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I've painfully learned during last few days a lot about programming in c++.
I love it :)
I know I should release memory - the golden "each malloc=free" or "each new=delete" rules exist now in my world, but I'm using them to rather simple objects.
What about vector ? Wherever I can, I'm using vector.clear() but that clearly isn't enough, because I'm having huge memory leaks.
Could you guide me on how should I treat this thing?
*Edit
Thanks, your comments made me think about the alghorithm of this application and I'll be able to eliminate the vector totally. :O
Sorry - I started explaining what is my use case here and I found out what I really need. It's like that when you code last 3 days for 18 hours a day :| *Edit 2
This is crazy. By small changes in code, I've eliminated memory usage from 2x130 mb (constantly growing) into 2x 13,5mb, constant size. Thanks for making me think about that in another way.
Btw. such self code review got a name - anyone remember that? It's when you ask anyone (even your mother or dog) and start explaining what's your problem - and suddenly you solve this 5 hour problem yourself, just by trying to look at it from other point of view, or just by trying to summarize what's it all about. I often find myself being catched on that...
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clear() function is used to remove all the elements of the vector container, thus making it size 0.
Yes, erase destroys the element.
It depends. The default destructor for your class A will call the destructor for your vector<B*> . Thus, if you don't need to do any special clean-up for the elements in your vector, you don't need to write a destructor.
A vector of strings is created the way a vector of any other type would be created. Remember to make the template specialization, string. Do not forget to include the string library and the vector library. The common ways of creating vectors with string as the element type have been illustrated above.
The rule is that when you clear a vector of objects, the destructor of each element will be called. On the other hand, if you have a vector of pointers, vector::clear() will not call delete on them, and you have to delete them yourself.
So if all you have is a vector of strings, and not pointers to strings, then your memory leaks must be caused by something else.
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Calling v.clear() will destroy all objects that are currently held inside v, but it will not release the memory (it is assumed that the vector will soon be filled again).
If you really want to free the memory, the idiom is
vector<string>().swap(v); This will create a new (temporary) vector and swap its contents with v. The temporary vector is then destroyed, freeing the memory along with it.
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