Overriding class methods

Hi, I am trying to override a class method from a child class like the
following:

class ParentClass
{
public:
    ParentClass();
         virtual ~ParentClass();
    virtual double someMethod (int)=0;
}

ParentClass::ParentClass()
{
  someMethod(1);
}

class childClass::public ParentClass
{
public:
    childClass(): ParentClass(){;}
    double someMethod(int);
}

double childClass::someMethod(int num)
{
  //do something meaningfull here
  return 0;
}

int main()
{
  childClass cld();
  return 0;
}

now, this program will crash because someMethod is called from the
ParentClass constructor.

If someMethod is called outside, e.g.

ParentClass::ParentClass()
{

}

and

int main()
{
  childClass cld();
  cld.someMethod();
  return 0;
}

it will work fine.
However, I want to be able to call the overriden method someMethod()
from the constructor. Is there a way around this problem?

Thank you
Vasileios

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