Error on comparison operators overload in C++ class

[michelleradu]

Error C2662: 'Event::GetTime' : cannot convert 'this' pointer from 'const Event' to 'Event &'.

This is my code:

#include <iostream>
#include <queue>
#ifndef Person_h
#define Person_h
#include "Person.h"
#endif 

using namespace std;

enum EventName
{
	_SendMessageToUserInterface, 
	_SetPNOld,
	_IntroduceInfection
};

class Event{
	int time;
	EventName name;
	Person person;
public:
	Event(int t, EventName n, Person p)
	{	
		time = t;
		name = n;
		person = p;
	}
	int GetTime()
	{
		return time;
	}
	Person GetPerson()
	{
		return person;
	}
	EventName GetName()
	{
		return name;
	}
	bool operator<(const Event& e) const 
	{
		return time < e.GetTime();
	}
	bool operator==(const Event& e) const 
	{
		return time == e.GetTime() && person == e.GetPerson() && name == e.GetName();
	}
};

The error shows on the return lines of the operators' overload methods. I need these overloads to build a set of Event objects.
I am not a very good C++ programmer (more into C#), I can understand what the error says but I do not know how to fix it. Thank you for any suggestion.

[michelleradu]

Got it: I had to make the getter methods constant. Thank you.