Re: [Boost-users] memory used by vector<int> vs vector<char>

Subject: Re: [Boost-users] memory used by vector<int> vs vector<char>
From: Lloyd (lloydkl.tech_at_[hidden])
Date: 2013-08-21 08:07:52

Thanks Igor, that clarifies my question

On Wed, Aug 21, 2013 at 5:13 PM, Igor R <boost.lists_at_[hidden]> wrote:

> > If I create a vector<int> of 100 elements and a vector<char> of 100
> > elements, will there be any difference in the total memory used by them?
>
> Yes, if sizeof(int)>sizeof(char) on your platform, then vector<int>
> consumes more memory than vector<char>, because the Standard requires
> that  "the elements of a vector are stored contiguously, meaning that
> if v is a vector where T is some type other than bool, then it obeys
> the identity &v[n] == &v[0] + n for all 0 <= n < v.size()."
>
> > or which is more efficient?
>
> What do you mean by saying "more efficient"?
> vector<char> consumes less memory, but accessing its elements might be
> less efficient on some platforms.
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