Question

I need to send method as parameter (MS Visual Studio 2008):

void Apply(Node<string>* node, void (visit(TreeEditor* self, Node<string> *)))

but this error occurs:

error C2664: ‘TreeEditor::Apply’ : cannot convert parameter 2 from ‘void (__thiscall TreeEditor::* )(TreeEditor *,Node *)’ to ‘void (__cdecl *)(TreeEditor *,Node *)’ d:\ed7\saod\labs\oopkkrtree\treeeditor\treeeditor.h 74

I tried to use this type:

void Apply(Node<string>* node, void(__thiscall TreeEditor::*)(TreeEditor *,Node<string> *))

and now it works, but I don’t know how to specify the name of the parameter (for ex: void(func(int)))

I can’t send static method.

I tried to do this:

void Apply(Node<string>* node, void(visit)(__thiscall TreeEditor::*)(TreeEditor *,Node<string> *))
void Apply(Node<string>* node, void(visit(__thiscall TreeEditor::*)(TreeEditor *,Node<string> *)))
void Apply(Node<string>* node, void(__thiscall TreeEditor::*)(visit(TreeEditor *,Node<string> *)))

but it didn’t work.
Please help me.

Answer 1

The name goes after the *:

void Apply(Node<string>* node, void(TreeEditor::*visit)(TreeEditor *,Node<string> *))

The __thiscall is unnecessary and will only work on Visual C++ (IIRC). Also you’ll need to pass or otherwise appropriate a TreeEditor to call the method on.

I would also recommend providing a typedef for that callback type:

typedef void(TreeEditor::*TreeEditorVisitor)(TreeEditor*, Node<string>*);

Then you can write Apply like this:

void Apply(Node<string>* node, TreeEditorVisitor visit)