[Issue 3051] Passing alias to member function does not work (1/2)

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https://issues.dlang.org/show_bug.cgi?id=3051

Dennis  changed:

   What|Removed |Added

 Status|NEW |RESOLVED
 CC||dkor...@live.nl
 Resolution|--- |DUPLICATE

--- Comment #8 from Dennis  ---
It is a bit weird to mark this as a duplicate of an issue filed later, but
since 5710 has been marked as fixed this works too now.

*** This issue has been marked as a duplicate of issue 5710 ***

--

[Issue 3051] Passing alias to member function does not work (1/2)

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https://issues.dlang.org/show_bug.cgi?id=3051

Maksim Zholudev  changed:

   What|Removed |Added

 CC||maxim...@gmail.com

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[Issue 3051] Passing alias to member function does not work (1/2)

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Dicebot  changed:

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--- Comment #7 from Dicebot  2013-08-02 06:09:54 PDT ---
So old and so annoying ;)

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--- Comment #6 from Sobirari Muhomori   2009-06-10 03:30:25 
PDT ---
void foo(delegate void() dg)
{
  dg();
}

class C
{
   int y;
   void fun()
   {
   int x = 0;
   auto me=this;
   void gun()
   { stack.x++; stack.me.y++; }
   foo(&gun); //closure
   }
}

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--- Comment #5 from Steven Schveighoffer   2009-06-05 
08:10:38 PDT ---
(In reply to comment #4)
> In fact, I'm now unsure why that can't work for both these bugs too...

One other thing about having two "this" pointers, how come this can work
(tested with dmd 1.043)?

void foo(delegate void() dg)
{
  dg();
}

class C
{
   int y;
   void fun()
   {
   int x = 0;
   void gun()
   { x++; y++; } // 2 this pointers needed here!
   foo(&gun);
   }
}

So probably there should be no conflict.  And the "this" pointer of the alias'd
function in the bug's example should be statically calculatable, so it doesn't
need to occupy a register.

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--- Comment #4 from Steven Schveighoffer   2009-06-05 
08:00:23 PDT ---
Since the template is instantiated differently for each function that it is
called with, it's entirely possible to "know" the stack frame pointer since it
will be a constant offset from the current stack pointer.  I think that is why
it can work.

In fact, I'm now unsure why that can't work in the other bug too...

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--- Comment #3 from Sobirari Muhomori   2009-06-05 07:36:54 
PDT ---
huh... &fun is a delegate! Does it take stack pointer with all needed
information? Quite hackish, I would say... foreign function messing my stack...
ugh...
So it behaves as nested function, but they are said to access this pointer
through stack, not register.

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--- Comment #2 from Steven Schveighoffer   2009-06-05 
06:17:44 PDT ---
I thought the same as you at first, but I tried this code, and it works:

void fun(alias fx)()
{
fx();
}

void main()
{
int x = 0;
void hun()
{
 x++;
}
fun!(hun)();
writefln("%s", x); // outputs 1
}

So I think Andrei is right, it is probably a conflict of 2 this pointers
required.  The second bug is legit, as it is equivalent to what I wrote here,
but I think this one is invalid (need 2 this pointers).

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--- Comment #1 from Sobirari Muhomori   2009-06-05 05:20:57 
PDT ---
how on earth templates can be parameterized with values unevaluatable at
compile time?

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