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matusnovak / wrenbind17

A header only library for binding C++17 classes and functions to Wren, an embeddable programming language
https://matusnovak.github.io/wrenbind17
MIT License
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Passing a map to C++ #2

Closed davlhd closed 4 years ago

davlhd commented 4 years ago

Hello,

I am playing around with wrenbind17 and I can not figure out how to pass a Wren map or Wren array from Wren to C++. Is that possible?

Thanks, David

matusnovak commented 4 years ago

Hi @davlhd

Unfortunately passing a map is not possible in Wren (I mean the native map), at least at the moment. There is some talk about that here: https://github.com/wren-lang/wren/pull/725 which is only relatively new.

But, it is possible to do it with foreign class maps or lists. Essentially, creating a C++ map in Wren, putting in the data, then passing that C++ map instance from the Wren back to the C++. I have written a wrapper for lists and have written a tutorial for it here: https://matusnovak.github.io/wrenbind17/tutorial/lists/ I haven't written a wrapper for maps yet, but if you give me few hours I can do that now.

As for passing native Wren arrays, that has not been implemented here in WrenBind17. I am more than happy to receive some suggestions on the API design of that, because it was in my to-do list.

matusnovak commented 4 years ago

@davlhd

I have added some basic support for std::map and std::unordered_map. It's done via StdMapBindings<Key, Value>::bind(module, "ClassName"); The changes have been pushed to the master.

You can read more about it here: https://matusnovak.github.io/wrenbind17/tutorial/maps/ The tutorial also contains some pointers on how to implement a custom wrapper for your map in case you use non-std map.

Unfortunately native Wren maps are not supported at the moment as I have mentioned in the previous comment.

Does this solve your problem?