[setup] Why does PackageSpecification have a private copy-constructor? (Robert?)

[Robert Collins]

On Mon, 2004-08-30 at 18:33 +0100, Max Bowsher wrote:
> I can't see why setup's PackageSpecification class has a private 
> copy-constructor.
> Am I missing something?

erm. to only allow the class itself to create copies.

> The reason why I am suddenly interested is that the C++ standard says that 
> this:
> 
> foo(SomeClass())
> 
> requires SomeClass's copy-constructor to be accessible (bizarre, no?) and 
> g++ 3.4 has decided to enforce this. 

Even if that is in a method:
SomeClass *
SomeClass::funkyCopy() const
{
  SomeClass *result(self);
}
?

> So, unless I can make the 
> copy-constructor public (which I don't want to do if doing so risks other 
> problems), I need to rewrite all code like:
> 
> do_something(PackageSpecification(somename))
> 
> to:
> 
> PackageSpecification tmppkgspec(somename);
> do_something(tmppkgspec);
> 
> which isn't very nice.

So we have code like that at the moment?

Rob
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