我正在处理一个项目并且不断收到链接器错误，即使到目前为止基本上没有可执行代码。错误消息在下面，从我收集的内容，它与重载的赋值运算符有关，我还没有定义它。
我可以通过私信进一步阐述，或者如果您想查看代码。这是由于我学校的学术诚信政策，我不希望被开除！
提前致谢！
调用：MacOS X C ++链接器
g ++ -o＆＃34; ProjectName＆＃34; ./Class.o ./ProjectName.o
架构x86_64的未定义符号：
＆＃34; Class :: operator =（Class const＆amp;）＆＃34;，引自：
Class::Class(Class const&) in Class.o
ld：找不到架构x86_64的符号
clang：错误：链接器命令失败，退出代码为1（使用-v查看调用）
make：*** [ProjectName]错误1
**更新**
如果你看到＆＃34; Class＆＃34;作为一个类名任何地方意味着我忘了将它改回真正的类名，即ShirtOrder。
以下是我的主cpp文件中的代码：
#include <iostream>
#include <fstream>
#include <iomanip>
#include <string>
#include <cmath>
#include "ShirtOrder.h"
using namespace std;
/*********************************************************************************************************************
***************** FUNCTION PROTOTYPES -- FUNCTION PROTOTYPES -- FUNCTION PROTOTYPES -- FUNCTION PROTOTYPES **********
*********************************************************************************************************************/
bool uploadFile(string fName, unsigned long &count, ShirtOrder* &head);
void clearLL(unsigned long &count, ShirtOrder* &head);
void summaryByMethod(unsigned long count, ShirtOrder* head);
void summaryByRegion(unsigned long count, ShirtOrder* head);
/*********************************************************************************************************************
***************** MAIN FUNCTION -- MAIN FUNCTION -- MAIN FUNCTION -- MAIN FUNCTION -- MAIN FUNCTION *****************
*********************************************************************************************************************/
int main(int argc, char* argv[])
{
if (argc < 2) // if only command line argument is program name
{
cout << "No file name entered." << endl;
}
else
{
ShirtOrder object;
cout << "Test run" << endl;
}
return 0;
}
/**********************************************************************************************************
************ FUNCTION IMPLEMENTATIONS -- FUNCTION IMPLEMENTATIONS -- FUNCTION IMPLEMENTATIONS ************
**********************************************************************************************************/
bool uploadFile(string fName, unsigned long &count, ShirtOrder* &head)
{
return true;
}
void clearLL(unsigned long &count, ShirtOrder* &head)
{
}
void summaryByMethod(unsigned long count, ShirtOrder* head)
{
}
void summaryByRegion(unsigned long count, ShirtOrder* head)
{
}
我的ShirtOrder.h文件：
#ifndef SHIRTORDER_H_
#define SHIRTORDER_H_
#include <iostream>
#include <fstream>
#include <string>
#include <cmath>
#include <iomanip>
using namespace std;
class ShirtOrder
{
friend ostream& operator<<(ostream &os, const ShirtOrder &rhsObj);
private:
// the data members below are required (you may change identifiers)
// there is no need for additional data members
int orderYear, orderMonth, orderDay;
char printMethod; // 's', 'i', or 'e'
string message;
int mediums; // number of medium shirts ordered
int larges; // number of large shirts ordered
int xls; // number of XL shirts ordered
string shirtColor;
string inkColor;
string orderID;
string region;
string nameAndEmail;
ShirtOrder* next; // new for P5
public:
ShirtOrder(); // default constructor
ShirtOrder(int orderYear, int orderMonth, int orderDay,
char printMethod, string message, int mediums, int larges, int xls,
string shirtColor, string inkColor, string orderID,
string region, string nameAndEmail,
ShirtOrder *soPtr = NULL);
ShirtOrder(const ShirtOrder &otherObj);
~ShirtOrder(); // destructor // New for P5 (may not be in-line)
ShirtOrder* getNext() const {return next;} // New for P5 (may be in-line)
void setNext(ShirtOrder* soPtr) {next = soPtr;} // New for P5 (may be in-line)
ShirtOrder operator=(const ShirtOrder &rhsObj); // New for P5 (may not be in-line)
double getBlankCost() const;
double getPrintingCost() const;
double getTotalCost() const;
int getLetterCount() const;
char getPrintMethod() const {return printMethod;}
int getOrderYear() const {return orderYear;}
int getOrderMonth() const {return orderMonth;}
int getOrderDay() const {return orderDay;}
int getMediums() const {return mediums;}
int getLarges() const {return larges;}
int getXls() const{return xls;}
string getShirtColor() const {return shirtColor;}
string getInkColor() const {return inkColor;}
string getOrderID() const {return orderID;}
string getRegion() const {return region;}
string getNameAndEmail() const {return nameAndEmail;}
string getMessage() const {return message;}
void setOrderYear (int orderYear) {this->orderYear = orderYear;}
void setOrderMonth (int orderMonth) {this->orderMonth = orderMonth;}
void setOrderDay (int orderDay) {this->orderDay = orderDay;}
void setPrintMethod (char printMethod) {this->printMethod = printMethod;}
void setMessage (string message) {this->message = message; }
void setMediums (int mediums) {this->mediums = mediums;}
void setLarges (int larges) {this->larges = larges;}
void setXls (int xls) {this->xls = xls;}
void setShirtColor (string shirtColor) {this->shirtColor = shirtColor;}
void setInkColor (string inkColor) {this->inkColor = inkColor;}
void setOrderID (string orderID) {this->orderID = orderID;}
void setRegion (string region) {this->region = region;}
void setNameAndEmail (string nameAndEmail) {this->nameAndEmail = nameAndEmail;}
}; // end declaration of class ShirtOrder
/******************************************************************************************
*********** MEMBER FUNCTION IMPLEMENTATIONS -- MEMBER FUNCTION IMPLEMENTATIONS ***********
******************************************************************************************/
#endif /* SHIRTORDER_H_ */
我的ShirtOrder.cpp文件：
#include "ShirtOrder.h"
#include <iostream>
#include <string>
#include <fstream>
#include <vector>
using namespace std;
/******************************************************************************************
*********** MEMBER FUNCTION IMPLEMENTATIONS -- MEMBER FUNCTION IMPLEMENTATIONS ***********
******************************************************************************************/
// Default Constructor
ShirtOrder::ShirtOrder()
{
orderYear = 0;
orderMonth = 0;
orderDay = 0;
printMethod = 'x'; // 's', 'i', or 'e'
message = "";
mediums = 0; // number of medium shirts ordered
larges = 0; // number of large shirts ordered
xls = 0; // number of XL shirts ordered
shirtColor = "";
inkColor = "";
orderID = "";
region = "";
nameAndEmail = "";
next = NULL;
cout << "Default constructor has run" << endl;
}
// Other Constructor
ShirtOrder::ShirtOrder(int orderYear, int orderMonth, int orderDay,
char printMethod, string message, int mediums, int larges, int xls,
string shirtColor, string inkColor, string orderID,
string region, string nameAndEmail, ShirtOrder *soPtr)
{
this-> orderYear = orderYear;
this->orderMonth = orderMonth;
this->orderDay = orderDay;
this->printMethod = printMethod; // 's', 'i', or 'e'
this->message = message;
this->mediums = mediums; // number of medium shirts ordered
this->larges = larges; // number of large shirts ordered
this->xls = xls; // number of XL shirts ordered
this->shirtColor = shirtColor;
this->inkColor = inkColor;
this->orderID = orderID;
this->region = region;
this->nameAndEmail = nameAndEmail;
next = NULL;
cout << "Constructor Numero Dos has run" << endl;
}
// Other, other constructor
ShirtOrder::ShirtOrder(const ShirtOrder &otherObj)
{
ShirtOrder object;
object = otherObj;
object.orderYear = otherObj.orderYear;
object.orderMonth = otherObj.orderMonth;
object.orderDay = otherObj.orderDay;
object.printMethod = otherObj.printMethod;
object.message = otherObj.message;
object.mediums = otherObj.mediums;
object.larges = otherObj.larges;
object.xls = otherObj.xls;
object.shirtColor = otherObj.shirtColor;
object.inkColor = otherObj.inkColor;
object.orderID = otherObj.orderID;
object.region = otherObj.region;
object.nameAndEmail = otherObj.nameAndEmail;
object.next = otherObj.next;
cout << "Constructor Numero Tres has run" << endl;
}
// DESTRUCTOR
ShirtOrder::~ShirtOrder()
{
cout << "Destructor has run" << endl;
}
ShirtOrder operator=(const ShirtOrder &rhsObj)
{
}
// COME BACK TO REMOVE WHITESPACE
int ShirtOrder::getLetterCount() const
{
string tempMessage = getMessage();
int pos1 = tempMessage.find("\"") + 1; // find first occurrence of a double quotation mark and assign position +1 value to pos1
int pos2 = tempMessage.rfind("\"") - 1; // find last occurrence of a double quotation mark and assign position -1 value to pos2
tempMessage = tempMessage.substr(pos1, (pos2 - pos1)); // sets variable tempMessage to string between quotation marks
return tempMessage.length();
}
double ShirtOrder::getBlankCost() const
{
return 0.0;
}
double ShirtOrder::getPrintingCost() const
{
return 0.0;
}
double ShirtOrder::getTotalCost() const
{
return 0.0;
}
答案 0 :(得分：2)
链接器告诉您Class.cpp中缺少Connected to:
Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production
With the Partitioning, OLAP, Advanced Analytics and Real Application Testing options
SQL> select t.* from xmltable(XMLNAMESPACES('http://test/asdf/bean' as "bean")
2 ,'//bean:TransactionData/TransactionRequest/CustomerId'
3 passing xmltype('<ns:TransactionData xmlns:ns="http://test/asdf/bean" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="ns:TransactionData">
4 <TransactionRequest xmlns:nste="http://pegasus/component/payment/bean" xsi:type="nste:bankTransferRequest">
5 <CustomerId>0001</CustomerId>
6 <Account>12332131321331</Account>
7 <Currency>MMK</Currency>
8 <Reference>83550 test</Reference>
9 </TransactionRequest>
10 </ns:TransactionData>')) as t;
COLUMN_VALUE
--------------------------------------------------------------------------------
<CustomerId>0001</CustomerId>
您需要从Class.h中删除其声明，或在Class.cpp中添加实现。
您最初报告的错误不会与代码匹配。无论如何，这些都是你遇到的问题：
Class::Class(Class const&)（应为ShirtOrder operator=(const ShirtOrder &rhsObj)）ShirtOrder&; *this，而必须是.cpp文件中的ShirtOrder& ShirtOrder::operator=(const ShirtOrder &rhsObj) ShirtOrder& ShirtOrder::operator=(const ShirtOrder &rhsObj)没有正确实现。它必须将所有这些值分配到ShirtOrder::ShirtOrder(const ShirtOrder &otherObj)而不是this->