costructor/destructor problem

[mickey]

hi, I coded this:

Ne::Ne():  {
	printf ("costructor \n");
	_w = new double[10];
}
 
Ne::~Ne() {
	printf ("destructor \n");
	delete[]  _w1;
 
}
class Lay {
		std::vector <Ne> _ne;
           ...............
}
//in main.cpp
lay._ne.resize(2); //here crash

Ne::Ne():  {
	printf ("costructor \n");
	_w = new double[10];
}

Ne::~Ne() {
	printf ("destructor \n");
	delete[]  _w1;

}
class Lay {
		std::vector <Ne> _ne;
           ...............
}
//in main.cpp
lay._ne.resize(2); //here crash

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I can see that when resize is called happen this:

costructor
destructor
destructor
        and crash......

costructor
destructor
destructor
        and crash......

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I wonder why does 'destructor' start? and 2 times? crash reason maybe can be destroy 2 times the same portion of memory.....but ....
thanks