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이의이 조각 코드를 보자복사 생성자와 연결 오류
MyClass mc1(5);
MyClass mc2(mc1);
이 기본 복사 생성자 호출 자동으로 mc2.m_num = mc1.m_num을 지정할 것입니까? 또한 인스턴스에게 다음과 같은 방법으로 만드는 클래스 내부 전화가 있다면 :
MyClass mc3(*this);
이것은 * 이것은 단지지고 개체 자체를 복사 할 MC2와 같은 기본 복사 생성자 호출을?
두 번째 문제 Microsoft Visual Studio 2013에서 코드를 컴파일하는 데 어려움이 있습니다. String 클래스를 만들었고 컴파일하려고 할 때 함수가 이미 정의되어 있다는 오류 메시지가 나타납니다. 몇몇 이유. String.h :
#pragma once
class String
{
private:
char* m_szStr;
unsigned int m_length;
public:
String(const char*);
explicit String(unsigned int);
String(const String&);
~String();
String& operator=(const String&);
bool operator==(const String&) const;
String operator+(const String&) const;
operator const char*() const;
int findStr(char*) const;
int getLen() const;
void copyStr(const char*);
}};
String.cpp :
#include "stdafx.h"
#include "String.h"
String::String(const char* pch)
{
m_szStr = NULL;
copyStr(pch);
}
String::String(unsigned int len)
{
m_length = len;
m_szStr = new char[m_length];
}
String::String(const String& that)
{
copyStr(that.m_szStr);
}
String::~String()
{
delete[] m_szStr;
}
String& String::operator=(const String& that)
{
copyStr(that.m_szStr);
return *this;
}
bool String::operator==(const String& that) const
{
if (m_length != that.m_length)
return false;
for (unsigned int i = 0; i < m_length; i++)
{
if (m_szStr[i] != that.m_szStr[i])
return false;
}
return true;
}
String String::operator+(const String& that) const
{
String temp(m_length + that.m_length - 1);
unsigned int offset = m_length;
for (unsigned int i = 0; i < that.m_length; i++)
{
temp.m_szStr[offset] = that.m_szStr[i];
}
return temp;
}
String::operator const char*() const
{
return m_szStr;
}
int String::findStr(char* pch) const
{
unsigned int offset = 0;
unsigned int strIndex = -1;
for (unsigned int i = 0; m_szStr[i] != NULL && pch[offset] != NULL; i++)
{
if (m_szStr[i] == pch[offset])
{
if (strIndex == -1)
strIndex = i;
offset++;
}
else
{
strIndex = -1;
offset = 0;
}
}
return strIndex;
}
int String::getLen() const
{
unsigned int len = 0;
for (unsigned int i = 0; m_szStr[i] != NULL; i++)
{
len++;
}
return len;
}
void String::copyStr(const char* pch)
{
if (!m_szStr)
delete[] m_szStr;
unsigned int pchLen = 0;
for (unsigned int i = 0; pch[i] != NULL; i++)
{
pchLen++;
}
m_length = pchLen;
m_szStr = new char[m_length];
for (unsigned int i = 0; i < m_length; i++)
{
m_szStr[i] = pch[i];
}
}
코드 파일 :
#include "stdafx.h"
#include <iostream>
#include "String.cpp"
using namespace std;
int _tmain(int argc, _TCHAR* argv[])s
{
String s1("Hi!");
String s2(5);
s2 = "Hello, Hi!";
const char* pch = static_cast<const char*>(s2);
cout << pch << endl;
return 0;
}
오류 : 기본 코드 파일에서
Error 1 error LNK2005: "public: __thiscall String::String(class String const &)" ([email protected]@[email protected]@@Z) already defined in assignment4.obj C:\Users\****\Desktop\C++ Programming\assignment4\assignment4\String.obj assignment4
Error 2 error LNK2005: "public: __thiscall String::String(unsigned int)" ([email protected]@[email protected]@Z) already defined in assignment4.obj C:\Users\****\Desktop\C++ Programming\assignment4\assignment4\String.obj assignment4
Error 3 error LNK2005: "public: __thiscall String::String(char const *)" ([email protected]@[email protected]@Z) already defined in assignment4.obj C:\Users\****\Desktop\C++ Programming\assignment4\assignment4\String.obj assignment4
Error 4 error LNK2005: "public: __thiscall String::~String(void)" ([email protected]@[email protected]) already defined in assignment4.obj C:\Users\****\Desktop\C++ Programming\assignment4\assignment4\String.obj assignment4
Error 5 error LNK2005: "public: class String & __thiscall String::operator=(class String const &)" ([email protected]@[email protected]@@Z) already defined in assignment4.obj C:\Users\****\Desktop\C++ Programming\assignment4\assignment4\String.obj assignment4
Error 6 error LNK2005: "public: bool __thiscall String::operator==(class String const &)const " ([email protected]@[email protected]@Z) already defined in assignment4.obj C:\Users\****\Desktop\C++ Programming\assignment4\assignment4\String.obj assignment4
Error 7 error LNK2005: "public: __thiscall String::operator char const *(void)const " ([email protected]@QBEPBDXZ) already defined in assignment4.obj C:\Users\****\Desktop\C++ Programming\assignment4\assignment4\String.obj assignment4
Error 8 error LNK2005: "public: class String __thiscall String::operator+(class String const &)const " ([email protected]@[email protected]@@Z) already defined in assignment4.obj C:\Users\****\Desktop\C++ Programming\assignment4\assignment4\String.obj assignment4
Error 9 error LNK2005: "public: void __thiscall String::copyStr(char const *)" ([email protected]@@[email protected]) already defined in assignment4.obj C:\Users\****\Desktop\C++ Programming\assignment4\assignment4\String.obj assignment4
Error 10 error LNK2005: "public: int __thiscall String::findStr(char *)const " ([email protected]@@[email protected]) already defined in assignment4.obj C:\Users\****\Desktop\C++ Programming\assignment4\assignment4\String.obj assignment4
Error 11 error LNK2005: "public: int __thiscall String::getLen(void)const " ([email protected]@@QBEHXZ) already defined in assignment4.obj C:\Users\****\Desktop\C++ Programming\assignment4\assignment4\String.obj assignment4
Error 12 error LNK1169: one or more multiply defined symbols found C:\Users\****\Desktop\C++ Programming\assignment4\Debug\assignment4.exe 1 1 assignment4
@ πάνταῥεῖ done을 답장하셨습니다. –
'String.cpp' 파일을 실행 파일에 연결 했습니까? –
가능한 복제본 : [정의되지 않은 참조/확인되지 않은 외부 기호 오류 란 무엇이며 어떻게 수정합니까?] (http://stackoverflow.com/questions/12573816/what-is-an-undefined-reference-unresolved-external -symbol-error-and-how-do-i-fix) –