c++ - double free or corruption (runs ok if reorder lines)

Use example in link, but change to use char * and vector:

#include 
using namespace std;

class Test{
    char *myArray;


public:
    Test(){
        myArray = new char[10];
    }

    ~Test(){
        delete[] myArray;
    }   
};  



int main(){
    vector q; // line 1
    Test t;         // line 2
    q.push_back(t);
}

It will cause double free or corruption error. However, if run line 2 before line 1, like:

Test t;
vector q;

Then it runs ok. Why is that?

Tested on Xubuntu 12.04 g++ 4.6.3.

Updated:

It's not duplicate question. I understand a copy constructor and an assignment operator are needed (it's already answered in the above link where the sample code is from). However, using int * or queue like that in the original link, but swapping line 1 and line 2, there is still error. Only using char *, and vector and swapping line 1 and line 2 will not cause error. My question is why is this particular case? Can anyone check it in your platform?