------- Comment #4 from fang at csl dot cornell dot edu 2006-07-13 22:06
-------
Subject: Re: error: ' error: 'MyClass::MyClass(const MyClass&)'
is private error: within this context
> ------- Comment #3 from kk at microfocus dot com 2006-07-13 21:49 -------
> (In reply to comment #2)
> > If it is in our (Rogue Wave) current code, could you please let us know
> > where
> > so we can look into fixing it? (It's doesn't matter whther gcc does the
> > right
> > thing here or not, our code should be portable either way.) Thanks!
>
> OK, here goes. This is what I'm getting. If you guys do have a fix let me
> know.
> You have an operator overload for the Expr but it really can't be used in this
> case cause the const constructor is private.
Here's a test case to demonstrate a workaround or solution:
--------------->8 snip 8<----------------
class foo {
private:
foo(const foo&);
public:
explicit
foo(int) { }
// HERE's the magic
operator foo& () { return *this; }
};
class streamer {
public:
streamer&
operator << (const foo&) {
return *this;
}
};
int
main(int, char*[]) {
streamer s;
s << foo(0) << foo(1);
return 0;
}
--------------->8 snip 8<----------------
All I've done is add a reference converter operator to the class with
the private copy-constructor. Try commenting out the magic line to see
the difference in compilability on 4.0 and higher.
This works with -W -Wall -Werror -ansi -pedantic-errors for
g++ versions 3.3, 4.0, 4.2. (don't have 3.4, 4.1 handy)
I admit this might not be a pretty solution, but it requires a one-line
addition to get things going. Comments and suggestions welcome.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28365
