多重定义错误 [英] Multiple definition error
问题描述
与上一篇文章类似的问题。我用
创建了一个项目，大约有7个文件，包括3个头文件和3个实现文件。我在编译一个特定的
类文件时遇到多重定义错误。我已经检查过，如果标识符的存储分配不止一个，那么就会出现此错误。但我不会看到问题出在哪里。有什么建议吗？
< code>
//ItemType.h
#ifndef ItemType_hpp //我被告知要包括这个指令
#define ItemType_hpp
#include< fstream>
#include< iostream>
#include" StrTypeAugmented.h"
const int MAX_ITEMS = 25;
enum RelationType {LESS，EQUAL，GREATER} ;
class HouseType
{
public：
void GetFromFile（std :: ifstream&）;
void WriteToFile（std :: ofstream&）;
void GetFromUser（）;
void PrintHouseToScreen（）;
void GetNameFromUser（）;
void PrintNameToScreen（）;
RelationType ComparisonTo（HouseType）;
private：
StrType lastName;
StrType firstName;
StrType地址;
浮动价格;
int squareFeet ;
int bedRooms;
};
#endif
// Ite mType.cpp
#include" ItemType.h"
typedef HouseType ItemType;
using namespace std ;
// ItemType.cpp是真实的
//庄园操作程序数据的实现文件。
void HouseType :: GetFromFile（性病:: ifstream的和放;文件）
{
lastName.GetStringFile（true，NOT_NEW，file）;
firstName.GetStringFile（true，NOT_NEW，file）;
address.GetStringFile（true，NOT_NEW，file）;
file> price> squareFeet> bedRooms;
}
void HouseType :: WriteToFile（std :: ofstream& file）
{
lastName.PrintToFile（false，file） ;
firstName.PrintToFile（true，file）;
address.PrintToFile（true，file）;
file<< endl<<价格<< endl;
file<< squareFeet<< endl;
file<< bedRooms<<结束;
}
void HouseType :: GetFromUser（）
{
cout<< 输入姓氏;按回车键。 << endl;
lastName.GetString（true，NOT_NEW）;
cout<< 输入名字;按回车键。 << endl;
firstName.GetString（true，NOT_NEW）;
cout<< 输入地址;按回车键。 << endl;
address.GetString（true，NOT_NEW）;
cout<< 输入价格，平方英尺，卧室数量;
<< "按回车键。 <<结束;
cin>价格> squareFeet> bedRooms;
}
void HouseType :: PrintHouseToScreen（）< br $>
{
firstName.PrintToScreen（false）;
cout<< " " ;;
lastName.PrintToScreen（false）;
address.PrintToScreen（true）;
cout<< endl<< 价格： <<价格<< endl;
cout<< 平方英尺： << squareFeet<< endl;
cout<< 卧室： << bedRooms<<结束;
}
void HouseType :: GetNameFromUser（）
{
cout<< 输入姓氏;按回车键。 << endl;
lastName.GetString（true，NOT_NEW）;
cout<< 输入名字;按回车键。 << endl;
firstName.GetString（true，NOT_NEW）;
}
void HouseType :: PrintNameToScreen（）
{
firstName.PrintToScreen（false）;
cout<< " " ;;
lastName.PrintToScreen（false）;
cout<<结束;
}
RelationType HouseType :: ComparisonTo（HouseType house）
{
if （lastName< house.lastName）
返回LESS;
else if（house.lastName< lastName）
return GREATER;
else if（firstName< house.firstName）
返回LESS;
else if（house.firstName< firstName）
返回GREATER;
否则返回EQUAL;
}
< / code>
错误：
多个定义
`HouseType :: GetFromFile（std :: basic_ifstream< char，
std :: char_traits< char& ;）''
首先在这里定义
多个定义
`HouseType :: WriteToFile（std :: basic_ofstream< char，
std :: char_traits< char&）''
等..
zf*****@mail.com 写道：
<剪辑>
错误：
多个定义
`HouseType :: GetFromFile（std :: basic_ifstream< char，
std :: char_traits< char&）''
首先在这里定义
多重定义
`HouseType :: WriteToFile（std :: basic_ofstream< char，
std :: char_traits< char&）''
等..
你必须在另一个源文件中定义函数。
-
Ian Collins。
< blockquote> Ian Collins写道：
zf ***** @ mail.com 写道：
< snip>
>>错误：
`HouseType :: GetFromFile（std :: basic_ifstream< char，
std :: char_traits< char&）''
首先在这里定义
`HouseType的多重定义： ：将writeToFile（STD :: basic_ofstream< char，
std :: char_traits< char&）''
等..
你必须在另一个来源中定义函数文件。
或者您是否链接了相同的源文件两次？
-
Ian Collins。
基本规则：成员函数应该在实现文件中，或者应该是
是静态/内联（如果在.h文件中）
zf*****@mail.com 写道：
与上一篇文章类似的问题。我用
创建了一个项目，大约有7个文件，包括3个头文件和3个实现文件。我在编译一个特定的
类文件时遇到多重定义错误。我已经检查过，如果标识符的存储分配不止一个，那么就会出现此错误。但我不会看到问题出在哪里。有什么建议吗？
< code>
//ItemType.h
#ifndef ItemType_hpp //我被告知要包括这个指令
#define ItemType_hpp
#include< fstream>
#include< iostream>
#include" StrTypeAugmented.h"
const int MAX_ITEMS = 25;
enum RelationType {LESS，EQUAL，GREATER} ;
class HouseType
{
public：
void GetFromFile（std :: ifstream&）;
void WriteToFile（std :: ofstream&）;
void GetFromUser（）;
void PrintHouseToScreen（）;
void GetNameFromUser（）;
void PrintNameToScreen（）;
RelationType ComparisonTo（HouseType）;
private：
StrType lastName;
StrType firstName;
StrType地址;
浮动价格;
int squareFeet;
int bedRooms;
};
#endif
// ItemType.cpp
#include" ItemType.h"
typedef HouseType ItemType;
using namespace std ;
// ItemType.cpp是真实的
//庄园操作程序数据的实现文件。
void HouseType :: GetFromFile（性病:: ifstream的和放;文件）
{
lastName.GetStringFile（true，NOT_NEW，file）;
firstName.GetStringFile（true，NOT_NEW，file）;
address.GetStringFile（true，NOT_NEW，file）;
file> price> squareFeet> bedRooms;
}
void HouseType :: WriteToFile（std :: ofstream& file）
{
lastName.PrintToFile（false，file） ;
firstName.PrintToFile（true，file）;
address.PrintToFile（true，file）;
file<< endl<<价格<< endl;
file<< squareFeet<< endl;
file<< bedRooms<<结束;
}
void HouseType :: GetFromUser（）
{
cout<< 输入姓氏;按回车键。 << endl;
lastName.GetString（true，NOT_NEW）;
cout<< 输入名字;按回车键。 << endl;
firstName.GetString（true，NOT_NEW）;
cout<< 输入地址;按回车键。 << endl;
address.GetString（true，NOT_NEW）;
cout<< 输入价格，平方英尺，卧室数量;
<< "按回车键。 <<结束;
cin>价格> squareFeet> bedRooms;
}
void HouseType :: PrintHouseToScreen（）< br $>
{
firstName.PrintToScreen（false）;
cout<< " " ;;
lastName.PrintToScreen（false）;
address.PrintToScreen（true）;
cout<< endl<< 价格： <<价格<< endl;
cout<< 平方英尺： << squareFeet<< endl;
cout<< 卧室： << bedRooms<<结束;
}
void HouseType :: GetNameFromUser（）
{
cout<< 输入姓氏;按回车键。 << endl;
lastName.GetString（true，NOT_NEW）;
cout<< 输入名字;按回车键。 << endl;
firstName.GetString（true，NOT_NEW）;
}
void HouseType :: PrintNameToScreen（）
{
firstName.PrintToScreen（false）;
cout<< " " ;;
lastName.PrintToScreen（false）;
cout<<结束;
}
RelationType HouseType :: ComparisonTo（HouseType house）
{
if （lastName< house.lastName）
返回LESS;
else if（house.lastName< lastName）
return GREATER;
else if（firstName< house.firstName）
返回LESS;
else if（house.firstName< firstName）
返回GREATER;
否则返回EQUAL;
}
< / code>
错误：
多个定义
`HouseType :: GetFromFile（std :: basic_ifstream< char，
std :: char_traits< char& ;）''
首先在这里定义
多个定义
`HouseType :: WriteToFile（std :: basic_ofstream< char，
std :: char_traits< char&）''
等..
Similar problem to the previous post. I have created a project with
about 7 files including 3 header files and 3 implementation files. I
am getting a multiple definition error when compiling for one specific
file of class. I have checked that if there is more than one
allocation of storage for identifiers, this error arises. But I don''t
see where the problem lies. Any suggestions?
<code>
//ItemType.h
#ifndef ItemType_hpp // I was told to include this directives
#define ItemType_hpp
#include <fstream>
#include <iostream>
#include "StrTypeAugmented.h"
const int MAX_ITEMS = 25;
enum RelationType {LESS, EQUAL, GREATER};
class HouseType
{
public:
void GetFromFile(std::ifstream&);
void WriteToFile(std::ofstream&);
void GetFromUser();
void PrintHouseToScreen();
void GetNameFromUser();
void PrintNameToScreen();
RelationType ComparedTo(HouseType);
private:
StrType lastName;
StrType firstName;
StrType address;
float price;
int squareFeet;
int bedRooms;
};
#endif
// ItemType.cpp
#include "ItemType.h"
typedef HouseType ItemType;
using namespace std;
// ItemType.cpp is the implementation file for data for the real
// estate manipulation program.
void HouseType::GetFromFile(std::ifstream& file)
{
lastName.GetStringFile(true, NOT_NEW, file);
firstName.GetStringFile(true, NOT_NEW, file);
address.GetStringFile(true, NOT_NEW, file);
file >price >squareFeet >bedRooms;
}
void HouseType::WriteToFile(std::ofstream& file)
{
lastName.PrintToFile( false, file);
firstName.PrintToFile(true, file);
address.PrintToFile(true, file);
file << endl << price << endl;
file << squareFeet << endl;
file << bedRooms << endl;
}
void HouseType::GetFromUser()
{
cout << "Enter last name; press return." << endl;
lastName.GetString(true, NOT_NEW);
cout << "Enter first name; press return." << endl;
firstName.GetString(true, NOT_NEW);
cout << "Enter address; press return." << endl;
address.GetString(true, NOT_NEW);
cout << "Enter price, square feet, number of bedrooms;"
<< " press return." << endl;
cin >price >squareFeet >bedRooms;
}
void HouseType::PrintHouseToScreen()
{
firstName.PrintToScreen( false);
cout << " ";
lastName.PrintToScreen( false);
address.PrintToScreen(true);
cout << endl << "Price: " << price << endl;
cout << "Square Feet: " << squareFeet << endl;
cout << "Bedrooms: " << bedRooms << endl;
}
void HouseType::GetNameFromUser()
{
cout << "Enter last name; press return." << endl;
lastName.GetString(true, NOT_NEW);
cout << "Enter first name; press return." << endl;
firstName.GetString(true, NOT_NEW);
}
void HouseType::PrintNameToScreen()
{
firstName.PrintToScreen( false);
cout << " ";
lastName.PrintToScreen( false);
cout << endl;
}
RelationType HouseType::ComparedTo(HouseType house)
{
if (lastName < house.lastName)
return LESS;
else if (house.lastName < lastName)
return GREATER;
else if (firstName < house.firstName)
return LESS;
else if (house.firstName < firstName)
return GREATER;
else return EQUAL;
}
</code>
ERROR:
multiple definition of
`HouseType::GetFromFile(std::basic_ifstream<char,
std::char_traits<char&)''
first defined here
multiple definition of
`HouseType::WriteToFile(std::basic_ofstream<char,
std::char_traits<char&)''
etc..
zf*****@mail.com wrote:
<snip>
ERROR:
multiple definition of
`HouseType::GetFromFile(std::basic_ifstream<char,
std::char_traits<char&)''
first defined here
multiple definition of
`HouseType::WriteToFile(std::basic_ofstream<char,
std::char_traits<char&)''
etc..
You must have the function defined in another source file.
--
Ian Collins.
Ian Collins wrote:zf*****@mail.com wrote:
<snip>
>>ERROR:
multiple definition of
`HouseType::GetFromFile(std::basic_ifstream<char ,
std::char_traits<char&)''
first defined here
multiple definition of
`HouseType::WriteToFile(std::basic_ofstream<char ,
std::char_traits<char&)''
etc..
You must have the function defined in another source file.
Or are you linking the same source file twice?
--
Ian Collins.
basic rule: member function should be in implementation file or should
be static/inline(if in .h file)
zf*****@mail.com wrote:Similar problem to the previous post. I have created a project with
about 7 files including 3 header files and 3 implementation files. I
am getting a multiple definition error when compiling for one specific
file of class. I have checked that if there is more than one
allocation of storage for identifiers, this error arises. But I don''t
see where the problem lies. Any suggestions?
<code>
//ItemType.h
#ifndef ItemType_hpp // I was told to include this directives
#define ItemType_hpp
#include <fstream>
#include <iostream>
#include "StrTypeAugmented.h"
const int MAX_ITEMS = 25;
enum RelationType {LESS, EQUAL, GREATER};
class HouseType
{
public:
void GetFromFile(std::ifstream&);
void WriteToFile(std::ofstream&);
void GetFromUser();
void PrintHouseToScreen();
void GetNameFromUser();
void PrintNameToScreen();
RelationType ComparedTo(HouseType);
private:
StrType lastName;
StrType firstName;
StrType address;
float price;
int squareFeet;
int bedRooms;
};
#endif
// ItemType.cpp
#include "ItemType.h"
typedef HouseType ItemType;
using namespace std;
// ItemType.cpp is the implementation file for data for the real
// estate manipulation program.
void HouseType::GetFromFile(std::ifstream& file)
{
lastName.GetStringFile(true, NOT_NEW, file);
firstName.GetStringFile(true, NOT_NEW, file);
address.GetStringFile(true, NOT_NEW, file);
file >price >squareFeet >bedRooms;
}
void HouseType::WriteToFile(std::ofstream& file)
{
lastName.PrintToFile( false, file);
firstName.PrintToFile(true, file);
address.PrintToFile(true, file);
file << endl << price << endl;
file << squareFeet << endl;
file << bedRooms << endl;
}
void HouseType::GetFromUser()
{
cout << "Enter last name; press return." << endl;
lastName.GetString(true, NOT_NEW);
cout << "Enter first name; press return." << endl;
firstName.GetString(true, NOT_NEW);
cout << "Enter address; press return." << endl;
address.GetString(true, NOT_NEW);
cout << "Enter price, square feet, number of bedrooms;"
<< " press return." << endl;
cin >price >squareFeet >bedRooms;
}
void HouseType::PrintHouseToScreen()
{
firstName.PrintToScreen( false);
cout << " ";
lastName.PrintToScreen( false);
address.PrintToScreen(true);
cout << endl << "Price: " << price << endl;
cout << "Square Feet: " << squareFeet << endl;
cout << "Bedrooms: " << bedRooms << endl;
}
void HouseType::GetNameFromUser()
{
cout << "Enter last name; press return." << endl;
lastName.GetString(true, NOT_NEW);
cout << "Enter first name; press return." << endl;
firstName.GetString(true, NOT_NEW);
}
void HouseType::PrintNameToScreen()
{
firstName.PrintToScreen( false);
cout << " ";
lastName.PrintToScreen( false);
cout << endl;
}
RelationType HouseType::ComparedTo(HouseType house)
{
if (lastName < house.lastName)
return LESS;
else if (house.lastName < lastName)
return GREATER;
else if (firstName < house.firstName)
return LESS;
else if (house.firstName < firstName)
return GREATER;
else return EQUAL;
}
</code>
ERROR:
multiple definition of
`HouseType::GetFromFile(std::basic_ifstream<char,
std::char_traits<char&)''
first defined here
multiple definition of
`HouseType::WriteToFile(std::basic_ofstream<char,
std::char_traits<char&)''
etc..
这篇关于多重定义错误的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
