我不知道代码有什么问题，但在 visual studio 中不断收到这些错误消息。

Error 18 error C1903: unable to recover from previous error(s); 29
Error 15 error C2039: 'Node' : is not a member of '`global namespace'' 23
Error 6 error C2039: 'node_count' : is not a member of '`global namespace'' 13
Error 5 error C2039: 'node_count_' : is not a member of '`global namespace'' 10
Error 3 error C2059: syntax error : '<' 
Error 13 error C2059: syntax error : '<' 23
Error 11 error C2086: 'int CS170::List' : redefinition 23
Error 7 error C2143: syntax error : missing ';' before '{' 14
Error 1 error C2143: syntax error : missing ';' before '<' 10
Error 9 error C2143: syntax error : missing ';' before '<' 23
Error 8 error C2447: '{' : missing function header (old-style formal list?) 14
Error 17 error C2588: '::~Node' : illegal global destructor 29
Error 2 error C2988: unrecognizable template declaration/definition 10
Error 12 error C2988: unrecognizable template declaration/definition 23
Error 4 error C3083: 'Node': the symbol to the left of a '::' 10
Error 14 error C3083: 'Node': the symbol to the left of a '::' must be a type 23
Error 16 error C3083: 'Node': the symbol to the left of a '::' must be a type 29
Error 10 error C4430: missing type specifier - int assumed. Note: C++ does not support default-int 23

这是头文件；

////////////////////////////////////////////////////////////////////////////////
#ifndef LIST_H
#define LIST_H
////////////////////////////////////////////////////////////////////////////////

#include  /* ostream, endl */

namespace CS170
{
    template  class List;

    template 
    std::ostream & operator<<(std::ostream & os, const List &list);

    template 
    class List
    {
    công cộng:
        // Default constructor
        List(void);

        // Copy constructor for constructing a list from an existing list
        List(const List &list);

        // Construct a list from a T array
        List(const T *array, int size);

        // Destructor
        ~List(void);

        void push_front(const T& Value); // adds the item to the front of the list
        void push_back(const T& Value); // adds the item to the end of the list
        void pop_front(void); // removes the first item in the list
        T front(void) const; // retrieves the first item in the list
        int size(void) const; // returns the number of items in the list
        bool empty(void) const; // true if empty, else false
        void clear(void); // clears the list

        // Overloaded assignment operator (=) for assigning one list to another
        List& operator=(const List &list);

        // Overloaded addition operator (+) for adding two lists
        List operator+(const List &list) const;

        // Overloaded addition/assignment (+=) for adding to a list "in place"
        List& operator+=(const List &list);

        // Overloaded subscript operators
        const T& operator[](int index) const;
        T& operator[](int index);

        // Output operator for printing lists (<<)
        friend std::ostream & operator<<  (std::ostream & os, const List &list);

        // Returns the number of Nodes that have been created
        static int node_count(void);

    riêng tư:
        // Used to build the linked list
        struct Node
        {
            Node *next; // pointer to the next Node
            T data; // the actual data in the node
            Node(T value); // non-default constructor (conversion)
            ~Node(void); // destructor
            static int node_count_; // number of Nodes created
        };

        Node *head_; // pointer to the head of the list
        Node *tail_; // pointer to the last node
        int size_; // number of items on the list

        // All nodes are created in this method
        Node *new_node(const T& data) const;
    };

} // namespace CS170

#include "List.cpp"

#kết thúc nếu
////////////////////////////////////////////////////////////////////////////////

这是cpp文件；

namespace CS170
{

    // static members

    template 
    int List::Node::node_count_ = 0;

    template 
    int List::node_count(void)
    {
        return Node::node_count_;
    }


    // List::Node methods
    template 
    List::Node::Node(T value) : data(value)
    {
        node_count_++;
    }

    template 
    List::Node::~Node(void)
    {
        node_count_--;
    }

    // public methods

    template 
    void List::clear(void)
    {
        while (!empty())
            pop_front();
    }

    // private methods

    template 
    typename List::Node *List::new_node(const T& data) const
    {
        Node *node = new Node(data); // create the node
        node->next = 0; // no next pointer yet
        return node;
    }

} // namespace CS170


// non-members

#include 

template 
std::ostream &CS170::operator<<(std::ostream & os, const CS170::List &list)
{
    // Start at the top
    typename CS170::List::Node *pnode = list.head_;

    // Print each item
    while (pnode != 0)
    {
        os << std::setw(4) << pnode->data;
        pnode = pnode->next;
    }
    os << std::endl;
    return os;
}

谢谢...

1 Câu trả lời

struct Node0 应该是 struct Node.

关于c++ - “节点”不是全局命名空间的成员？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/5506419/