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Take Assessment: Exercise 5

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Maintaining Bids

implementations

Goals: This assignment is designed to reinforce the student's

understanding and use of the STL priority_queue.

Outcomes: Students successfully completing this assignment

would master the following outcomes.

 Use the STL priority_queue

 Produce C++ class implementations given class

declarations

Background

A typical online auction system displays the highest bid for each

implementation of class Advertisement and class Client, and

complete the implementation of function displayBidHistory.

Class Bid

Class Bid models a bid placed on an advertisement. This class

contains private data members to store the email address of the

user who placed the bid, the dollar amount of the bid, the number

of items bid on, and the date and time of the bid. The class

declaration includes the following public members.

 Default constructor

Initializes the private data members to default values

Provides access to the data members of the class

 istream &operator>>(istream &stream, Bid &b);

Reads a Bid object from an input stream. The bid should

input the following data members of the class in the form

email \n amount \n quantity \n date \n

 virtual bool operator< (const Bid &rhs);

Compares the invoking Bid object against the parameter to

determine if the invoking Bid object is less than the

parameter Bid. Use the dollar amount to compare two bids.

 virtual bool operator== (const Bid &rhs);

in an instance of the STL priority_queue adapter. Finish the

implementation of the following methods.

 virtual priority_queue<Bid>& getBids(void);

Returns a reference to the priority queue of bids