You need to use a C++ video-processing library from a Swift app. Would you go with the old approach (an Objective-C++ wrapper) or Swift 5.9's C++ interop?
The traditional approach wraps the C++ in a .mm (Objective-C++) wrapper class and exposes only an Objective-C interface to Swift; since Swift 5.9, a modulemap plus -cxx-interoperability-mode=default lets Swift import C++ types and functions directly. Small surface, use the wrapper; large surface with performance needs, use interop.
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