514@ameritech.net> wrote in message
news:dc8hvi$d5c$1@digitaldaemon.com...
> yah thats what i was thinking, bummer...
>
> i love D but im still not completely sold on the no preprocessor
>
>
> Ben Hinkle wrote:
> > "J Thomas" <jtd514@ameritech.net> wrote in message news:dc7clf$26s3$1@digitaldaemon.com...
> >
> >>hey im curious, are there any facilities in d for expanding macros
beyond
> >>a mixin? for example what if i want to pass the source location into a function, for example:
> >>
> >>in c/c++ i could write a method:
> >>
> >>_someMethod( int line, string source );
> >>
> >>then macro:
> >>
> >>#define someMethod() _someMethod( _LINE_, _FILE_ );
> >>
> >>etc..
> >>
> >>
> >>how would you do something like this in D ?
> >
> >
> > You'd have to expand the macro by hand. In D __LINE__ and __FILE__ are substituted at the lexer level - so the rest of the parser never knows
they
> > exist.
> >
> >

"Charles" <noone@nowhere.com> wrote:

> You can always run it through a C++ pre-proccessor before compilation.
[...]

That is definitely not true, because pre-processor directives might be included in D-strings spanning several lines.

-manfred