[Ns-developers] CreateObject and non-default constructors

[Mathieu Lacage]

hi,

Recently, someone pointed out to me privately that we poorly support
calling non-default constructors with CreateObject. In fact, we don't
support it. I will skip over the lengthy discussion of how we ended up
where we are today, and, instead, will get to what we could do to
support this: 2 options (patches attached).

1. compatible option (a.patch)
2. less compatible option (b.patch)

1) compatible option: introduce CreateObjectNoAttributes: 

template <typename T>
Ptr<T> CreateObjectNoAttributes (void);

template <typename T, typename T1>
Ptr<T> CreateObjectNoAttributes (T1 a1);

template <typename T, typename T1, typename T2>
Ptr<T> CreateObjectNoAttributes (T1 a1, T2 a2);

...

It's not very pretty for something which appears to be regularly
complained about by users.

2) less compatible option: modify CreateObject, introduce
CreateObjectWithAttributes

Despite not being fully compatible with existing code, I expect the
fallout on users to be minimal because, frankly, no one calls
CreateObject<> with construction-time attributes so, almost no one will
notice this change.

If I hear no comments within 2 days, I will proceed with applying these
two patches to ns-3-dev together with the associated CHANGES.html notes.

regards,
Mathieu
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