following the example from https://stackoverflow.com/a/3520629/5642268 which works nicely as it is.
Now i wanted to extend on it and property of the class type "User" inside the Impl and fill that propery inside the the Impl object like:
class Interface
{
public:
virtual void callback() = 0;
};
class User
{
private:
Interface& myCallback;
public:
User(Interface& newCallback) : myCallback(newCallback) { }
void DoSomething() { myCallback.callback(); }
};
class Impl : public Interface
{
private:
User * m_user = nullptr;
public:
Impl () {
m_user = new User (this);
// ====================
}
virtual void callback() { std::cout << "Hi from Impl\n"; }
User * get_userinfo () { return m_user; }
};
int main()
{
Impl impl;
impl.get_userinfo()->DoSomething();
}
The "this" should be replaced with something referencing the Impl object, I think, or the change could be somewhere else.
Compiling the above code i get the following error messages:
In member function 'Chain* Impl::testing(Chain*)':
error: no matching function for call to 'Chain::Chain(Impl*)'
Chain * x =new Chain(this);
note: candidate: Chain::Chain(Interface&)
Chain (Interface& newCallback) : myCallback(newCallback) { }
note: no known conversion for argument 1 from 'Impl*' to 'Interface&'
note: candidate: constexpr Chain::Chain(const Chain&)
class Chain {
note: no known conversion for argument 1 from 'Impl*' to 'const Chain&'
note: candidate: constexpr Chain::Chain(Chain&&)
note: no known conversion for argument 1 from 'Impl*' to 'Chain&&' exit status 1
no matching function for call to 'Chain::Chain(Impl*)'
Lots of notes that does not make sense to me on how to resolve the issue.
There must be a better way but i have no clue where to search for.
Any Help is welcome. Some ref's to documentation would also be a pre.
Finally i find some solution to this issue. this is a pointer to the object it self. To get the object you need to add a Asterisk before the "this" and now it compiles.
