C ++，矢量对象

Question

I wanna store objects on vectors. But I do not know why it does not work.

‪#‎include‬ <iostream>
#include <vector>
using namespace std;

I have a Persona class in the Persona.h file. And it only has two method: The default constructor and a method called mensaje(), both are public and it does not have any private member.

#include "Persona.h"

int main()
{
    vector<Persona> personas;
    Persona persona1;
    Persona persona2;

    personas.push_back(persona1);
    personas.push_back(persona2);

    vector<Persona>::const_iterator p;

    for(p = personas.begin(); p <= personas.end(); p++) {

Here is where I get the error message

        p.mensaje();
    }
}

I think problem is the way that I am trying to call 'p'. Is right that I try to use const_iterator instead of any other type?

Answer 1

p is iterator not object itself, you need to dereference it:

(*p).mensaje();

OR

p->mensaje();

And

update:

for(p = personas.begin(); p <= personas.end(); p++) {

to:

for(p = personas.begin(); p != personas.end(); p++) {
                          ^^^^^^

Answer 2

You are trying to call a non-const method on a const object (the object referenced by a const iterator). Since the mensaje() method does not modify the object, it should be declared const, like so:

void Persona::mensaje() const;

After you make this change, you should be able to call the method on the const object (reference) returned from the const iterator.

(...in addition to the other syntax errors mentioned in other answers.)