containers

QList of QScopedPointers

我的未来我决定 提交于 2019-12-01 22:44:27
I'm trying to store QScopedPointers in a QList. I found this comment One can also use QList >. – Kuba Ober Jan 14 '14 at 18:17 (first comment on this answer: https://stackoverflow.com/a/21120575/3095014 ) and this post https://forum.qt.io/topic/59338/solved-qlist-of-qscopedpointers which implies that this should work. But if I try to compile the code of the second link, I'm getting this errors: E:\Qt\Qt5Enterprise\5.5\msvc2013\include\QtCore/qlist.h(404) : error C2248: 'QScopedPointer<Label,QScopedPointerDeleter<T>>::QScopedPointer' : cannot access private member declared in class

What are the advantages and disadvantages of using std::stack instead of just deque, vector or list

橙三吉。 提交于 2019-12-01 22:29:26
问题 I am writing a very simple std::stack using vector as its underlying container. I realized that I could replace all the push(), pop() and top() functions with push_back(), pop_back() and back() of the vector container. My questions are: why to use a container adaptor when the controlled use of the underlying container is enough? Why not to use just a deque, vector or list? There will be waste of memory or processing time? 回答1: When your code says std::stack it's clear to the reader what

update a gtk.VBox dynamically

╄→尐↘猪︶ㄣ 提交于 2019-12-01 21:34:56
I have been using this website pretty often in order to solve small issues that I have while programming in Python. This time, somehow I could not find a suitable solution for my situation. So, here is my problem: I want to dynamically add entries to a gtk.VBox widget. The problem is that it doesn't work the way I want it to work. I simply have a button, whose action is to add an additional widget to a VBox. Unfortunately the widget doesn't appear on the window. I guess, I have to add something like a repaint function call, but I didn't find anything like that. Here is a sample code, showing

Running kubernetes autoscalar

不羁的心 提交于 2019-12-01 21:14:17
I have a replication controller running with the following spec: apiVersion: v1 kind: ReplicationController metadata: name: owncloud-controller spec: replicas: 1 selector: app: owncloud template: metadata: labels: app: owncloud spec: containers: - name: owncloud image: adimania/owncloud9-centos7 ports: - containerPort: 80 volumeMounts: - name: userdata mountPath: /var/www/html/owncloud/data resources: requests: cpu: 400m volumes: - name: userdata hostPath: path: /opt/data Now I run a hpa using autoscale command. $ kubectl autoscale rc owncloud-controller --max=5 --cpu-percent=10 I have also

How docker desktop runs linux containers on Windows machine

女生的网名这么多〃 提交于 2019-12-01 20:50:21
I have installed Docker for Windows on my Windows 10 laptop. Now because of this "Docker for Windows" I can run Linux containers too on my windows 10 Laptop. How is it made possible? I have some queries, am I missing something here? See image for better visibility 1) My machine which is Windows 10 has Windows Kernel. Right? 2) When I select option to RUN Linux containers, I think a Linux VM is run on top of my Windows 10 machine and on top of that Linux Containers are run. Is that correct? 3) If a Linux VM is run on TOP of Windows machine, whose kernel is used? Linux VM kernel or windows 10

Item control to delete itself from container control

半世苍凉 提交于 2019-12-01 19:28:39
问题 There's a container control, a TScrollBox, that parents multiple item controls. Every item control, being compound itself, contains (parents & owns) a delete button. Pressing the button initiates the deleting of the item control. The deleting involves freeing the component and so the actual operation should be extrinsic with regard to the item. The question is, what would be the best way to do it? I actually know of a couple of options: a timer with a small interval (which is started with the

What are the advantages and disadvantages of using std::stack instead of just deque, vector or list

血红的双手。 提交于 2019-12-01 19:10:53
I am writing a very simple std::stack using vector as its underlying container. I realized that I could replace all the push(), pop() and top() functions with push_back(), pop_back() and back() of the vector container. My questions are: why to use a container adaptor when the controlled use of the underlying container is enough? Why not to use just a deque, vector or list? There will be waste of memory or processing time? When your code says std::stack it's clear to the reader what operations they need on the container... it communicates and documents while enforcing that no other operations

Efficient appending to a variable-length container of strings (Golang)

懵懂的女人 提交于 2019-12-01 18:12:14
The problem: I need to apply multiple regexes to each line of a big log file (like several GB long) , gather non-empty matches and put them all in an array (for serialization and sending it over the network). Slices are not much help if answer to this question holds: If the slice does not have sufficient capacity, append will need to allocate new memory and copy the old one over. For slices with <1024 elements, it will double the capacity, for slices with >1024 elements it will increase it by factor 1.25. Since there can be literally hundreds of thousands of regex matches, I can't really

How to create a container of noncopyable elements

梦想与她 提交于 2019-12-01 17:08:49
Is there a way use STL containters with non-copyable elements? something like this: class noncopyable { noncopyable(noncopyable&); const noncopyable& operator=(noncopyable&); public: noncopyable(){}; }; int main() { list<noncopyable> MyList; //error C2248: 'noncopyable::noncopyable' : cannot access private member declared in class 'noncopyable' } No, non-copyable elements can't be in C++ container classes. According to the standard, 23.1 paragraph 3, "The type of objects stored in these components must met the requirements of CopyConstructible types (20.1.3), and the additional requirements of

What happens if I use vector::begin() instead of std::back_inserter(vector) for output of set_intersection?

删除回忆录丶 提交于 2019-12-01 15:51:41
I have been using the highly concise and intuitive C++ syntax for finding the intersection of two sorted vector s and putting the result in a third vector : vector<bar> a,b,c; //... std::set_intersection(a.begin(),a.end(),b.begin(),b.end(), std::back_inserter(c)); This should set c to intersection( a , b ), assuming a and b are sorted. But what if I just use c.begin() (I thought I saw an example somewhere of this, which is why I did): std::set_intersection(a.begin(),a.end(),b.begin(),b.end(), c.begin()); set_intersection expects an OutputIterator at that parameter. The standard I believe