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From: Bonita Montero <Bonita.Montero@gmail.com>
Newsgroups: comp.lang.c
Subject: Re: realloc() - frequency, conditions, or experiences about
 relocation?
Date: Mon, 24 Jun 2024 16:16:07 +0200
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Am 24.06.2024 um 10:40 schrieb Lawrence D'Oliveiro:

> On Fri, 21 Jun 2024 21:12:12 +0200, Bonita Montero wrote:

>> Usually you don't resize the block with a few bytes ...

> The usual way I use realloc is to maintain separate counts of the number
> of array elements I have allocated, and the number I am actually using. A
> realloc call is only needed when the latter hits the former. Every time I
> call realloc, I will extend by some minimum number of array elements (e.g.
> 128), roughly comparable to the sort of array size I typically end up
> with.
> And then when the structure is complete, I do a final realloc call to
> shrink it down so the size is actually that used. Is it safe to assume
> such a call will never fail? Hmm ...

In C++ you dont't have to think about that. Do an emplace_back and the
capacity() doubles with libstdc++ and libc++ if the vevtor becomes full.