We all know that polymorphisms in CPP depend on virtual tables and virtual pointers, so when are virtual tables generated? Is it before or after the constructor is executed? And where are the virtual watches stored? ...
this is the article I refer to. The program that runs according to this article https: blog.csdn.net wangato., as shown in the picture, always reports the error in the first sentence. I Baidu has the reason, but has not been able to solve it. 1. Py...
I am a beginner in C-sharp, and I recently encountered a problem. I don t understand why I got this error index was out of range.Must be non-negative and less than size of the collection code as follows class Program { delegate bool Function(in...
encountered a weird problem while writing code $stack = ; $collections = [1,2,3,4,5,6]; foreach($collections as $key => $collection) { $stack[$key] = $collection . _ . $key; } var_dump($stack); the same code, the output in php7 is 12345...
the problem is that channels is used as an extension of django to support websocket. The front-end page sends data to the backend through websocket, routes to consumer processing, and sends back messages to the front-end after processing. It is perfect,...
ufw cannot be used normally under ubuntu. ufw has been installed, version root@VM-0-8-ubuntu: home ubuntu-sharp sudo apt-get install ufw Reading package lists... Done Building dependency tree Reading state information... Done ufw is already the ne...