Code fails with linker error. Why?

[ketmar via Digitalmars-d-learn]

On Sat, 04 Oct 2014 11:01:28 +0000
John Colvin via Digitalmars-d-learn <digitalmars-d-learn at puremagic.com>
wrote:

> On Saturday, 4 October 2014 at 10:38:32 UTC, ketmar via 
> Digitalmars-d-learn wrote:
> > On Sat, 04 Oct 2014 10:27:16 +0000
> > John Colvin via Digitalmars-d-learn 
> > <digitalmars-d-learn at puremagic.com>
> > wrote:
> >
> >> Sorry, but that's just not how it works. There is no 
> >> requirement for the definition of a function to be found in 
> >> the same compilation unit as it's declaration.
> > is there any possibility to declare *class* *method* in one 
> > file and to
> > implement it in another? O_O
> >
> > i doubt so.
> 
> Yes, you can. You just have to get the mangling right.
and how about access to class fields? manual mangling is a half-working
hack. alas. i really want to have some normal and non-hackish way to
separate class definition and class implementation. besides, your trick
is faulty, 'cause it misses hidden 'this' parameter. try that:

  // methodLink.d
  class A { void foo(int n); }
  void main () { auto a = new A; a.foo(42); }

  // missingMethod.d
  import methodLink;
  import std.stdio;

  pragma(mangle, A.foo.mangleof)
  void foo(int n) { writeln("n=", n); }

it writes gibberish and segfaults.
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