There are two widely-used memory allocation techniques: automatic allocation and dynamic allocation. Commonly, there is a corresponding region of memory for each: the stack and the heap. Stack The stack always allocates memory in a sequential fashion. It can do so because it requires you to release the memory in the reverse order (First-In, Last-Out: … Read more
How can it be? Isn’t the memory of a local variable inaccessible outside its function? You rent a hotel room. You put a book in the top drawer of the bedside table and go to sleep. You check out the next morning, but “forget” to give back your key. You steal the key! A week … Read more
In C++, it would be achieved with this. std::vector<node *> problem(length); The code you show is effectively emulating a small subset of the features of vector. Namely, an array-like container that is aware of its size.
You are using ARC based project there is no need to release memory, it will automatically managed. Your problem is somewhere else please post some more code.
What algorithms are used? Java uses TLAB (Thread Local Allocation Buffers) for “normal” sized objects. This means each thread grab some Eden space and turns this grab of memory into individual objects. Thus small objects are typically sequential in memory for that thread, except if a new chunk of memory needs to be grabbed. Large … Read more
In the real world, dynamic allocation is slower than automatic allocation. That’s true — at least in general. That doesn’t mean that dynamic allocation is too slow. The only way to determine that is to profile your code. Until you have done that, it is impossible to say that you should abandon dynamic allocation because … Read more
Just create an iterator method using yield return, like so: public class Combinations: IEnumerable<Combination> { public IEnumerator<T> GetEnumerator() { Combination currentCombination = Combination.FirstCombination(); while (currentCombination.IsValid()) { yield return currentCombination; currentCombination = currentCombination.NextCombination(); // return invalid combo if currentCombination is the last possible combination } } } Of course you still have to write the Combination … Read more
It’s explained in your favorite C++ tutorial in section 6.9.
Missing the real questions, but probably the following : DBFactory.CreateDabase value should be disposed at the end. Moreover you are keeping the last value alive by keeping the reference within you class. Why are “dal, query, ds and cmd” some fields of the class ? They are different each time you run a query. Declare … Read more
Neither new or delete form part of ANSI C. They are part of the C++ standard. In C dynamic memory allocation on the heap is performed using malloc(), free() and associated functions which form part of the C library (rather than being native to the language itself as the new and delete operators are in … Read more