c++ - 我正在编码 Node 结构，我认为这是构造函数初始化错误

Question

我正在编写 struct Node 代码，我认为这是构造函数初始化错误。我写错了什么？

class linkedlist 
{
private:
    struct Node
    {
        char m_num;
        char m_logo;
        char m_name;
        char m_1;
        int m_2;
        Node* next;
    };
    Node() 
        : m_num(), m_logo(), m_name(), m_1(), m_2(), next(nullptr) // error: expected unqualified-id before ')' token|
    {}
    Node(const char& a, const char& b, const char& c, const char& d, const int& e) 
        : m_num(a), m_logo(b), m_name(c), m_1(d), m_2(e), next(nullptr) // error: expected unqualified-id before 'const'|
    {}                                                                  // error: expected ')' before 'const'| 

    Node* head = nullptr;
    Node* tail = nullptr;

Answer 1

您需要将 Node 构造函数移到 Node 类的定义中。

struct Node
{
    char m_num;
    char m_logo;
    char m_name;
    char m_1;
    int m_2;
    Node* next;
    Node() 
        : m_num(), m_logo(), m_name(), m_1(), m_2(), next(nullptr)
    {}
    Node(const char& a, const char& b, const char& c, const char& d, const int& e) 
        : m_num(a), m_logo(b), m_name(c), m_1(d), m_2(e), next(nullptr)
    {}
};

或者您需要事先在 Node 类定义中声明构造函数。