我已经分配了以下模板:
#include <map>
template <typename T>
class Catalog {
struct Item {
//..
};
std::map<int, Item*> items;
public:
Catalog(void);
Catalog(const Catalog&);
~Catalog(void);
bool IsEmpty(void) const;
int Size() const;
void Add(T*);
T* Remove(T*);
T* Find(T*);
typedef void (T::*pFunc) (const T&);
void Inspection(pFunc) const;
};
接下来,有一个抽象的Product类和三个子类:
class Product {
protected:
unsigned int _id;
string _name;
public:
Product(const int& id, const string& name) : _id(id), _name(name) {};
virtual void Action(const Product& p) = 0;
virtual int hashCode() {
return _id*100;
};
unsigned int getId(void) const {return _id;};
string getName(void) const {return _name;};
};
class ProductA : public Product {
public:
ProductA(const int& id, const string& name) : Product(id, name) {};
virtual void Action(const Product& p) {
cout << "ahoj" << endl;
};
};
最后,处理Catalog实例的类ProductsCatalog:
class ProductsCatalog {
Catalog<Product> catalog;
public:
//..
void CatalogInspection(void) const {
catalog.Inspection(&Product::Action);
}
};
我遇到的问题是检查方法:
template <typename T> void Catalog<T>::Inspection(pFunc p) const {
for (std::map<int, Item*>::const_iterator it=items.begin(); it!=items.end(); ++it) {
it->second->Product->*p(*(it->second->Product));
}
};
我收到以下错误:
error C2064: term does not evaluate to a function taking 1 arguments
我已经尝试了我能想到的一切,没有成功。以下按预期工作,但显然不够抽象:
it->second->Product->Action(*it->second->Product);
答案 0 :(得分:2)
(it->second->Product->*p)(*(it->second->Product));
用于调用方法?
线程Calling C++ class methods via a function pointer似乎是相关的。