The next round of changes to Persistent are in. V8_USE_UNSAFE_HANDLES no
longer exists. Persistent now has a second template parameter that
controls copy and assignment behaviour. The default parameters keep the
behaviour unchanged. To allow copying one could use such a class as the
below
template<class T>
struct CopyablePersistentTraits {
typedef Persistent<T, CopyablePersistentTraits<T> > CopyablePersistent;
static const bool kResetInDestructor = true;
template<class S, class M>
static void Copy(const Persistent<S, M>& source, CopyablePersistent*
dest) {}
};
the Copy function is called on both copy and assign, and the kResetInDestructor
variable controls whether Reset is called in the destructor.
Setting kResetInDestructor = true is highly recommended, and we plan on
changing the default traits class at some point to do this.
We will keep the default functionality of disallowing copying and
assignment as is, as these are expensive operations. An embedder should
only perform them intentionally.
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