C++ reference in base class constructor

Question

I have a logic in base class constructor. The result of the logic has to be captured in the derived class constructor in a temporary variable. Is there a way to do it?

For example

class Base
{
   Base() { int temp_value = some_logic;  } 
};

class Derived : public Base
{
    Derived() { // need the temp value here.. }
};

Thanks, Gokul.

Answer 1

I guess the easiest way I can think of would be to just separate some_logic into it's own method...

class Base
{
    Base() { int temp_value = initializationLogic();  }
    int initializationLogic(){ return some-logic;}
};

class Derived : public Base
{
    Derived() { int temp_value_here_too = initializationLogic(); }
};

Answer 2

Either:

class Base 
{ 
   protected int not_so_temp_value;
   Base() { not_so_temp_value = some_logic_result;  }  
}; 

class Derived : public Base 
{ 
    Derived() { // read the not_so_temp_value member here.. } 
};

Or:

class Base 
{ 
   Base(int some_logic_result) { int temp_value = some_logic;  }  
}; 

class Derived : public Base 
{ 
    static Derived* create()
    {
       int some_logic_result = some_logic;
       return new Derived(some_logic_result);
    }
    Derived(int some_logic_result) : Base(some_logic_result)
    { // use the some_logic_result here.. } 
}; 

Answer 3

This is the one i am planning to use

class Base 
{ 
   Base(int& some_logic_result) { some_logic_result = some_logic;  }  
}; 

class Derived : public Base 
{ 
    Derived(int some_logic_result = 0) : Base(some_logic_result)
    { // use the some_logic_result here.. } 
}; 

Thanks, Gokul.