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Since you never traverse the list, the order of elements obviously doesn't matter. In that case, you can just swap the element to remove with the last element.

A vector will still give you better cache-locality and also amortize the number of allocations.

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Yes, that's exaclty what ZeroMQ is doing. Then check how the code looks like. It's a mess. Intrusive containers deliver same performance characteristics and the code actually looks clean.

And what stops you using an intrusive datastructure in C++?

Nothing. But if he is going to write C in C++, then what is the point of writing C++? Especially sticking to C gives substantially increased flexibility in terms of language bindings, embedded usage etc.

I've probably spent more years writing C++ code than C code, but I'm all with him on this - if what you need to do for whatever reason don't need/benefit all that much from C++ when accounting for all constraints, then choosing C as being the lowest common denominator between other languages is a very good choice for a library.

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