I found the way that works but it is not a correct solution.

When changing

Rules[this->RuleNum]->min->MembraneOut[0]=A.min.MembraneOut[0];


into a
...

Here Genome is creat6ed:

__fastcall TForm1::TForm1(TComponent* Owner)
: TForm(Owner)
{
Genome=new(RuleSet);

}

I've tracked it through a constructor - everything's OK.

watches also told me that in function in question
this = NULL

That's supposed to be a member function!

I just don't get it...

No It wouldn't.
Rules[SomeInt] is a class, not a pointer to one.

class Rule
{
public:
LivingCell min;
LivingCell max;
LivingCell IgnoredParametres;
int Action;
int Parameter;
};
// ------------------- Класс "Генотип" -----------------

Well I did like you told, but still it doesn't work.

And using watches I found that
RuleNum's value is ???? (four question marks
)

I've got an array of pointers to my class "Rule" Now I'm trying to access it from within a member function AddRule. But on the first line I keep getting "Memory Access Violation"

Can anyone tell...

I quite don't get it!

I've got a memory access violation on a perfectly normal code string. Error occurs when starting the application. I can click continiuse and everything goes on ok.
And more....