How to wrap functions with an istream or ostream as argument?

[MatthijsBurgh]

I want to wrap 2 cpp functions, one with an istream as argument and one with an ostream as argument. I want them to interface with an io.StrinIO, io.BytesIO or file handler.

I have found an example, https://stackoverflow.com/a/56424840, for the ostream, but not yet for the istream.