containers

问题 What are containers/adapters ? Someone please explain in layman's language . I have tried to look up on the internet but the definitions and explanations are too technical and hard to understand. I have basic knowledge of C++ and its sub-topics like (class/templates/STL). EDIT 1: Can anyone please give me a practical example of the application of containers/adapters? Just for better understanding :-) Thank you. 回答1: <joke> C++ is technical and hard to understand :-D </joke> Containers are

问题 I cannot find a way of moving docker running containers from one host to another. Is there any way I can push my containers to repositories like we do for images ? Currently, I am not using data volumes to store the data associated with applications running inside containers. So some data resides inside containers, which I want to persist before redesigning the setup. 回答1: You cannot move a running docker container from one host to another. You can commit the changes in your container to an

问题 The 3-argument form of list::splice() moves a single element from one list to the other. SGI's documentation explicitly states that all iterators, including the one pointing to the element being moved remain valid. Roguewave's documentation does not say anything about iterator invalidation properties of splice() methods, whereas the C++ standard explicitly states that it invalidates all iterators and references to the element being spliced. splicing() in practice works as defined by SGI, but

问题 I'm trying to launch postgres in IBM containers. I have just created volume by: $ cf ic volume create pgdata Then mount it: $ cf ic run --volume pgdata:/var/pgsql -p 22 registry.ng.bluemix.net/ruimo/pgsql944-cli After logging into container through ssh, I found the mounted directory is owned by root: drwxr-xr-x 3 root root 4096 Jul 8 08:20 pgsql Since postgres does not permit to run by root, I want to change the owner of this directory. But I cannot change the owner of this directory: # chown

问题 (Yes, I know there is a question with almost the same title, but the answer was not satisfactory, see below) EDIT Sorry, the original question didn't use compiler optimization. This is now fixed, but to avoid trivial optimization and to come closer to my actual use case, the test has been split into two compilation units. The fact that the constructor of std::vector<> has linear complexity is a nuisance when it comes to performance-critical applications. Consider this simple code //

问题 I have an image that doesn't match the aspect ratio of my device's screen. I want to stretch the image so that it fully fills the screen, and I don't want to crop any part of the image. CSS has the concept of percentages, so I could just set height and width to 100%. But it doesn't seem like Flutter has that concept, and it's bad to just hard code the height and width, so I'm stuck. Here's what I have (I'm using a Stack since I have something in the foreground of the image): Widget background

问题 Queue and Stack are a structures widely mentioned. However, in C++, for queue you can do it in two ways: #include <queue> #include <deque> but for stack you can only do it like this #include <stack> My question is, what's the difference between queue and deque, why two structures proposed? For stack, any other structure could be included? 回答1: Moron/Aryabhatta is correct, but a little more detail may be helpful. Queue and stack are higher level containers than deque, vector, or list. By this,

问题 I am trying to build a heap with a custom sort predicate. Since the values going into it are of 'user-defined' type, I cannot modify their built-in comparison predicate. Is there a way to do something like: h = heapq.heapify([...], key=my_lt_pred) h = heapq.heappush(h, key=my_lt_pred) Or even better, I could wrap the heapq functions in my own container so I don't need to keep passing the predicate. 回答1: According to the heapq documentation, the way to customize the heap order is to have each

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 6 years ago . Does anyone know of any C container libraries? I am looking for something which gives standard implementations of linked lists, arrays, hash tables etc, much in the same way as the C++ STL does. Key concerns are: Client code should be able to create containers for multiple different data types without modifying

问题 Brief summary I want to build a set of sets of items in C#. The inner sets of items have a GetHashCode and Equals method defined by their contents . In mathematical notation: x = { } x.Add( { A, B, C } ) x.Add( { A, D } ) x.Add( { B, C, A } ) now x should be{ { A, B, C }, { A, D } } In python, this could be accomplished with frozenset : x = set() x.add( frozenset(['A','B','C']) ) x.add( frozenset(['A','D']) ) x.add( frozenset(['B','C','A']) ) /BriefSummary I would like to have a hashable