[C++-sig] Multiple python interpreter contexts
clay at idleengineer.net
Tue Feb 22 23:03:06 CET 2005
Stefan Seefeld wrote:
> It turns out that this does a shallow copy, i.e. pyNamespace2.ptr() ==
> and thus modifications to one are immediately visible in the other.
> I'm a bit puzzled by this, too, as comments in dict.hpp indicate:
> // dict() -> new empty dictionary.
> // dict(mapping) -> new dictionary initialized from a mapping
> // (key, value) pairs.
> // dict(seq) -> new dictionary initialized as if via:
> As there is no mention of the copy constructor I would assume the one
> applies is 'dict(mapping)', but it doesn't appear to. David ?
> In python, you have to explicitely ask for a deep copy by calling the
> 'copy' method.
> That should work from within C++, too, i.e.
> dict pyNamespace2 = pyNamespace.copy()
Thanks, that did it. I'm still a bit baffled by that as well.
Certainly in Python that's how it's done: calling the constructor
explicitly will perform a deep copy, giving you a new object.
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