map/multimap的实例

朴灿烈づ我的快乐病毒、 2022-08-09 05:22 156阅读 0赞

**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**