| Initializing inherited protected Members of superclass [message #17401] |
Sun, 07 October 2007 13:09  |
 durgadeep
Messages: 1
Registered: October 2007 |
Junior Member |
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I have the following program. It has two classes Species and its sub
class NajaNaja. Now I am trying to do this,
The following gives me an error.
NajaNaja::NajaNaja(int age, int weight, KINDOF KINDOF): Species(age),
TypeOf(KINDOF), Heavy(weight)
{
std::cout << "NajaNaja(int, int, KINDOF) constructor...\n";
}
The following works if I do
NajaNaja::NajaNaja(int age, int weight, KINDOF KINDOF): Species(age),
TypeOf(KINDOF)
{
Heavy = weight;
std::cout << "NajaNaja(int, int, KINDOF) constructor...\n";
}
Why is there such a restriction ?
## PROGRAM BEGIN ###
#include <iostream>
enum KINDOF { COBRA, PYTHON, RATTLESNAKE };
class Species
{
public:
// constructors
Species();
Species(int age);
~Species();
//accessors
int HowOld() const { return Age; }
void SetOld(int age) { Age = age; }
int GetWeight() const { return Heavy; }
void SetWeight(int weight) { Heavy = weight; }
//Other methods
void Hiss() const { std::cout << "Species sound!\n"; }
void Snore() const { std::cout << "shhh. I'm Snoreing.\n"; }
protected:
int Age;
int Heavy;
};
class NajaNaja : public Species
{
public:
// Constructors
NajaNaja();
NajaNaja(int age);
NajaNaja(int age, int weight);
NajaNaja(int age, KINDOF kindof);
NajaNaja(int age, int weight, KINDOF kindof);
~NajaNaja();
// Accessors
KINDOF GetKINDOF() const { return TypeOf; }
void SetKINDOF(KINDOF kindof) { TypeOf = kindof; }
// Other methods
void WagTail() { std::cout << "Tail wagging...\n"; }
void BegForFood() { std::cout << "Begging for food...\n"; }
private:
KINDOF TypeOf;
};
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| Re: Initializing inherited protected Members of superclass [message #17402 is a reply to message #17401 ] |
Sun, 07 October 2007 13:15  |
alfps
Messages: 315
Registered: July 2007 |
Senior Member |
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* durgadeep@gmail.com:
> I have the following program. It has two classes Species and its sub
> class NajaNaja. Now I am trying to do this,
>
> The following gives me an error.
>
> NajaNaja::NajaNaja(int age, int weight, KINDOF KINDOF): Species(age),
> TypeOf(KINDOF), Heavy(weight)
> {
> std::cout << "NajaNaja(int, int, KINDOF) constructor...\n";
> }
You can't initialize a member of a base class in the initializer list.
But you can initialize the base class (calling its constructor).
Cheers, & hth.,
- Alf
--
A: Because it messes up the order in which people normally read text.
Q: Why is it such a bad thing?
A: Top-posting.
Q: What is the most annoying thing on usenet and in e-mail?
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