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I would think you are referring to implementations of the one prevailing idiom as opposed to seeing multiple idioms for the concept. The idiomatic way to represent a growable list in C is to make a list (using some implementation) and put it in a structure with bookkeeping data, then using that list by passing it (or a pointer to it) to plain old functions to use it.

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Of course I'm talking about an idiomatic implementation, what else would I be talking about in this context?

> The idiomatic way to represent a growable list in C is to make a list (using some implementation) and put it in a structure with bookkeeping data, then using that list by passing it (or a pointer to it) to plain old functions to use it.

That sounds like a long-winded way to say "there's no one idiomatic growable list in C".

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