code. compile. run. debug. share.
Source Code
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#include <iostream>
#include "A.hpp"
int main() {
B b;
std::cout << b.bar(); // Works fine, prints 2
std::cout << b.foo(); // WORKS FINE, Prints 1
}
#pragma once
class A_data {
public:
int foo = 1;
virtual ~A_data() = default;
};
template <class C = A_data> class A {
public:
int foo() const; // Not implemented here
A() { d = new C; }
~A() { delete d; }
C* d;
};
class B_data : public A_data {
public:
int bar = 2;
virtual ~B_data() = default;
};
// Template here is in case something needs to inherit B, like in A.
template <class C = B_data> class B : public A<C> {
public:
int bar() const; // Not implemented here, just like A::foo.
};
#include "A.hpp"
//----------------vvvvvv---------------------------------->changed from A_data to B_data
template <> int A<B_data>::foo() const { return d->foo; }
template <> int B<B_data>::bar() const { return d->bar; }
Compiling Program...
Standard Input:
Interactive Console
Text
Program is not being debugged. Click "Debug" button to start program in debug mode.
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