C++ 对“librarymanager::getBook”的未定义引用(标准::基本字符串<;字符,标准::字符特征<;字符>;,标准::分配器<;字符>;)
嗨,我面临着“对`librarymanager::getBook(std::basic_string,std::allocator>)的未定义引用”的问题,尽管我花了很多时间来解决这个问题。我的代码如下 图书馆经理C++ 对“librarymanager::getBook”的未定义引用(标准::基本字符串<;字符,标准::字符特征<;字符>;,标准::分配器<;字符>;),c++,string,C++,String,嗨,我面临着“对`librarymanager::getBook(std::basic_string,std::allocator>)的未定义引用”的问题,尽管我花了很多时间来解决这个问题。我的代码如下 图书馆经理 #ifndef LIBRARYMANAGER_H #define LIBRARYMANAGER_H #include <string> #include "Book.h" namespace librarymanager { class LibraryManage
#ifndef LIBRARYMANAGER_H
#define LIBRARYMANAGER_H
#include <string>
#include "Book.h"
namespace librarymanager {
class LibraryManager {
public:
void addBook(const book::Book& book);
void removeBook(std::string bookName);
void markBarrowed(std::string bookName, std::string borrower);
void printAllBooks();
void printAllBorrowedBooks();
void printAllBorrowerDetails();
};
book::Book& getBook(std::string bookName);
}
#endif
#ifndef LIBRARYMANAGER_H
#define LIBRARYMANAGER_H
#include <string>
#include <map>
#include "Book.h"
namespace librarymanager {
class LibraryManager {
public:
void addBook(const book::Book& book);
void removeBook(std::string bookName);
void markBarrowed(std::string bookName, std::string borrower);
void printAllBooks();
void printAllBorrowedBooks();
void printAllBorrowerDetails();
private:
typedef std::map<std::string, book::Book> Books;
Books shelf;
};
book::Book getBook(std::string bookName);
}
#endif
Book.cpp
#include <iostream>
using namespace librarymanager;
LibraryManager::class Book {
private:
string bookName;
bool borrowed;
string borrower;
public:
Book(string bookName) {
this->bookName = bookName;
}
string getBookName() {
return bookName;
}
void setBorrowed(bool borrowed, string borrower) {
if (borrowed == true) {
this->borrowed = borrowed;
this->borrower = borrower;
}
}
bool isBorrowed() {
return borrowed;
}
string getBorrower() {
return borrower;
}
};
#include <iostream>
#include "Book.h"
using namespace book;
Book::Book(std::string bookName) {
this->bookName = bookName;
}
std::string Book::getBookName() const {
return bookName;
}
void Book::setBorrowed(bool borrowed, std::string borrower) {
if (borrowed == true) {
this->borrowed = borrowed;
this->borrower = borrower;
}
}
bool Book::isBorrowed() {
return borrowed;
}
std::string Book::getBorrower() {
return borrower;
}
#包括
使用名称空间库管理器;
图书馆管理员::课程手册{
私人:
字符串书名;
布尔借来的;
借款者;
公众:
图书(字符串图书名称){
此->书名=书名;
}
字符串getBookName(){
返回书名;
}
无效借项(bool借项、字符串借项){
如果(借用==真){
本->借用=借用;
该->借款人=借款人;
}
}
布尔是借用的{
归还借款;
}
字符串getbooker(){
归还借款人;
}
};
LibraryManagerTest.cpp
#include <iostream>
#include "LibraryManager.h"
#include "Book.h"
using namespace std;
using namespace librarymanager;
using namespace book;
int main() {
int operation = -1;
LibraryManager libraryManager;
while(true) {
cout << "Select operation " << endl;
cout << "1. Add Book" << endl;
cout << "2. Remove Book" << endl;
cout << "3. Borrow Book" << endl;
cout << "4. Print All Books " << endl;
cin >> operation;
switch (operation) {
case 1:
cout << "Enter the name of the book " << endl;
string bookName;
getline(cin, bookName);
book::Book& newBook = getBook(bookName);
libraryManager.addBook(newBook);
break;
/*case 2:
break;
case 3:
break;
case 4:
break;
default:
break;*/
}
}
}
#include <iostream>
#include "LibraryManager.h"
#include "Book.h"
using namespace std;
using namespace librarymanager;
using namespace book;
int main() {
int operation = -1;
LibraryManager libraryManager;
while(true) {
cout << "Select operation " << endl;
cout << "1. Add Book" << endl;
cout << "2. Remove Book" << endl;
cout << "3. Borrow Book" << endl;
cout << "4. Print All Books " << endl;
cin >> operation;
switch (operation) {
case 1:
cout << "Enter the name of the book " << endl;
string bookName;
getline(cin, bookName);
book::Book& newBook = getBook(bookName);
libraryManager.addBook(newBook);
break;
/*case 2:
break;
case 3:
break;
case 4:
break;
default:
break;*/
}
}
}
#包括
#包括“LibraryManager.h”
#包括“Book.h”
使用名称空间std;
使用名称空间库管理器;
使用名称空间书;
int main(){
整数运算=-1;
图书馆经理图书馆经理;
while(true){
cout如果您声明了头文件
void addBook(const book::Book& book);
但在.cpp中,您称之为addBooks
:
LibraryManager::void addBooks(const Books& book) {
shelf.insert(book.getName(), book);
}
所以您没有实现addBook
。这就是为什么在调用addBook
(如果您声明了头文件)时,main中会出现链接器错误的原因
void addBook(const book::Book& book);
但在.cpp中,您称之为addBooks
:
LibraryManager::void addBooks(const Books& book) {
shelf.insert(book.getName(), book);
}
所以您没有实现addBook
。这就是为什么在调用addBook
(如果您声明了头文件)时,main中会出现链接器错误的原因
void addBook(const book::Book& book);
但在.cpp中,您称之为addBooks
:
LibraryManager::void addBooks(const Books& book) {
shelf.insert(book.getName(), book);
}
所以您没有实现addBook
。这就是为什么在调用addBook
(如果您声明了头文件)时,main中会出现链接器错误的原因
void addBook(const book::Book& book);
但在.cpp中,您称之为addBooks
:
LibraryManager::void addBooks(const Books& book) {
shelf.insert(book.getName(), book);
}
所以您没有实现addBook
。这就是为什么在调用addBook
时,在LibraryManager.cpp文件中没有定义void addBook(const book::book&book);
函数,在main中出现链接器错误的原因
在Book.h和Book.cpp中有不同的名称空间…因此您在.h文件中声明了另一本书,并在.cpp文件中定义了新的一本书…我想是因为您忘了在Book.cpp中添加#include“Book.h”
更新
我最终重写了你的代码…犯了很多错误。没有使用常量、加扰的代码。写东西时请编译更多:
书
#ifndef BOOK_H
#define BOOK_H
namespace book {
class Book{
public:
void getBookName();
void setBorrowed(bool borrowed, std::string borrower);
bool isBorrowed();
std::string getBorrower();
};
}
#endif
#ifndef BOOK_H
#define BOOK_H
namespace book {
class Book {
public:
Book(std::string bookName);
std::string getBookName() const;
void setBorrowed(bool borrowed, std::string borrower);
bool isBorrowed();
std::string getBorrower();
private:
std::string bookName;
bool borrowed;
std::string borrower;
};
}
#endif
Book.cpp
#include <iostream>
using namespace librarymanager;
LibraryManager::class Book {
private:
string bookName;
bool borrowed;
string borrower;
public:
Book(string bookName) {
this->bookName = bookName;
}
string getBookName() {
return bookName;
}
void setBorrowed(bool borrowed, string borrower) {
if (borrowed == true) {
this->borrowed = borrowed;
this->borrower = borrower;
}
}
bool isBorrowed() {
return borrowed;
}
string getBorrower() {
return borrower;
}
};
#include <iostream>
#include "Book.h"
using namespace book;
Book::Book(std::string bookName) {
this->bookName = bookName;
}
std::string Book::getBookName() const {
return bookName;
}
void Book::setBorrowed(bool borrowed, std::string borrower) {
if (borrowed == true) {
this->borrowed = borrowed;
this->borrower = borrower;
}
}
bool Book::isBorrowed() {
return borrowed;
}
std::string Book::getBorrower() {
return borrower;
}
#包括
#包括“Book.h”
使用名称空间书;
Book::Book(std::string bookName){
此->书名=书名;
}
std::string Book::getBookName()常量{
返回书名;
}
作废帐簿::setBorrowed(bool借阅,std::字符串借阅){
如果(借用==真){
本->借用=借用;
该->借款人=借款人;
}
}
bool Book::islowed(){
归还借款;
}
std::string Book::get借款人(){
归还借款人;
}
图书馆经理
#ifndef LIBRARYMANAGER_H
#define LIBRARYMANAGER_H
#include <string>
#include "Book.h"
namespace librarymanager {
class LibraryManager {
public:
void addBook(const book::Book& book);
void removeBook(std::string bookName);
void markBarrowed(std::string bookName, std::string borrower);
void printAllBooks();
void printAllBorrowedBooks();
void printAllBorrowerDetails();
};
book::Book& getBook(std::string bookName);
}
#endif
#ifndef LIBRARYMANAGER_H
#define LIBRARYMANAGER_H
#include <string>
#include <map>
#include "Book.h"
namespace librarymanager {
class LibraryManager {
public:
void addBook(const book::Book& book);
void removeBook(std::string bookName);
void markBarrowed(std::string bookName, std::string borrower);
void printAllBooks();
void printAllBorrowedBooks();
void printAllBorrowerDetails();
private:
typedef std::map<std::string, book::Book> Books;
Books shelf;
};
book::Book getBook(std::string bookName);
}
#endif
\ifndef图书馆经理
#定义图书馆经理
#包括
#包括
#包括“Book.h”
命名空间库管理器{
班级图书馆经理{
公众:
无效addBook(const book::book&book);
void removeBook(std::string bookName);
作废标记(std::string bookName,std::string借用者);
作废printAllBooks();
作废打印所有借阅图书();
void printallowerdetails();
私人:
typedef std::地图册;
书架;
};
book::book getBook(std::string bookName);
}
#恩迪夫
LibraryManager.cpp
#include <iostream>
#include "LibraryManager.h"
#include "Book.h"
#include <map>
using namespace std;
map<string, Books&> shelf;
LibraryManager::void addBooks(const Books& book) {
shelf.insert(book.getName(), book);
}
LibraryManager::void removeBook(string bookName) {
shelf.erase(bookName);
}
LibraryManager::void printAll() {
for(map<string, Book&>::const_iterator iter = shelf.begin(), endIter = shelf.end(); iter != endIter(); iter++) {
cout << iter->first << endl;
}
}
namespace librarymanager {
book::Book& getBook(string name) {
Book book(name);
return book;
}
}
#include <iostream>
#include "LibraryManager.h"
#include "Book.h"
using namespace librarymanager;
using namespace book;
using namespace std;
void LibraryManager::addBook(const Book& book) {
shelf.insert(std::pair<std::string, book::Book>(book.getBookName(), book));
}
void LibraryManager::removeBook(string bookName) {
shelf.erase(bookName);
}
void LibraryManager::printAllBooks() {
for(map<string, Book>::const_iterator iter = shelf.begin(); iter != shelf.end(); iter++) {
cout << iter->first << endl;
}
}
namespace librarymanager {
book::Book getBook(string name) {
Book book(name);
return book;
}
}
#包括
#包括“LibraryManager.h”
#包括“Book.h”
使用名称空间库管理器;
使用名称空间书;
使用名称空间std;
void LibraryManager::addBook(const Book和Book){
insert(std::pair(book.getBookName(),book));
}
作废LibraryManager::removeBook(字符串bookName){
书架。擦除(书名);
}
void LibraryManager::printAllBooks(){
for(map::const_iterator iter=shelf.begin();iter!=shelf.end();iter++){
不能先在LibraryManager.cpp文件中定义void addBook(const book::book&book);
函数
在Book.h和Book.cpp中有不同的名称空间…因此您在.h文件中声明了另一本书,并在.cpp文件中定义了新的一本书…我想是因为您忘了在Book.cpp中添加#include“Book.h”
更新
我最终重写了你的代码…犯了很多错误。没有使用常量、加扰的代码。写东西时请编译更多:
书
#ifndef BOOK_H
#define BOOK_H
namespace book {
class Book{
public:
void getBookName();
void setBorrowed(bool borrowed, std::string borrower);
bool isBorrowed();
std::string getBorrower();
};
}
#endif
#ifndef BOOK_H
#define BOOK_H
namespace book {
class Book {
public:
Book(std::string bookName);
std::string getBookName() const;
void setBorrowed(bool borrowed, std::string borrower);
bool isBorrowed();
std::string getBorrower();
private:
std::string bookName;
bool borrowed;
std::string borrower;
};
}
#endif
Book.cpp
#include <iostream>
using namespace librarymanager;
LibraryManager::class Book {
private:
string bookName;
bool borrowed;
string borrower;
public:
Book(string bookName) {
this->bookName = bookName;
}
string getBookName() {
return bookName;
}
void setBorrowed(bool borrowed, string borrower) {
if (borrowed == true) {
this->borrowed = borrowed;
this->borrower = borrower;
}
}
bool isBorrowed() {
return borrowed;
}
string getBorrower() {
return borrower;
}
};
#include <iostream>
#include "Book.h"
using namespace book;
Book::Book(std::string bookName) {
this->bookName = bookName;
}
std::string Book::getBookName() const {
return bookName;
}
void Book::setBorrowed(bool borrowed, std::string borrower) {
if (borrowed == true) {
this->borrowed = borrowed;
this->borrower = borrower;
}
}
bool Book::isBorrowed() {
return borrowed;
}
std::string Book::getBorrower() {
return borrower;
}
#包括
#包括“Book.h”
使用名称空间书;
Book::Book(std::string bookName){
此->书名=书名;
}
std::string Book::getBookName()常量{
返回书名;
}
作废帐簿::setBorrowed(bool借阅,std::字符串借阅){
如果(借用==真){
本->借用=借用;
该->借款人=借款人;
}
}
bool Book::islowed(){
归还借款;
}
std::string Book::get借款人(){
归还借款人;
}
图书馆经理
#ifndef LIBRARYMANAGER_H
#define LIBRARYMANAGER_H
#include <string>
#include "Book.h"
namespace librarymanager {
class LibraryManager {
public:
void addBook(const book::Book& book);
void removeBook(std::string bookName);
void markBarrowed(std::string bookName, std::string borrower);
void printAllBooks();
void printAllBorrowedBooks();
void printAllBorrowerDetails();
};
book::Book& getBook(std::string bookName);
}
#endif
#ifndef LIBRARYMANAGER_H
#define LIBRARYMANAGER_H
#include <string>
#include <map>
#include "Book.h"
namespace librarymanager {
class LibraryManager {
public:
void addBook(const book::Book& book);
void removeBook(std::string bookName);
void markBarrowed(std::string bookName, std::string borrower);
void printAllBooks();
void printAllBorrowedBooks();
void printAllBorrowerDetails();
private:
typedef std::map<std::string, book::Book> Books;
Books shelf;
};
book::Book getBook(std::string bookName);
}
#endif
\ifndef图书馆经理
#定义图书馆经理
#包括
#包括
#包括“Book.h”
命名空间库管理器{
班级图书馆经理{
公众:
无效addBook(const book::book&book);
void removeBook(std::string bookName);
作废标记(std::string bookName,std::string借用者);
作废printAllBooks();
作废打印所有借阅图书();
void printallowerdetails();
私人:
typedef std::地图册;
书架;
};
book::book getBook(std::string bookName);
}
#e