vector :: push_back vs vector :: operator []

Question

Jun 13, 2012, 03:23 AM

c++stl operator-keyword push-back vector

vector :: push_back vs vector :: operator []

Abajo enc++ programa,

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

int main()
{
     vector<int> numbers;

    numbers.push_back(2);
    numbers.push_back(10);
    numbers.push_back(5);
    numbers.push_back(3);
    numbers.push_back(7);

    numbers[3] = 8;
    numbers[5] = 11;

    for(int i=0; i<numbers.size(); ++i)
    {
            cout<<" "<<numbers[i];
    }
}

verlo enideone.

aquí,numbers[3] esta trabajando peronumbers[5].
Parece que, vector :: operator [] no aumenta el tamaño de vector como vector :: push_back.
asi que,¿Es esta la única diferencia entre estos dos o algo más??