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Kurt Krueckeberg
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 Posted: Fri Jun 27, 2003 4:48 pm Post subject: Re: pointers to functions and pointers to static member func |
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| Quote: | Hello,
can I use pointers to functions and pointers to static member
functions (with same argument and return types) interchangebly?
I thing I've found ansswer in the C++ standard (in [5.2.2]), but I am
not sure that I interpret it correctly - I would prefer more direct
statement and I could not find one.
Thanks,
Michael Furman
static member function pointers are not the same type as class member |
function pointers.
class Sample {
public:
static int StaticThatReturnsInt();
int MemberThatReturnsInt();
};
typedef int (*pIntFunc)();
typedef int (Sample::*pSampleIntFunc)();
//. . .
pIntFunc pf = &Sample::StaticThatReturnsInt;
pSampleIntFunc psf = &Sample::MemberThatReturnsInt;
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Michael Furman
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| Posted: Sat Jun 28, 2003 12:33 pm Post subject: Re: pointers to functions and pointers to static member func |
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"Maciej Sobczak" <maciej (AT) maciejsobczak (DOT) com> wrote
| Quote: | Hi,
Michael Furman wrote:
[...]
I thing I've found answer in the C++ standard (in [5.2.2]), but I am
not sure that I interpret it correctly - I would prefer more direct
statement and I could not find one.
"A static member function is an ordinary function." - this footnote, in
the context of postfix function call expression, is enough. It means
that if you have a pointer to function, you can use it to store
addresses of normal functions as well as static member functions.
[...]
That is exactly what I have found myself (footnote in [5.2.2]) I hoped |
that there is more direct wording in the main text.
Thanks,
Michael Furman
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Michael Furman
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| Posted: Sat Jun 28, 2003 12:36 pm Post subject: Re: pointers to functions and pointers to static member func |
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"Daniel Spangenberg" <dsp (AT) bdal (DOT) de> wrote
| Quote: | Hello Michael Furman!
Michael Furman schrieb:
Hello,
can I use pointers to functions and pointers to static member
functions (with same argument and return types) interchangebly?
I thing I've found ansswer in the C++ standard (in [5.2.2]), but I am
not sure that I interpret it correctly - I would prefer more direct
statement and I could not find one.
Thanks,
Michael Furman
Your statement is somewhat misleading. There does not exist a special
type of pointer to static member functions. But you can always take a
normal function pointer to a static member function, provided that you
don't need a function pointer with linkage specification different from
extern "C++" (See 7.5).
|
Can you explain what is misleading? (I guess I should add "and same
linkage").
I've found only one footnote in [5.2.2] and asking is there more direct
words
in the Standard.
Thanks,
Michael Furman
[ See http://www.gotw.ca/resources/clcm.htm for info about ]
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Daniel Spangenberg
Guest
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| Posted: Mon Jun 30, 2003 5:39 pm Post subject: Re: pointers to functions and pointers to static member func |
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Hello, Michael!
Michael Furman schrieb:
| Quote: | Your statement is somewhat misleading. There does not exist a
special
type of pointer to static member functions. But you can always take
a
normal function pointer to a static member function, provided that
you
don't need a function pointer with linkage specification different
from
extern "C++" (See 7.5).
Can you explain what is misleading? (I guess I should add "and same
linkage").
I've found only one footnote in [5.2.2] and asking is there more
direct
words
in the Standard.
Thanks,
Michael Furman
|
Sorry for the confusion. My **introductory** sentence was simply
bullsh...
and *it* was the one and only misleading thing. I hope you accept my
apology for this.
Fortunately, this did not have any influence on the remainder of my
posting....
I also think, that Our Holy Standard is somewhat stingy concerning its
explanations of static member functions. The linkage stuff is explained
loosely in 3.5/5 and 7.5, and 9.3 and 9.4 clarify not too much.
Some indirect conclusion can be drawn from 3.9.2:
"- pointers to void or objects or functions (including static members of
classes)
of a given type, 8.3.1;"
while 8.3.3 excludes pointer to static members of a class.
The most direct sentence I could find was in 13.4/3:
"Nonmember functions and static member functions match targets of type
"pointer-to-function"
or "reference-to-function.""
Greetings from Bremen,
Daniel
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