rror C2228: left of '.visitFile' must have class/struct/union type

rror C2228: left of '.visitFile' must have class/struct/union type

Visitor.h
class Visitor{
public:
virtual ~Visitor() {}
virtual void visitNode(Node*) = 0;
virtual void visitFile(File*) = 0;
virtual void visitDirectory(Directory*) = 0;
virtual void visitLink(Link*) = 0;
protected:
Visitor();
Visitor(const Visitor&);
};
//realize those visit function
void Visitor::visitNode(Node* n) {
//common default behavior
cerr << "It is not a directory! " << endl;
}
void Visitor::visitDirectory(Directory* d) {
Visitor::visitNode(d);
}
void Visitor::visitFile(File* f) {
Visitor::visitNode(f);
}
void Visitor::visitLink(Link* l) {
Visitor::visitNode(l);
}
File.h
class File : public Node {
public:
File();
//redeclare common interface here
void setName(string& name);
string& getName();
void setCDate(char* cDate);
char* getCDate();
long size();
virtual void accept(Visitor*) = 0;
private:
string& name;
char* cDate;
};
//realize the function accept
void File::accept(Visitor* v) {
v.visitFile(this);
}
The problem is the function accept(Visitor* v){}, my compiler always tell
me: d:\win7 data\data\c\filemanage\file.h(20) : error C2228: left of
'.visitFile' must have class/struct/union type How can I deal with it?