使用自定义模板类时,编译出现错误:
error C2955: 'XXXX' : use of class template requires template argumen
原因:
如果是模板类,则该类的所有函数(不管有没用到模版参数)的实现都必须放在头文件中。
例如:
template <class K, class T> class KeyedCollection { public: // Create an empty collection KeyedCollection(); // Return the number of objects in the collection int size() const; void get_vectorone(); // Insert object of type T with a key of type K into the collection using an “ignore duplicates” policy void insert(const K&, const T&); // Output data value of objects in the collection, one data value per line friend ostream& operator<<(ostream& out, const KeyedCollection<K,T>& e){ for (int i = 0; i < e.key.size(); i++) { out << e.key.at(i); } return out; } private: vector<K> key; vector<T> object; }; template <class K, class T> KeyedCollection<K,T>::KeyedCollection(){} template <class K, class T> int KeyedCollection<K,T>::size() const { return key.size(); } template <class K, class T> void KeyedCollection<K,T>::insert(const K& id, const T& customer){ key.push_back(id); object.push_back(customer); }
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