Exercise: Use std::vector in UserDB¶
Description¶
The original C implementation of our sophisticated user database is in
userdb.h (download)
userdb.cpp (download). It has
a number of shortcomings.
Can contain only a maximum number of 10 users - it has a C array of struct User whose size happens to be 10.
There is a
userdb_init()function which must be called in order to initialize it properly.
Reimplement that struct UserDB as class UserDB, as follows:
The class uses a
std::vector<User>instead of the plain old C arrayThe class has a default constructor
In a test program (call it, say, userdb-main.cpp, see below),
instantiate an object of class UserDB. This is only to test that
all is implemented properly; we will implement the remaining methods
in a moment.
#include "userdb.h"
int main()
{
UserDB db;
return 0;
}