[Qt-interest] How to clear QVector without releasing memory?

[Thiago Macieira]

Em Tuesday, 21 de June de 2011, às 04:44:46, Nikos Chantziaras escreveu:
> What do you mean with "clears existing elements".  How can you "clear" an 
element?  This is not an operation I'm familiar with.

Destroy them. If the element is a non-POD, then QVector will call its 
destructors.

QVector::resize calls QVector::realloc(0, d->alloc) which means it will not 
release memory, but it will run this loop:

        while (asize < d->size) {
            (--pOld)->~T();
            d->size--;
        }

That is the "clear existing elements".
-- 
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
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