Instead of passing around the capacity in a struct or as an extra out parameter until you call free, could you instead branch on capacity == 0 in get_foos and set *out_foos to a null pointer? Just because the vector struct never has a null pointer doesn’t mean you can’t use the null pointer in your own API.
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Instead of passing around the capacity in a struct or as an extra out parameter until you call free, could you instead branch on capacity == 0 in get_foos and set *out_foos to a null pointer? Just because the vector struct never has a null pointer doesn’t mean you can’t use the null pointer in your own API.