as follows, the main thread calls push () , and the second thread front () reads the head of the queue, and the team is busy when it is empty. As a result, line 11 front () reported an error deque iterator not dereferencable . After taking a look ...
In SGI STL, unused memory is mounted as a linked list in free_list . If there is enough memory in free_list , it is returned directly. However, memory recycling is not necessarily in the order in which memory is requested, which leads to the fact that...
We usually new an object, and the process of requesting memory is completed by operator new, so how does allocator in stl take over operator new to complete the memory request? How is the memory request right of an object transferred? I don t think oper...
when learning < random > library, only seed_seq does not quite understand although I went to MSDN, and cppreference, it is not very clear that there is too little information about seed_seq on Google. my understanding is: when a given seed is not ve...
the standard library container before CPP11 overloaded constant and non-constant object versions for begin and end, and defined cbegin and cend for constant version lines in 11. 11 what is the point of doing this, that is, what is the advantage of suc...
how to imitate the Alipay password pop-up window in the vue single page? ask for advice ...
try to use graphql, in laravel to build a vgrant development environment in local windows. The system is centos7. . use php artisan serve to start a server in the local windows, visit http: 127.0.0.1:8000 graphiql, and display normally: vagrantlo...
<view class= wrap > <text wx:for= {{aString}} >{{item}}< text> < view> data: { aString: 123456789 } what can I do if I want 123 to appear red after a condition is true ...
1. Requirements: remote Mongodb cluster data migration needs to be able to support full + incremental migration. 2. Environment: Mongodb version 3.2.10, sharding cluster mode. There are more than 200 million data. 3. Mongosync, that has tried 360 ha...
the code I tried is as follows: from PyQt5 import QtCore, QtGui from PyQt5.QtWebEngineWidgets import QWebEngineView,QWebEnginePage from PyQt5.QtCore import QUrl from PyQt5.QtWidgets import QApplication app = QApplication(sys.argv) ui = QWebEngineView...