deque

Which way gives the faster enqueueing and dequeuing when I have to insert very few elements, Is array better than a linked list? I need to insert few element and I have to remove and read that removed element from queue. If it is array I may have to modify the indexes every time I remove an element. Inserting and deleting may happen simultaneously also. Which one is better from below case? typedef struct{ mylist list; struct mylistQ *next; }mylistQ; Array Code static mylist myListQ[QUEUESIZE+1]; int qLast = 0; void enqueue_element(mylist qItem) { myListQ[qLast] = qItem; qLast++; } mylist

Not so far I've learned how std::deque is implemented under the hood, and discovered that it's something like an array of pointers to n-byte arrays, where the data is actually stored. So now I have a couple of questions related to deques. A picture that describes my current knowledge about it's structure: The questions are: When a push_front operation is being performed and there is no free space in Data Block 0, a new Data Block is allocated on heap and a pointer to this freshly allocated memory is inserted into 'Map' array like in ordinary array -- in O(number_of_blocks) time, yes? How to

sorry, just following on from the question I had here : here I am trying to run this method to remove a generic value (EltType) from a double sided queue(deque), but I keep getting an error in that, I call insertFirst twice, and insert the value "3" into the array twice, then, when I run removeFirst, it will print out "3" once, and then "Null" thereafter. Would anyone be able to help me out please ? class ArrayBasedDeque<EltType> { private final int CAPACITY = 10; private int capacity; private int end; private EltType deque[]; public ArrayBasedDeque() { this.capacity = CAPACITY; deque =

I'm looking at the documentation for a Python deque, and it looks like the constructor is deque([iterable[, maxlen]]) . Is there no way to make an empty deque (that is, without specifying the iterable) with a max length? You could provide a list literal directly, so you don't have to declare anything on a separate line: >>> collections.deque([], 42) deque([], maxlen=42) You could also provide maxlen as a named argument: >>> collections.deque(maxlen=23) deque([], maxlen=23) 来源： https://stackoverflow.com/questions/26124816/creating-an-empty-deque-in-python-with-a-max-length

Follow up to What the heque is going on with the memory overhead of std::deque? Visual C++ manages deque blocks according to the container element type using this: #define _DEQUESIZ (sizeof (value_type) <= 1 ? 16 \ : sizeof (value_type) <= 2 ? 8 \ : sizeof (value_type) <= 4 ? 4 \ : sizeof (value_type) <= 8 ? 2 \ : 1) /* elements per block (a power of 2) */ This results in very large memory footprint for small elements. By changing the 16 in the first line to 128 I was able to drastically reduce the footprint required for a large deque<char> . Process Explorer Private Bytes dropped from 181MB -