Yo,
I had a job interview today, the interviewing asked me about
inline virtual functions, or what was my opinion on them.
Hm, I've seen mention of these babies in the reference material,
but I've never used one. ( I'm an experienced software developer
and have used C++ for more than 10 years)
Anybody found the use of one of these guys necessary or useful.
Curious minds need to know for the next curve ball question coming my
way....!
thanks, dave
Jul 22 '05
15  10643 
John Carson wrote: ...
I had a job interview today, the interviewing asked me about
inline virtual functions, or what was my opinion on them.
Hm, I've seen mention of these babies in the reference material,
but I've never used one. ( I'm an experienced software developer
and have used C++ for more than 10 years)
...
I think this was a trick question. Virtual function calls are only resolved
at runtime and cannot be inlined.
"Inline function" and "inlined function call" are two different and
relatively independent things in C++. The same applies to "virtual
function" and "virtual (dynamically resolved) function call".
The question specifically mentions "inline virtual functions" and make
no reference to function calls whatsoever. Formally, there's absolutely
nothing tricky about it.
--
Best regards,
Andrey Tarasevich
Risto Lankinen wrote:
Also remember that the inline function-specifier (implicit or explicit)
is only a recommendation.
See 7.1.2.
However, inline has a second meaning as a linkage directive!
If you define a function in a header file (not a practice I would
recommend, but for the sake of argument), then only one file
in a multiple source file project may include that header, unless
the definition is tagged as inline. Failing to do that, ambiguities
in name resolution will emerge at link time.
...
Exactly. The same can be said about 'virtual'. It also has several
second meanings only loosely related to dynamically resolving function
calls.
When answering such questions, it is very important to understand the
difference between the properties of functions and the properties of
concrete function calls. Unfortunately, in many cases these two got
mixed together, which can only lead to confusion.
--
Best regards,
Andrey Tarasevich
"Andrey Tarasevich" <an************ **@hotmail.com> wrote in message
news:10******** *****@news.supe rnews.com John Carson wrote: ...
I had a job interview today, the interviewing asked me about
inline virtual functions, or what was my opinion on them.
Hm, I've seen mention of these babies in the reference material,
but I've never used one. ( I'm an experienced software developer
and have used C++ for more than 10 years)
...
I think this was a trick question. Virtual function calls are only
resolved at runtime and cannot be inlined.
"Inline function" and "inlined function call" are two different and
relatively independent things in C++. The same applies to "virtual
function" and "virtual (dynamically resolved) function call".
The question specifically mentions "inline virtual functions" and make
no reference to function calls whatsoever. Formally, there's
absolutely nothing tricky about it.
We don't have the text of the interview question, just a paraphrase of it.
As I commented in response to Alf, I cannot think why the interviewer would
single out virtual functions for special mention unless (s)he was thinking
of the special inlining rules applicable to them.
--
John Carson
1. To reply to email address, remove donald
2. Don't reply to email address (post here instead)
"Alf P. Steinbach" <al***@start.no > wrote in message
news:40******** ********@news.i ndividual.net
And why do you think that the interviewer bothered to single out
inline virtual functions as opposed to inline functions in general?
The only reason that I can think of is because the rules for
inlining are different.
It was an open question.
But not open enough to permit a discussion of inlining?
--
John Carson
1. To reply to email address, remove donald
2. Don't reply to email address (post here instead)
"Andrey Tarasevich" <an************ **@hotmail.com> wrote in message
news:10******** *****@news.supe rnews.com Risto Lankinen wrote:
Also remember that the inline function-specifier (implicit or
explicit) is only a recommendation.
See 7.1.2.
However, inline has a second meaning as a linkage directive!
If you define a function in a header file (not a practice I would
recommend, but for the sake of argument), then only one file
in a multiple source file project may include that header, unless
the definition is tagged as inline. Failing to do that, ambiguities
in name resolution will emerge at link time.
...
Exactly. The same can be said about 'virtual'. It also has several
second meanings only loosely related to dynamically resolving function
calls.
When answering such questions, it is very important to understand the
difference between the properties of functions and the properties of
concrete function calls.
I would consider the former to be the union of the latter (and of the syntax
for declaring and defining the functions).
--
John Carson
1. To reply to email address, remove donald
2. Don't reply to email address (post here instead)
* "John Carson" <do***********@ datafast.net.au > schriebt: "Alf P. Steinbach" <al***@start.no > wrote in message
news:40******** ********@news.i ndividual.net
And why do you think that the interviewer bothered to single out
inline virtual functions as opposed to inline functions in general?
The only reason that I can think of is because the rules for
inlining are different.
It was an open question.
But not open enough to permit a discussion of inlining?
Oh, it is.
That too.
An open question can tell much.
--
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
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