Re: slightly interresting derrived class problem
* easy:
I start off with an interface class that has no data members and a
handful of virtual functions.
First Question: is that allowed ?
Yes.
I then derived from this class and it gets included into a couple of
other classes that need that interface. The derived class had a number
of data members including a struct that allow it to do its dirty work.
When I directly access any data members (through pointers or through
public data members) in the derrived class hilarity ensues. I found
that the value returned is offset by 4 bytes( 32bits ).
for example, if I wanted:
class1.public_struct.int0
I would get
class1.public_struct.int1
more curiously this problem would only show up when i ran the release
version of the code. The debug version behaved correctly.
Post a minimal example that compiles.
For other requirements on posting example code, see the FAQ item "How do
I post a question about code that doesn't work correctly?", currently at
<url: http://www.parashift.com/c++-faq-lite/how-to-post.html#faq-5.8>.
After an entire wasted morning I added an unused data member to the
very first interface class and all problems dissapeared like a fart in
the wind.
Main Question: Is this a compiler error or did I violate the standard?
Probably the latter, but not in the way you indicated above.
--
A: Because it messes up the order in which people normally read text.
Q: Why is it such a bad thing?
A: Top-posting.
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