Subj : Re: How to pass class-member function to pthread_create(....)?
To   : comp.programming.threads
From : Vyacheslav Kononenko
Date : Mon Jul 18 2005 11:24 am



Maciej Sobczak wrote:
> Vyacheslav Kononenko wrote:
>
> > please provide reference in C++ standard wich says how extern "C"
> > linkage affect calling conventions then.
>
> Calling convention has nothing to do about it.
According to link that Chris provided it is the issue:
[While that might work on some platforms, it's not legal C++. The POSIX

standard is a C Language binding, NOT C++. There's no rule that C and
C++
must follow the same calling conventions. In many cases, they do; or at

least it's "close enough" that a C function with a single argument and
a
class member function with no (explicit) arguments are the same.
Counting
on that, though, is just asking for trouble. ]

> 7.5/1:
>
> "Two function types with different language linkages are distinct types
> even if they are otherwise identical."
>
> The problem is that converting a function pointer of type "C++" to the
> function pointer of type "C" is simply illegal - they are different types.

Although function types are different function pointers types are not.
Correct me if I am wrong.

Regards,
Vyacheslav

.