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 array
The 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.

userdb-main.cpp¶

#include "userdb.h"

int main()
{
    UserDB db;
    return 0;
}