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<p style="margin: 10px 0 0 0">TL;DR, we'll have to move away from ptr_vector, I think. I need to see what options might exist for managing objects indirectly or if there are newer smart pointer tricks we could use.</p>
<p style="margin: 10px 0 0 0">I reviewed the code, there's no question the intent here was to have the ptr_vector own the OpenSSLPathValidator objects and take care of destroying them. That was why I used that container in many places, to get rid of the explicit "loop over container to destroy objects" anti-pattern that turns C++ into C.</p>
<p style="margin: 10px 0 0 0">As you suggested, I think what happened is that in earlier versions of Boost, because it never tried to use the missing methods, no error with the template. The template changed and is doing perhaps more error checking and just being more strict with the code contract, and it's blowing up "just in case" you called an operation on the vector that would have to copy an object. I never do, but it doesn't care now.</p>
<p style="margin: 10px 0 0 0">The PathValidator plugin type like most of the plugins, is non-copyable very much by design, to avoid needing to expose those kinds of details and behaviors. Plugins aren't meant to be copyable in general, and unless they implement a cloning API, there's no way from the outside to do that.</p>
<p style="margin: 10px 0 0 0">I would expect other bits of code to blow up on this issue though. I'll review other places I've used it.</p>
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