[Dune-devel] [GSoC2016] Junior job about the Python bindings

[Michaël Sghaïer]

Oh, I just realized that I forgot the "this" pointer parameter for my
function get_item... Shame on me. Whatever, I can now handle a range of
dimensions and even several data types!
I will now focuse on the unit test (before sending a git patch) and a draft
for my proposal.

Best,
Michaël

2016-03-16 3:25 GMT-04:00 Michaël Sghaïer <sghaier.michael at gmail.com>:

> Hi,
>
> I have been working on the junior job related to the Python bindings for
> two days and I have some questions:
>
> 2016-03-15 14:51 GMT-04:00 Andreas Dedner:
>
>> Note that FieldVector derives from DenseVector and many methods that need
>> to be wrapped are implemented there.
>>
>
> Do we have to wrap the methods of DenseVector too or just the methods of
> FieldVector?
>
> Until this junior job, I never used Boost.Python. Though I found it very
> interesting and funny to play with, it's a little tricky to use. Can you
> confirm me that we can't wrap the following constructors, due to the fact
> that templates have to be instanciated at compile time:
>
>
> template<class C>
> FieldVector (const DenseVector<C> &x, ...)
>
> and
>
> template<class K1, int SIZE1>
> explicit FieldVector(const FieldVector<K1, SIZE1> & x)
>
> ?
>
> (same for Base::operator= I guess)
>
> Last question, the junior job says that the wrapper should work with a
> range of dimensions. I assume that means it should be easy for a user to
> add a wrapper for a particular dimension (because templates can't be
> specialized at runtime, through the Python interpreter, right?).
>
> I tried to define a template<int SIZE> struct registerFieldVector which
> defines a static function pointer get_item to wrap operator[] but it
> doesn't work. I have been debugging for hours now and I don't find a
> solution.
>
> For example,
>
> static double& (*get_item) (Dune::FieldVector<double, SIZE>::size_type);
>
> ...
>
> template<>
> double& (*RegisterFieldVector<7>::get_item) (Dune::FieldVector<double, 7>::size_type = &Dune::FieldVector<double, 7>::operator[];
>
> raises the error: "error: cannot declare pointer to ‘double&’ in static double& (*get_item) (Dune::FieldVector<double, SIZE>::size_type);"
>
>
> Could you give me any lead?
>
> Best,
> Michaël
>
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