函数中的Undef引用

Question

我为这类问题感到非常抱歉，我不久前就开始学习编码，通常无法轻松地发现容易的错误。

错误如下，也包含文件。我也想说，如果我将book.h的内容复制并粘贴到Bdynamic_array.h，请对book.cpp做同样的操作，并删除#include book.h行，我的程序可以使用“ make”进行编译。而且工作也很好。

错误

CMakeFiles/a.out.dir/Bdynamic_array.cpp.o: In function `BDynamicArray::shitleft(int, int)':
Bdynamic_array.cpp:(.text+0x381): undefined reference to `Book::operator=(Book&)'
CMakeFiles/a.out.dir/Bdynamic_array.cpp.o: In function `BDynamicArray::shitright(int, int)':
Bdynamic_array.cpp:(.text+0x456): undefined reference to `Book::operator=(Book&)'
CMakeFiles/a.out.dir/Bdynamic_array.cpp.o: In function `Book* std::__copy_move<false, false, std::random_access_iterator_tag>::__copy_m<Book*, Book*>(Book*, Book*, Book*)':
Bdynamic_array.cpp:(.text._ZNSt11__copy_moveILb0ELb0ESt26random_access_iterator_tagE8__copy_mIP4BookS4_EET0_T_S6_S5_[_ZNSt11__copy_moveILb0ELb0ESt26random_access_iterator_tagE8__copy_mIP4BookS4_EET0_T_S6_S5_]+0x40): undefined reference to `Book::operator=(Book&)'
CMakeFiles/a.out.dir/Blist.cpp.o: In function `BList::insert(int, Book)':
Blist.cpp:(.text+0x182): undefined reference to `Book::operator=(Book&)'
CMakeFiles/a.out.dir/Blist.cpp.o: In function `BList::add(Book)':
Blist.cpp:(.text+0x296): undefined reference to `Book::operator=(Book&)'
CMakeFiles/a.out.dir/Blist.cpp.o: In function `BList::listOut()':
Blist.cpp:(.text+0x34f): undefined reference to `operator<<(std::ostream&, Book const&)'

包含BDynamic_array.cpp

#include <iostream>
#include <string>
#include <sstream>
#include "book.h"
#include "Bdynamic_array.h"

using namespace std;

包括BDynamic_array.h

#include <iostream>
#include <string>
#include <sstream>
#include "book.h"

using namespace std;

包含Blist.h

#include "Bdynamic_array.h"

包含Blist.cpp

#include <iostream>
#include "Bdynamic_array.h"
#include "Blist.h"

Book.cpp

#include <iostream>
#include <string>
#include <sstream>
#include "book.h"

using namespace std;

ostream &operator<< (ostream &stream, const Book &book)
{
    stream << book.id << ": " << book.title << ", pages - " << book.pages << ", illustrstions - " << book.illustrations << ", number of characters - " << book.numberofCharacters;
    return stream;
}

Book& Book::operator=(Book &other)
{
    id = other.id;
    title = other.title;
    pages = other.pages;
    illustrations = other.illustrations;
    numberofCharacters = other.numberofCharacters;

    return other;
}

Book.h

#ifndef ____BBOOK__HJKIPU13

#define ____BBOOK__HJKIPU13

#include <iostream>
#include <string>
#include <sstream>

using namespace std;

struct Book {
    size_t id;
    string title;
    size_t pages;
    bool illustrations;
    size_t numberofCharacters;
    Book& operator=(Book& other);

    //ostream &operator<< (ostream &stream);
};

ostream &operator<< (ostream &stream, const Book &book);

#endif

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Answer 1

经过数小时无所事事，魔术已解决的问题由于某种原因，book.cpp无法编译，大约100次后，我尝试在终端中编写cmake ..它已构建并正常工作