[Manifesto] Interoperability between Swift and C++

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Swift provides ergonomic interoperability with C (How Swift Imports C APIs), Objective-C (Importing Objective-C into Swift, Importing Swift into Objective-C), and Python ([1], [2], [3]). Interoperability between Swift and C++ has been previously discussed on the forums ([1], [2], [3]). The Swift for Tensorflow project has already started to build it out under the hidden -enable-cxx-interop flag. I have been trying to understand what interop will look like across all C++ features. I have summari...