map/multimap的实例

最新推荐文章于 2025-09-14 18:57:23 发布

原创最新推荐文章于 2025-09-14 18:57:23 发布 · 359 阅读

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本文介绍了一个简单的银行账户管理系统的设计与实现。系统使用 C++ 编写，通过 map 存储银行账户信息，提供了添加、删除、查找账户等功能，并支持数据库合并操作。

map





class BankAccount
{
public:
	BankAccount(int acctNum,const string& name):mAcctNum(acctNum),mClientName(name) {}
	void setAcctNum(int acctNum) { mAcctNum = acctNum; }
	int getAcctNum() const { return mAcctNum; }
	void setClientName(const string& name) { mClientName = name; }
	string getClientName() const { return mClientName; }

protected:
	int mAcctNum;
	string mClientName;

};

class BankDB
{
public:
	BankDB() {}
	bool addAccount(const BankAccount& acct);
	void deleteAccout(int acctNum);
	BankAccount& findAccount(int acctNum) throw(out_of_range);
	BankAccount& findAccount(const string& name) throw(out_of_range);
	void mergeDatabase(BankDB& db);

protected:
	map<int,BankAccount> mAccounts;
};
bool BankDB::addAccount(const BankAccount& acct)
{
	pair<map<int,BankAccount>::iterator, bool> res;
	res = mAccounts.insert(make_pair(acct.getAcctNum(),acct));
	return res.second;
}
void BankDB::deleteAccout(int acctNum)
{
	mAccounts.erase(acctNum);
}

BankAccount& BankDB::findAccount(int acctNum) throw(out_of_range)
{
	map<int, BankAccount>::iterator it = mAccounts.find(acctNum);
	if (it == mAccounts.end()) {
		throw (out_of_range("No account with that number."));
	}
	return it->second;
}

BankAccount& BankDB::findAccount(const string& name) throw(out_of_range)
{
	for (map<int,BankAccount>::iterator it = mAccounts.begin(); it != mAccounts.end(); ++it)
	{
		if (it->second.getClientName() == name) {
			return it->second;
		}
	}
	throw out_of_range("No account with that name.");
}

void BankDB::mergeDatabase(BankDB& db)
{
	mAccounts.insert(db.mAccounts.begin(), db.mAccounts.end());
	db.mAccounts.clear();
}

multimap