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digitalmars.D.learn - anyone knows how to print __FUNCTION__ in D? and __LINE__

reply davidl <davidl 126.com> writes:
in c we can print __FUNCTION__ __LINE__ to indicate where we are. in D how  
to do, couldn't find.....
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Aug 14 2006
next sibling parent reply Oskar Linde <oskar.lindeREM OVEgmail.com> writes:
davidl wrote:

 
 in c we can print __FUNCTION__ __LINE__ to indicate where we are. in D 
 how to do, couldn't find.....
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__LINE__ works in D too. I'm not sure if __FUNCTION__ has much use in D, 
as D lacks macros that could make use of it. (Evaluate it at the place 
of macro expansion).

/Oskar
Aug 14 2006
parent "Jarrett Billingsley" <kb3ctd2 yahoo.com> writes:
"Oskar Linde" <oskar.lindeREM OVEgmail.com> wrote in message 
news:ebpvni$2l64$1 digitaldaemon.com...


 __LINE__ works in D too. I'm not sure if __FUNCTION__ has much use in D, 
 as D lacks macros that could make use of it. (Evaluate it at the place of 
 macro expansion).


In addition, you can find the list of all supported special tokens at 
http://www.digitalmars.com/d/lex.html#specialtokens.
Aug 14 2006
prev sibling next sibling parent BCS <BCS pathlink.com> writes:
davidl wrote:

 
 in c we can print __FUNCTION__ __LINE__ to indicate where we are. in D 
 how  to do, couldn't find.....


I use:

__FILE__":"~itoa!(__LINE__)

writef(...)	// at run time
pragma(msg, ...)// at compile time

Not quite as useful but close.

BTW it requiters the itoa template that can be found about half way down 
this page:
http://www.digitalmars.com/d/templates-revisited.html
Aug 14 2006
prev sibling parent reply renoX <renosky free.fr> writes:
BCS Wrote:

 davidl wrote:

 
 in c we can print __FUNCTION__ __LINE__ to indicate where we are. in D 
 how  to do, couldn't find.....


 I use:
 
 __FILE__":"~itoa!(__LINE__)
 
 writef(...)	// at run time
 pragma(msg, ...)// at compile time
 
 Not quite as useful but close.


I disagree about the 'close' part: in C, you wrap __FILE__ or __LINE__ in a
macro, so you have the value of the call site, in D if you put them in a
default argument or in a template you have the current value, not the call site
which is nearly useless..

So let's not beat around the bush, this is an area where (AFAIK) C is superior
to D..

renoX
Feb 23 2007
parent Bill Baxter <dnewsgroup billbaxter.com> writes:
renoX wrote:

 BCS Wrote:

 davidl wrote:

 in c we can print __FUNCTION__ __LINE__ to indicate where we are. in D 
 how  to do, couldn't find.....


 I use:

 __FILE__":"~itoa!(__LINE__)

 writef(...)	// at run time
 pragma(msg, ...)// at compile time

 Not quite as useful but close.


 
 I disagree about the 'close' part: in C, you wrap __FILE__ or __LINE__ in a
macro, so you have the value of the call site, in D if you put them in a
default argument or in a template you have the current value, not the call site
which is nearly useless..
 
 So let's not beat around the bush, this is an area where (AFAIK) C is superior
to D..
 
 renoX


You can use a mixin statement + new compile-time functions so that this 
syntax is possible:

    mixin( Pr("Error!") );

Pr is a char[]function(char[]) that returns a string like:
   `writefln("%s(%s): %s", __FILE__, __LINE__, msg);`

But of course in C you could define your macro so that you can say just 
Pr("Error!"), without needing the extra mixin( ... ) part.  I think 

something.  Then you could have
     $Pr("Error");

--bb
Feb 23 2007