Why would vector::size() give a garbage value ?

[kmkkra]

Hello to anyone who reads this, and a very good day to you.

OS: Windows 7
IDE: Code::Blocks
Status: novice C++ programmer

My problem is that myClass.size() is giving a garbage value
when it should be giving the value 2.

My problem is demonstrated below, but I don't know how to replicate the problem exactly. The program below pretty much demonstrates what I'm doing in my actual program. Also note that I checked myClass.empty() immediately after delete, and even though in my original program myClass.size() is giving a garbage value myClass.empty() returns false... So I geuss myClass - isn't - empty, and neither should it be.

And lastly my program crashes once I call myClass.erase()


My questions are:


1)What is wrong with my program?

2) I am expecting to delete the contents that the second pointer element points to. Am I doing my pointer arithmetic wrong?

#include <iostream>
#include "CMyClass.h"
#include <vector>
using namespace std;
 
int main()
{
    vector<CMyClass*> myClass;
    myClass.push_back(new CMyClass());
    myClass.push_back(new CMyClass());
 
    cout << "1) myClass.size() " << myClass.size() << "\n"; //This myClass.size() is cool, it gives 2
 
    vector<CMyClass*>::iterator it = myClass.begin() + 1;// I - think - this equals the second element
    delete *it;
 
    if (myClass.empty()) std::cout << "myClass is empty ya'll\n";
 
   cout << "2) myClass.size() " << myClass.size() << "\n";  //In my original program myClass.size() gives a garbage value
 
    myClass.erase(it);
 
    cout << "3) myClass.size() " << myClass.size();
 
    return 0;
}

As always, thank you so much to anyone who helps, and the best of wishes to all the gurus, and the members on CodeGuru.