Use of auto in cpp meta examples

[avramidis]

This issue is relevant to #4423 In this PR the aim was to convert this python script to a meta example.

When using the factory method to create a CStringFeatures object it is returned as CFeatures. This is fine, however, in the case of generating the meta examples that use this functionality the return object is stored as auto. This doesn't allow the use of CStringFeatures functions.

The problem is caused by the auto in the code below

shogun/examples/meta/generator/targets/cpp.json

Line 14 in d751f66

"Copy": "auto $name = wrap($expr)$kwargs",

Any ideas or pointers of how to fix this?

[karlnapf]

As discussed, I think this is possible with put get, and potentially registering a lazy executed function with get, as done here and the corresponding example