What is the best way and place to deallocate the memory?

What is the best way and best place to deallocate memory in Qt? Is the destructor is a good choice to deallocate the memory?
Thanks

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What is the best way and best place to deallocate memory in Qt?

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Not only in Qt - but in general:
When the allocated memory is no longer needed.

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s the destructor is a good choice to deallocate the memory?

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The destructor is the LAST place/time at which an object can free the momory it allocated.
But you should not wait that long if any given chunk of memory is not needed any more - you should free any memory as soon as you can.