Thread: Inheritance

This works for me:

Code:

class Base
{
public:
  void print() { }
};

class Derived : public Base
{

};

int main()
{  
    Derived d;
    d.print();
}

Please post actual code for actual help with actual code.

Originally Posted by warfang

MmmmmKay. I need to figure out what I need to post up because my program is close to 1500 lines with all the files together. Do you just want me to post all of it?

No, that's a bit long.

One good step in debugging is to start trimming away at the code until you're left with the problem. One way to do this is to #define some macro constant such as OOPS, or whatever, and do something like this:

Code:

#ifndef OOPS
/* code to 'remove' */
#endif

This is an after-the-fact method when you haven't done or had the opportunity to do incremental builds.

Well the derived and base classes aren't terribly long. I'll post the Derived first since I'm sure the problem is just in the Derived class. There's two derived classes to be exact and I did them both the same way.

EDIT: Took out Code, uploading files...

I see a few problems with your code, but I don't think I see the cause of your error.

Code:

CaseString::CaseString() : String(){

What is this "String"? CaseString is derived from "string," isn't it? Or is that a typo.

Code:

CaseString::~CaseString() : ~String(){

This shouldn't compile (as far as I know). And assuming the base class is "String" after all, then its destructor will be called implicitly when CaseString's destructor is called. (Note that CaseString's destructor is not guaranteed to be called if you forget to make String's destructor virtual)

Ah, looking at your other post I might just see the reason for your error:

Code:

//string.h
using namespace std;

Try removing that line and see if your error changes

Edit: And you'll have to explicitly qualify std::ostream (and possibly some others)

Glad to hear you've got it working. Don't miss my last point, though: this is a good reason to avoid "using namespace std;" At the very least, don't put it in a header file.