boost::python, returning new PyObject references

[Arnaldur Gylfason]

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Here is the code.
objects.hpp and objects.cpp

Next step is making final (for the moment) decision regarding design and
the going on from there.
Adding the operators to be able to do m["k"] += 3 etc. is probably next.
Changing all proxies/ op[] in other classes should be done.


objects_b.hpp has the proxies that do not use the callbacks.
tmodule.cpp is a test module.
(See attached file: objects.hpp)(See attached file: objects_b.hpp)(See
attached file: objects.cpp)(See attached file: tmodule.cpp)

Comments:

object is a virtual base class for sequence and mapping.
seqmap inherits from both.
The proxies inherit from seqmap and thus provide both a sequence and
mapping interface.

If a non-existent key is accessed, a Null ref (default constructed) is
stored in the proxies object_base.
Then the mapping::proxy stores a callback in the object_base that will call
PyObject_GetItem when used in
any way other than setting a new key-value pair.

The proxies call reset after setting a new item to reflect the change.
That means the behaviour of multiple assignment is as would be expected:
          python::sequence seq2 = seq[2] = 5;
I.e. seq2 gets 5 (instead of 3 which was the old value).

const correctness is respected: If items are accessed for const
sequences/mappings,
only const methods in object, sequence or mapping can be used.
All methods that can possibly change the underlying PyObject are non-const.

Constructors for seqmap and proxies call the object constructor directly
because it is a virtual base class.
There is no default constructor for the virtual base class.
Many consider that bad practice but a default constructor wouldn't make
sense in this case I think.

Implicit Copy constructor and destructor respect virtual base classes.
According to the version of the Draft standard I found, the operator= could
assign the virtual base class
more than once - unspecified behaviour. => seqmap::operator= is defined.

The copy constructor is specified in the object_base because of strange
behaviour.
When the ref holds a NULL object a Segmentation Fault occurs if it is used
to copy construct another one.
(Since the ref copy constructor calls Py_XINCREF it should handle NULL ,
any ideas?).
Any way, by directly passing reference() in this case the callback is used.
In case of illegal key access
the Key Error is thrown here.


I believe all concrete object interfaces (like tuple, list, dictionary,
...)should inherit from object_base.
If their interface has all relevant member functions there is no need to
inherit from object or sequence.
The idea of list<>, list<object>, list<sequence> , ...:
     template<class ObjectType = object_bas>
     list : public ObjectType
is interesting.
When ObjectType is sequence or other class that inherits virtually, a
problem arises.
The constructor would have to call the object constructor directly.
Hard if inherited fdrom a template parameter.
For now I believe just inheriting from object_base is good.
What do you think?

Cheers

Arnaldur

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Content-Disposition: attachment; filename="objects_b.hpp"
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--0__=00256B270048BEB98f9e8a93df938690918c00256B270048BEB9
Content-type: application/octet-stream; 
	name="objects.cpp"
Content-Disposition: attachment; filename="objects.cpp"
Content-transfer-encoding: base64

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Content-type: application/octet-stream; 
	name="tmodule.cpp"
Content-Disposition: attachment; filename="tmodule.cpp"
Content-transfer-encoding: base64

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