Q2.cpp

// ID/Name :B10530027 黃志仁
// Date:March 30.2017
// Last Update:March 30.2017
// Problem statement : Pointer-Advanced

#include <iostream>
#include <string>
#include <vector>
#include <sstream>

using namespace std;

class Pointer {
public:
	Pointer() {
		_vals = new vector<int>();
	}
	void Create(string, string);
	void Destroy();
	void Test();
	void Print();
	string GetName();
	void Same(Pointer p2);
	void Assign(Pointer p1);
	void newVal(int index, int newV);
private:
	string _name;
	vector<int> *_vals;	//all the value of one Pointer object, use pointer for easy to assign
	string _assignTo;	//the name this Pointer assign to
};

//Create a Pointer object
void Pointer::Create(string name, string val) {
	_name = name;

	istringstream ss(val);
	int oneVal;

	//push all the values in vals into _vals
	while (ss >> oneVal) _vals->push_back(oneVal);

	//initialize _assignTo
	_assignTo = _name;
}

//destroy a Pointer to let it become NULL
void Pointer::Destroy() {
	if (_vals->size() != 0) {//is null?
		cout << "Destroying Pointer";
		this->Print();	//print all values
		_vals->clear();	//clear _vals vector
		_assignTo = "";	//clear _assignTo
	}
	else {
		cout << "Null Pointer" << endl;
	}
}

//Test Pointer is null or not
void Pointer::Test() {
	cout << ((_vals->size() == 0) ? 0 : 1) << endl;
}

//just print all values
void Pointer::Print() {
	if (_vals->size() != 0) {
		cout << "(value=";
		for (std::vector<int>::iterator i = _vals->begin(); i != _vals->end(); ++i) {
			cout << *i << (i == _vals->end() - 1 ? ")\n" : ",");
		}
	}
	else
		cout << "Null Pointer" << endl;
}

//return name of one Pointer
string Pointer::GetName() {
	return _name;
}

//assign p1 to this Pointer
void Pointer::Assign(Pointer p1) {
	this->Destroy();
	this->_assignTo = p1._assignTo;	//change assign target
	this->_vals = p1._vals;			//change _vals
}

//is p2 assign to the same target with this Pointer?
void Pointer::Same(Pointer p2) {
	if (_assignTo == p2._assignTo && _assignTo != "")cout << 1 << endl;
	else cout << 0 << endl;
}

//modify new value for _vals[index] in this Pointer
void Pointer::newVal(int index, int newV) {
	if (index >= _vals->size()) cout << "Out Of Range" << endl;
	else if (_vals->size() == 0) cout << "Null Pointer" << endl;
	else _vals->at(index) = newV;
}

int main() {
	vector<Pointer> ptrV;	//a vector to store Pointers
	string cmd, name, val, name1, name2;
	while (cin >> cmd) {
		//Create Name Value(s)
		if (cmd == "Create") {
			cin >> name;
			getline(cin, val);
			vector<Pointer>::iterator i;
			for (i = ptrV.begin(); i != ptrV.end(); i++) {
				if (name == i->GetName()) {
					i->Create(name, val);
					break;
				}
			}
			if (i == ptrV.end()) {
				Pointer tmp;
				tmp.Create(name, val);
				ptrV.push_back(tmp);
			}
		}

		//Destroy Name
		if (cmd == "Destroy") {
			cin >> name ;
			vector<Pointer>::iterator i;
			for (i = ptrV.begin(); i != ptrV.end(); i++) {
				if (name == i->GetName()) {
					i->Destroy();
					break;
				}
			}
			if (i == ptrV.end())
				cout << "Not Found" << endl;
		}

		//Test Name
		if (cmd == "Test") {
			vector<Pointer>::iterator i;
			cin >> name ;
			for (i = ptrV.begin(); i != ptrV.end(); i++) {
				if (name == i->GetName()) {
					i->Test();
					break;
				}
			}
			if (i == ptrV.end())cout << "Not Found" << endl;
		}

		//Print Name
		if (cmd == "Print") {
			vector<Pointer>::iterator i;
			cin >> name;
			for (i = ptrV.begin(); i != ptrV.end(); i++) {
				if (name == i->GetName()) {
					i->Print();
					break;
				}
			}
			if (i == ptrV.end()) cout << "Not Found" << endl;
		}

		//Assign Name1 Name2
		if (cmd == "Assign") {
			cin >> name1 >> name2;
			vector<Pointer>::iterator i1, i2;
			int found = 0;
			for (i1 = ptrV.begin(); i1 != ptrV.end(); i1++) {
				if (name1 == i1->GetName()) {
					found++;
					break;
				}
			}
			for (i2 = ptrV.begin(); i2 != ptrV.end(); i2++) {
				if (name2 == i2->GetName()) {
					found++;
					break;
				}
			}
			if (found == 2) {
				i2->Assign(*i1);
			}
			else {
				while (found--)cout <<  "Not Found" << endl;
			}
		}

		//Same Name1 Name2
		if (cmd == "Same") {
			cin >> name1 >> name2;
			vector<Pointer>::iterator i;
			int found = 0;
			Pointer p1, p2;
			for (i = ptrV.begin(); i != ptrV.end(); i++) {
				if (name1 == i->GetName()) {
					p1 = *i;
					found++;
				}
				else if (name2 == i->GetName()) {
					p2 = *i;
					found++;
				}
			}
			if (found == 2) {
				p1.Same(p2);
			}
			else {
				while (found--)cout <<  "Not Found" << endl;
			}
		}

		//At Name Index NewValue
		if (cmd == "At") {
			int ind, newValue;
			cin >> name >> ind >> newValue;
			vector<Pointer>::iterator i;
			for (i = ptrV.begin(); i != ptrV.end(); i++) {
				if (name == i->GetName()) {
					i->newVal(ind, newValue);
					break;
				}
			}
			if (i == ptrV.end()) cout << "Not Found" << endl;
		}

		if (cmd == "Exit") return 0;
	}
}