Programming VIP

Template meta programming example - how to design a general geometry Library design principle Suppose you need to use a c + + program to calculate the distance between two points You might do this: First define a struct: struct mypoint { double x, y; }; Then define a function containing the calculation algorithm: double distance(myp ...

I jdbc connection pool The connection between the program and the database is the underlying technology. Each connection is time-consuming, and after it is used up, the connection must be closed to release resources. In fact, it is a waste of time to connect and release repeatedly. Therefore, a connection pool technology is introduced to manag ...