bidhistory.cpp

本程序给出了SSD5实验课中Exercise6的参考程序 内附有详细的注释 下载后请仔细参照源代码进行分析 切莫完全搬照

#include "bidhistory.h"
#include "Advertisement.h"

void displayBidHistory(ostringstream &oss, Advertisement* ad) {
	string email = ad->getEmail();
	int quantity = ad->getQuantity();
	Client *seller = users[email];
	priority_queue<Bid> bids = ad->getBids();
	int bidsNumber = bids.size();

	//display the essential information
	oss << "Posted by: <A HREF=mailto:>";  
	oss << seller->getLname() << ", " << seller->getFname() << "</a><br>" << endl;
	oss << "Posted: " << ad->getStart() << "<br>" << endl;
	oss << "Closes: " << ad->getClose() << "<br>" << endl;
	oss << "Quantity: "	<< ad->getQuantity() << "<br>" << endl;

	if(bidsNumber == 0){
		oss<<"There are no bids on this advertisement.<br>\n";
		return;
	}

	if(quantity == 1){//For advertisements that contain a quantity of one
		oss<<bidsNumber<<" bid(s).<br>\n";
		Bid current = bids.top();
		oss<<"High bid is $"<<current.getAmount()<<" ("<<current.getEmail()<<")<br>\n";
		return;
	}

	//For advertisements that contain a quantity of more than one
	oss<<"Highest winning bid is $"<<bids.top().getAmount()<<"<br>\n";

	for(int i = 0; i < bids.size() - 1; i++)
		bids.pop();
	
	oss<<"Lowest winning bid is $"<<bids.top().getAmount()<<"<br>\n<br>\n";
		
	bids = ad->getBids();
	oss<<"Highest bidders are: "<<"<br>\n<br>\n";

	int total = 0;

	for(i = 0; i < bidsNumber && total < quantity; i++){
		Bid current = bids.top();
		bids.pop();
		int itemNumber = current.getQuantity();
		total += itemNumber;

		if(total > quantity)//can not buy excessively
			itemNumber = itemNumber - (total - quantity);

		if(bidsNumber != 1)
			oss<<"<br>\t"<<i + 1<<".  ";//the bidder's sequence
		oss<<current.getEmail()<<" bid $"<<current.getAmount()<<" for each of "
			<<current.getQuantity()<<" items and is the higher bidder for "
			<<itemNumber<<" of them.<br>\n";
	}

	//the amount of items in the advertisement that have not been bid on.
	int unbidNumber = (quantity - total) > 0 ? (quantity - total) : 0;
	oss<<"<br>\n"<<unbidNumber<<" items remain unbid.<br>\n";	
}