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Strongswan, the open source IPSec VPN software (https://www.strongswan.org/) is written in object oriented C. Ref: https://docs.strongswan.org/docs/5.9/devs/objectOrientedC.ht...

I have not looked through the source myself but thought this might be an interesting reference.

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I can confirm that indeed Strongswan is written in OOP C.

This is relatively common in software with a modular architecture that is intended to run on embedded systems and whose design dates back from a time when C++ standard library was not really well supported on such systems. This is also useful when performance is highly important and you can't afford the C++ vtable overhead.

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