C++

I would just like to know how I go about initializing in the constructor. I am new to vectors and more familiar with using pointers to access properties within a specific class. How would you go about creating a NEW Trendtracker tracking no hashtags? Thank you in advance private: // A simple class representing a hashtag and // the number of times it has been tweeted. class Entry public: string hashtag: int pop I/ Entries containing each hashtag and its popularity. vector bil /1 Creates a new Trendtracker tracking no hashtags /1 Must run in 0(1) time Trendtracker11 Trendtracker()