Subject:
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Re: thread class for legOS
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Newsgroups:
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lugnet.robotics.rcx.legos
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Date:
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Mon, 21 Jan 2002 15:47:09 GMT
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Viewed:
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1747 times
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On Mon, 21 Jan 2002, Michael J Ash wrote:
> On Mon, 21 Jan 2002, John A. Tamplin wrote:
>
> > No, static doesn't matter but it is possible the calling conventions of C
> > and C++ might be different (I don't know of a platform where that is the
> > case for a an extern function), so you might need to specify C linkage,
> > as in:
>
> Static DOES matter; it declares the method as being a "class" method,
> rather than a normal instance method. I believe there is no implicit
> 'this' parameter and therefore it can be treated like a normal function.
> Of course, it can't be linked with any instance of the class, so you'd
> have to treat it as a wrapper.
Unless you define a function as a member function, there is no this
parameter at all. In the example given, it was not a member function at
all (nor should it be).
I believe you are thinking of a static member function vs. a non-static
member function, in which case you are correct -- a non-static member
function will never work. However, there is no guarantee that C will be
able to call a C++ static member function at all. It may work on many
platforms, but the standard doesn't require it at all (in fact on most
platforms you can probably call a member function by supplying your own
this parameter). There are many things that C++ can do differently, such
as handling exceptions propagated into C code. If you want to write
portable code, you will use C linkage for any code that will be called by
C.
John A. Tamplin jat@jaet.org
770/436-5387 HOME 4116 Manson Ave
770/431-9459 FAX Smyrna, GA 30082-3723
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Message has 1 Reply:
 | | Re: thread class for legOS
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| (...) In the post you replied to saying "static doesn't matter", the proposal was: private: static int runWrapper(...) ; I then replied to your post, etc. Anyway, let's not degenerate into he-said-she-said. We're really just talking past each other (...) (22 years ago, 22-Jan-02, to lugnet.robotics.rcx.legos)
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Message is in Reply To:
| | Re: thread class for legOS
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| (...) Static DOES matter; it declares the method as being a "class" method, rather than a normal instance method. I believe there is no implicit 'this' parameter and therefore it can be treated like a normal function. Of course, it can't be linked (...) (22 years ago, 21-Jan-02, to lugnet.robotics.rcx.legos)
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