Why when the destructor of the parent class is defined as virtual, delete pTest2 releases the resources of Derived, otherwise it can only release the resources of Base, and delete pTest1 can release the resources of Derived and Base class Base { public...
-sharpinclude <iostream> using namespace std; class a { public: void virtual x() { cout << "x" << endl; } void xx() { cout << "x1" << endl; } }; class b :public a { public:...
I want the woocommerce checkout page to load a separate header. Why can t I find the relevant php template page that I can modify? I looked at figure 2, which was loaded into the wp page as a short code. What should I do if I want to load independent he...
A new mysql user has been created. After starting mysql, check to see if it is successful. It didn t work out. start: [root@izwz9ehou8f1mblwoj6hb4z mysql]-sharp . bin mysql user=mysql basedir= usr local mysql datadir= usr local mysql data . bin mysq...
for example, the navigation bar has two buttons with the following address: www.xxx.com page1 A.vue www.xxx.com page2 B.vue at this time, there are secondary pages called A1.vue and B1.vue in An and B www.xxx.com page1 subpage1 A1.vue www.xxx.com pa...
I used vue-cli and a set of front-end templates, and I introduced the template s js files together in vue-cli s index.html. The sidebar of the template is included in the parent component of the page as a component. But the menu element click event in...
I have a test.py file that imports the pymysql module. Enter python test.py on the terminal to run successfully, but if you enter python3 test.py, you will report an error ImportError: No module named pymysql . I think this is due to the inconsiste...