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Why won't code from this tutorial work?

Calibrohawk (4)
I've been following a tutorial series by MakingGamesWithBen and have had no issues so far other than pointers not working. This is probably because he uses the Win32 platform and I'm on the x64 platform. Problem is I have no clue how to fix the issues with the pointers because I'm still trying to understand them. I'm almost certain I followed the video 100%. So what is the issue?

Source.cpp:
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  #include <iostream>
#include <string>
#include <vector>
#include <cstdio>
#include <cstdlib>

#include "DialogueTree.h"

using namespace std;

int main() {

	DialogueTree dialogueTree;

	dialogueTree.init();

	int rv = dialogueTree.performDialogue;

	if (rv == 1) {
		cout << "The end." << endl;
	}

	dialogueTree.destroyTree();

	system("PAUSE");
	return 0;
}


DialogueTree.cpp
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#include "DialogueTree.h"

DialogueNode::DialogueNode(string Text) {
	text = Text;
}

DialogueOption::DialogueOption(string Text, int ReturnCode, DialogueNode *NextNode) {
	text = Text;
	returnCode = ReturnCode;
	nextNode = NextNode;
}

DialogueTree::DialogueTree() {

}

void DialogueTree::init() {

	DialogueNode *node0 = new DialogueNode("Hello brave warrior!");
	DialogueNode *node1 = new DialogueNode("I don't want to talk to you");
	DialogueNode *node2 = new DialogueNode("I have a quest for you!");
	DialogueNode *node3 = new DialogueNode("You will get 5 gold you swine.");
	DialogueNode *node4 = new DialogueNode("Collect ten dandilions.");

	node0->dialogueOptions.push_back(DialogueOption("Sup noob!", 0, node1));
	node0->dialogueOptions.push_back(DialogueOption("Hello strange voice!", 0, node2));
	dialogueNodes.push_back(node0);

	node1->dialogueOptions.push_back(DialogueOption("Aww.", 0, nullptr));
	dialogueNodes.push_back(node1);

	node2->dialogueOptions.push_back(DialogueOption("K bye.", 0, nullptr));
	node2->dialogueOptions.push_back(DialogueOption("What is it?", 0, node4));
	node2->dialogueOptions.push_back(DialogueOption("What's the pay?.", 0, node3));
	dialogueNodes.push_back(node2);

	node3->dialogueOptions.push_back(DialogueOption("Ok what is it?", 0, node4));
	node3->dialogueOptions.push_back(DialogueOption("That sucks I'm out.", 0, nullptr));
	dialogueNodes.push_back(node3);

	node4->dialogueOptions.push_back(DialogueOption("Let's do it!", 1, nullptr));
	node4->dialogueOptions.push_back(DialogueOption("No way.", 0, nullptr));
	dialogueNodes.push_back(node4);


}

void DialogueTree::destroyTree() {

	for (int i = 0; i < dialogueNodes.size(); i++) {
		delete dialogueNodes[i];
	}
	dialogueNodes.clear();

}

int DialogueTree::performDialogue() {
	if (dialogueNodes.empty) {
		return -1;
	}

	DialogueNode *currentNode = dialogueNodes[0];

	while (true) {
		cout << currentNode->text << endl << endl;

		for (int i = 0; i < currentNode->dialogueOptions.size(); i++) {
			cout << i + 1 << ": " << currentNode->dialogueOptions[i].text << endl;
		}
		cout << endl;
		int input;
		cin >> input;
		input--;

			if (input < 0 || input >= currentNode->dialogueOptions.size()) {
				cout << "Invalid input." << endl;
			}
			else {

				if (currentNode->dialogueOptions[input].nextNode == nullptr) {
					return currentNode->dialogueOptions[input].returnCode;
				}

				currentNode = currentNode->dialogueOptions[input].nextNode;
				
			}
			cout << endl;
	}

	return 0;

}


DialogueTree.h
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#pragma once
#include <iostream>
#include <string>
#include <vector>

using namespace std;

class DialogueNode;

class DialogueOption {
public:
	DialogueOption(string Text, int ReturnCode, DialogueNode *NextNode);
	string text;
	int returnCode;
	DialogueNode *nextNode;
};

class DialogueNode {
public:
	string text;
	DialogueNode(string text);
	vector <DialogueOption> dialogueOptions;
};

class DialogueTree
{
public:
	DialogueTree();
	
	void init();
	void destroyTree();

	int performDialogue();

private:
	vector <DialogueNode *> dialogueNodes;
};
Peter87 (11179)
The errors I spot at first glance are the missing parentheses that are necessary in order to call the functions on line 17 in Source.cpp and on line 58 in DialogueTree.cpp.

 
 
int rv = dialogueTree.performDialogue();

 
 
if (dialogueNodes.empty()) {
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