containers

问题 I would like to use -1 to indicate a size that has not yet been computed: std::vector<std::size_t> sizes(nResults, -1); and I was wondering why isn't there a more expressive way: std::vector<std::size_t> sizes(nResults, std::vector<std::size_t>::npos); 回答1: From cppreference: std::size_t is the unsigned integer type of the result of the sizeof operator as well as the sizeof operator and the alignof operator (since C++11).... ...std::size_t can store the maximum size of a theoretically

问题 I have pushed container images using gcloud docker push to the Google Container Registry. Two questions: How do I see how much space all my images use? (I can see individual images but I want a total in order not to navigate to all and make a sum) 回答1: Good questions! All your Docker images are stored in a Google Cloud Storage bucket called artifacts.<PROJECT-ID>.appspot.com (Replace <PROJECT-ID> with your project's ID) To find the total space, run gsutil du gs://artifacts.<PROJECT-ID>

问题 There is the boost.container flat_map and others, and the Loki AssocVector and many others like these which keep the elements sorted. Is there a modern (c++11 move-enabled, etc.) implementation of an unsorted vector adapted as a map/set? The idea is to use it for very small maps/sets (less than 20 elements) and with simple keys (for which hashing wouldn't always make sense) 回答1: Something like this? template<class Key, class Value, template<class...>class Storage=std::vector> struct flat_map

问题 I have a raspberry pi cluster (one master , 3 nodes) My basic image is : raspbian stretch lite I already set up a basic kubernetes setup where a master can see all his nodes (kubectl get nodes) and they're all running. I used a weave network plugin for the network communication When everything is all setup i tried to run a nginx pod (first with some replica's but now just 1 pod) on my cluster as followed kubectl run my-nginx --image=nginx But somehow the pod get stuck in the status "Container

问题 I implemented my own custom container view controller and I try to make it compatible with iOS 7 view controller transitions. I make my custom container view controller conform to UIViewControllerContextTransitioning and I send self when I call transitionDuration: and animateTransition: . It all works fine as long as I use only animated transitions. Now I want to make it work with interactive transitions, so I call the interaction controller's startInteractiveTransition: instead of the

问题 I was confused by the lack of these functions in the interface for the Sequence type, since Data.List provides these functions. Is there an efficiency problem here, or is it just a lack of demand for these functions? And since they're not part of Data.Sequence, how can I efficiently implement them for my purposes? 回答1: Here's what I came up with: > let insertBy cmp x seq = let (s1,s2) = partition (\y -> cmp x y == GT) seq in (s1 |> x) >< s2 > let s = fromList [1,2,3,4,5] > insertBy compare 2

问题 I have the following code to create a container which pretends to behave like the set of all prime numbers (actually hides a memoised brute-force prime test) import math def is_prime(n): if n == 2 or n == 3: return True if n == 1 or n % 2 == 0: return False else: return all(n % i for i in xrange(3, int(1 + math.sqrt(n)), 2)) class Primes(object): def __init__(self): self.memo = {} def __contains__(self, n): if n not in self.memo: self.memo[n] = is_prime(n) return self.memo[n] That seems to be

问题 In my c++ template struct I want to use different container types which use different allocators, e.g. std::vector and thrust::device_vector. I need to specify the allocator explicitely, otherwise I get "wrong number of template arguments (1, should be 2)": template<typename T, template <typename, typename> class Container, typename Alloc> struct wrap_into_container { typedef Container<T, Alloc> type; }; Since the different container classes use different allocators, I have to specify the

问题 First of all, I'm using Hadoop-2.6.0. I want to launch my own app master on a specific node in a YARN cluster in order to open a server on a predetermined IP address and port. To that end, I wrote a driver program in which I created a ResourceRequest object and called setResourceName method to set a hostname, and attached it to a ApplicationSubmissionContext object by calling setAMContainerResourceRequest method. I tried several times but couldn't launch the app master on a specific node.

问题 Related to this thread, I am trying to create 2 containers: 1 with a rails app, and the other with a MySQL database but I keep getting the Mysql2::Error (Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' in my apps production.log file after I hit the container's IP http://192.168.59.103 When I start the rails container, I am attempting to link them and do get an error if I specify an incorrect MySQL name. What am I missing to successfully link the containers so