Help with Headers

[axeves]

Hi.

Can you explain to me on how to "inherit" (if that's the right word) stuff from a header file, and on how to write one? (A header file)

Like if i wrote this;

class Foo {

int a = 123;

}

in a header, how would i call it?

For example, how would i do this:

Foo(); //Calls the Foo class

Using classes was just an example.

[3hM2Nwbp]

I'm not sure what you mean by "inherit" - either you want to be able to use the header in another file - or polymorphically inherit from another class.

//ClassA.h
#ifndef CLASS_A_H
#define CLASS_A_H
class ClassA
{
    int a;
};
#endif 

//ClassB.h
#ifndef CLASS_B_H
#define CLASS_B_H

#include "ClassA.h" // <-- This macro is a glorified copy and paste of ClassA.h

class ClassB : public ClassA
{
    // ClassB "is a" ClassA
};

#endif 

// Main.cpp
#include "ClassA.h"
#include "ClassB.h"

int main(void)
{
    ClassA classA;
    ClassB classB;
    return 0;
}

[Breadman]

#include "ClassB.h" Just copies the whole content of the file to the file it's included in. :P