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> If you want to distribute your library as a binary object and a separate source-form interface/header today, you'll have to use a (wrapper) C API. Regardless of how "modern" the C++ code is.

Not really.

Those of us on Windows make use of COM, or since Windows 8, UWP components (formally known as WinRT).

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Yes, but this is only a solution if your library is only targeting windows.

If you want users of any standards-compliant C++ implementation to be able to use your library today, you'll still have to go with c-abi symbols or ship the sources. All other worakrounds are vendor-specific and not part of the standard.

[Of course even objects containing only C symbols are not portable across platforms either, but at least the C ABI/calling convention is more or less strictly defined for any given target platform. Assuming no other platform-specific stuff like glibc is used]

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