问题描述
template <class T>struct Node{ T val; Node *next; Node(T &t){this->val = t;this->next = NULL; }};template <class T>class SingleList {public: SingleList(); ~SingleList(); void push_front(T &t);private: int m_nListCount; Node<T> *m_head;};template <class T>SingleList<T>::SingleList(){ m_head = NULL; m_nListCount = 0;}template <class T>SingleList<T>::~SingleList(){ Node<T> *p, *pNext; for (p = m_head; p != NULL ; p = pNext) {pNext = p->next;free(p); } m_nListCount = 0;}template <class T>void SingleList<T>::push_front(T &t){ Node<T> *pNode = (Node<T> *)malloc(sizeof(Node<T>)); if(NULL != pNode){pNode->val = t;pNode->next = m_head;m_head = pNode;m_nListCount++; }}
代码全部放在头文件中，但是使用Clion编译提示：error: ’Node’ is not a template type，求解答！
问题解答
回答1：用vs2015试了下，可以编译通过。但是在用g++在编译Node<T> *pNode = (Node<T> *)malloc(sizeof(Node<T>));这句时出现 error：there are no arguments to ’malloc’ that depend on a template parameter, so a declaration of ’malloc’ must be available [-fpermissive]
改成
Node<T> *pNode = new Node<T>();
就可以通过编译了（建议类和模板用new分配内存好一点，因为new可以自动调用默认的构造函数，还内置了sizeof、类型转换和类型安全检查功能)
但是没有因为Clion，不能试。。应该是编译器实现问题吧。。
回答2：template <class T>struct Node{
T val;Node<T> *next;Node(T &t){ this->val = t; this->next = NULL;}
};
