basic inherited or vector problem?

[mickey]

class Network {
	private:
		Layer lay;
        .....................
};
 
void Network::_create() {
	lay._ne->resize(10);
}
//lay.h
#include "ne.h"
#include <vector>
class Network;
class Lay {
	protected:
		std::vector <Ne>* _ne;
		friend Network;
	public:		
		Lay();
		~Lay();
};

class Network {
	private:
		Layer lay;
        .....................
};

void Network::_create() {
	lay._ne->resize(10);
}
//lay.h
#include "ne.h"
#include <vector>
class Network;
class Lay {
	protected:
		std::vector <Ne>* _ne;
		friend Network;
	public:		
		Lay();
		~Lay();
};

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Hi, I dont want use inherit for this program for my reasons.
Problems:
1. when resize is called program crash; I guess it happen because I'm working with vector of pointers...maybe they should be set to NULL (?). But how can I do this? Before resizing vector size is 0.....
2. when net.create() is executed; then why do I have to use 'class network, friend network'? (otherwise I can't access to member protected _ne). Wich is the reason? If I done a class as member I guess that I can do everything with that oblect.....
Are you understand?
Are there any other implementation of this ? (without inherit please)
thanks