的初始化没有匹配的构造函数

error: no matching constructor for initialization of

本文关键字:构造函数 初始化      更新时间:2023-10-16

我知道这个问题以前有人问过,但请哼唱我。我很难理解如何初始化一个类。

这是有问题的代码。

#include <iostream>
#include <fstream>
#include <string>
using namespace std;
//-------------------------------------------------------------------   ---------------------------
class Date                                                                  //Class Date
{
public:
    int day;
    int month;
    int year;
    Date();
    Date(int,int,int);
    ~Date(void);
};
Date::Date(void)
{
    day = 0;
    month = 0;
    year = 0;
}
Date::Date(int month, int day, int year)
{
    day = day;
    month = month;
    year = year;
}                                                                         //Class Date
//---------------------------------------------------------------------------------------------
                                                                    //Class Book
class Book
{
public:
    string _title;
    string _author;
    Date _published;
    string _publisher;
    float _price;
    string _isbn;
    int _page;
    int _copies;
    Book();
    Book(string,string,Date,string,float,string,int,int);
    ~Book(void);
};
Book::Book(void)
{
    _title = "";
    _author = "";
    //_published;
    _publisher = "";
    _price = 0;
    _isbn = "";
    _page = 0;
    _copies = 0;
}
Book::Book(string title, string author, Date published, string publisher, float price, string isbn, int page, int copies)
{
    _title = title;
    _author = author;
    _published = published;
    _publisher = publisher;
    _price = price;
    _isbn = isbn;
    _page = page;
    _copies = copies;
}                                                                           //Class Book
//---------------------------------------------------------------------------------------------
class Node                                                              //Class Node
{
    friend class LinkedList;
private:
    Book *_book;
    Node *_next;
public:
    Node(void);
    Node(Book*);
    Node(Book*,Node*);
    ~Node(void);
};
Node::Node(void)
{
    _book = NULL;
    _next = NULL;
}
Node::Node(Book *book)
{
    _book = book;
    _next = NULL;
}
Node::Node(Book *book, Node *next)
{
    _book = book;
    _next = next;
}                                                                       //Class Node
//---------------------------------------------------------------------------------------------
class LinkedList                                                        //Class LinkedList
{
private:
    Node *_head;
    Node *_tail;
public:
    LinkedList(void);
    LinkedList(Book*);
    ~LinkedList(void);
    void insert_front(Book*);
    void insert_rear(Book*);
    void print_list(void);
};
LinkedList::LinkedList(void)
{
    _head = NULL;
    _tail = NULL;
}

LinkedList::LinkedList(Book *book)
{
    _head = new Node(book);
    _tail = _head;
}                                                                       //Class LinkedList
//---------------------------------------------------------------------------------------------
void LinkedList::insert_front(Book *book)
{
    if(_head == NULL)
    {
        _head = new Node(book);
        _tail = _head;
    }
    else
        _head = new Node(book, _head);
}
void LinkedList::insert_rear(Book *book)
{
    if(_head == NULL)
    {
        _head = new Node(book);
        _tail = _head;
    }
    else
    {
        _tail -> _next = new Node(book);
        _tail = _tail -> _next;
    }
 }
void LinkedList::print_list(void)
{
    Node *temp = _head;
    while(temp!= NULL)
    {
        cout << temp -> _book -> _title << endl;
        cout << temp -> _book -> _author << endl;
        cout << temp -> _book -> _publisher << endl;
        temp = temp -> _next;
        cout << endl;
    }
}
LinkedList::~LinkedList(void)
{
}
//---------------------------------------------------------------------------------------------
                                                    //Main
int main(void)
{
    LinkedList myList;
    ifstream myFile("input.txt");
    string title;
    string author;
    Date published;         // was "Date published(int,int,int);"
    string publisher;
    float price;
    string isbn;
    int page;
    int copies;
    while(myFile)
    {
        getline(myFile,title);
        getline(myFile,author);
        //getline(myFile,published);
        getline(myFile,publisher);
        //getline(myFile,price);
        getline(myFile,isbn);
        //getline(myFile,page);
        //getline(myFile,copies);
        myList.insert_front(new     Book(title,author,published,publisher,price,isbn,page,copies));
    }
    myList.print_list();
    return 0;
}

我感兴趣的错误是:

assignment3.cpp:213:33:错误:没有匹配的初始化构造函数"书"……书(标题、作者、出版、出版人、价格、isbn、页面,复制));^    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~Assignment3.cpp:67:7:注意:候选构造函数不可行:未知第三个参数从'Date (int, int, int)'转换为'Date'Book::Book(字符串标题,字符串作者,出版日期,字符串出版…)^Assignment3.cpp:38:7:注:候选构造函数(隐式复制构造函数)不可行:需要1个参数,但提供了8个参数类的书^Assignment3.cpp:54:7:注意:候选构造函数不可行:需要0参数,但提供了8个书:本书(空白)^生成1个错误。

我做了建议的改变,现在我得到一个不同的错误:

架构x86_64的未定义符号:"Date::~Date()",引用自:Book::Book() in assignment3-0f3b1c.oBook::Book(std::__1::basic_string, std::__1::allocator>, std::__1::basic_string, std::__1::allocator>, Date, std::__1::basic_string, std::__1::allocator>, float, std::__1::basic_string, std::__1::allocator>, int, int) in assignment3-0f3b1c.o_main in assignment3-0f3b1c没有找到架构x86_64的Ld:符号Clang:错误:链接器命令失败,退出代码为1(使用-v查看调用)

下面是一个函数声明(published,取3个int,返回Date):

Date published(int,int,int)

你想创建一个变量:

Date published;

或者,如果你想明确表示你关心零初始化:

Date published{};