I have a inheritance hierarchy that looks like this:
class Y { ... };
/* ================================================== */
class A
{
public:
A(ACfg* cfg);
};
class ACfg { ... };
/* ================================================== */
class B: virtual public A
{
public:
B(ACfg* cfg): A(cfg)
{}
};
/* ================================================== */
class C: virtual public A
{
public:
C(ACfg* cfg): A(cfg) {}
};
/* ================================================== */
template<typename T> class D<T>: public B
{
public:
D(ACfg* cfg);
private:
T member;
};
template<typename T>
D<T>::D(ACfg* cfg): B(cfg) {}
/* ================================================== */
class E: public C, public D<Y>
{
E(ACfg* cfg):
C(cfg), D<Y>(cfg) {}
^
};
/* ================================================== */
class F: public E
{
F(ACfg* cfg): E(cfg) {}
^
};
Class template D and its constructor implementation are both in the same header file.
In the with "^" marked places I get the compiler error: "no default constructor exists for class "A""
Now why would it need that one at all? Do I have to explicitly instantiate the D at some point?
What is my mistake?
In advance I want to thank you for all your help.
