Generating unmanaged C++ wrappers

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Are there tools for automating the conversion of unmanaged C++ headers to
equivalent wrapper classes with metadata?

I've got a back-end library with no exposed inheritance, but the interface
classes are abstract and factory methods return the "real" internal
classes. I'd like to feed the DLL and public headers to a tool to
automatically generate .NET wrappers for customers using C# and VB to write
front-ends.
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