Tomas Lindquist Olsen <tomas famolsen.dk> writes:

I'm trying to compile a pretty simple C-style variadic function.

extern(C)
void error(char* fmt, ...)
{
        vprintf(fmt, _argptr);
}

This gives the error:
Error: undefined identifier _argptr

According to http://digitalmars.com/d/function.html this should at least
compile.

Whats up?

jcc7 <technocrat7 gmail.com> writes:

== Quote from Tomas Lindquist Olsen (tomas famolsen.dk)'s article
 I'm trying to compile a pretty simple C-style variadic function.
 extern(C)
 void error(char* fmt, ...)
 {
         vprintf(fmt, _argptr);
 }
 This gives the error:
 Error: undefined identifier _argptr
 According to http://digitalmars.com/d/function.html this should at least
 compile.
 Whats up?

I couldn't get your code to work either, but the following code seems to work
(tested with DMD 1.0):

import std.stdio;

void foo(...)
{
    writefln("\t%s", _argptr);
}


void main()
{
    foo(1, 2, 3L, 4.5, 7F, "my str");
}


A longer example is at:
http://www.dsource.org/projects/tutorials/wiki/VariableArgumentsUsingStdStdargExample

Tomas Lindquist Olsen <tomas famolsen.dk> writes:

jcc7 wrote:

 == Quote from Tomas Lindquist Olsen (tomas famolsen.dk)'s article
 I'm trying to compile a pretty simple C-style variadic function.
 extern(C)
 void error(char* fmt, ...)
 {
         vprintf(fmt, _argptr);
 }
 This gives the error:
 Error: undefined identifier _argptr
 According to http://digitalmars.com/d/function.html this should at least
 compile.
 Whats up?

 
 I couldn't get your code to work either, but the following code seems to
 work (tested with DMD 1.0):
 
 import std.stdio;
 
 void foo(...)
 {
     writefln("\t%s", _argptr);
 }
 
 
 void main()
 {
     foo(1, 2, 3L, 4.5, 7F, "my str");
 }
 
 
 A longer example is at:

http://www.dsource.org/projects/tutorials/wiki/VariableArgumentsUsingStdStdargExample

This is clearly a bug, so I filed it:
http://d.puremagic.com/issues/show_bug.cgi?id=937

Bill Baxter <dnewsgroup billbaxter.com> writes:

Tomas Lindquist Olsen wrote:
 I'm trying to compile a pretty simple C-style variadic function.
 
 extern(C)
 void error(char* fmt, ...)
 {
         vprintf(fmt, _argptr);
 }
 
 This gives the error:
 Error: undefined identifier _argptr
 
 According to http://digitalmars.com/d/function.html this should at least
 compile.
 
 Whats up?

<rant mode="feel free to ignore>
Ugh, I wish _argptr/_arguments would go away completely.
There has to be a better way to handle variable numbers of arguments ... 
oh wait! there is!  You specify a *name* for the argument list, kinda 
like how the other variadic arguments work in D, the ones for templates.

_argptr/_arguments just look like a quick hack.  By far the most hackish 
looking thing in all of D.
</rant>

--bb

Tomas Lindquist Olsen <tomas famolsen.dk> writes:

Bill Baxter wrote:
 
 _argptr/_arguments just look like a quick hack.  By far the most hackish
 looking thing in all of D.
 </rant>
 
 --bb

I agree.
It would still be nice if it worked according to spec though.

Lionello Lunesu <lio lunesu.remove.com> writes:

Tomas Lindquist Olsen wrote:
 I'm trying to compile a pretty simple C-style variadic function.
 
 extern(C)
 void error(char* fmt, ...)
 {
         vprintf(fmt, _argptr);
 }
 
 This gives the error:
 Error: undefined identifier _argptr
 
 According to http://digitalmars.com/d/function.html this should at least
 compile.
 
 Whats up?

You need std.c.stdarg for C functions.

L.

Tomas Lindquist Olsen <tomas famolsen.dk> writes:

Lionello Lunesu wrote:
 You need std.c.stdarg for C functions.
 
 L.

Not according to the spec.