Qt Redefinition Of Class Error
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C++ Error Redefinition Of Function
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Error Redefinition Of C
just like you, helping each other. Join them; it only takes a minute: Sign up Why am I getting this redefinition of class error? up vote 6 down vote favorite 1 Apologies for the code dump: gameObject.cpp: #include "gameObject.h" class gameObject { private: int x; int y; public: gameObject() { x = 0; y = 0; redefinition of class c++ xcode } gameObject(int inx, int iny) { x = inx; y = iny; } ~gameObject() { // } int add() { return x+y; } }; gameObject.h: class gameObject { private: int x; int y; public: gameObject(); gameObject(int inx, int iny); ~gameObject(); int add(); }; Errors: ||=== terrac, Debug ===| C:\terrac\gameObject.cpp|4|error: redefinition of `class gameObject'| C:\terrac\gameObject.h|3|error: previous definition of `class gameObject'| ||=== Build finished: 2 errors, 0 warnings ===| I can't figure out what's wrong. Help? c++ class redefinition share|improve this question edited Mar 14 '14 at 8:09 sellibitze 18.1k24076 asked Sep 19 '10 at 16:26 Dataflashsabot 4362922 add a comment| 7 Answers 7 active oldest votes up vote 21 down vote accepted You're defining the class in the header file, include the header file into a *.cpp file and define the class a second time because the first definition is dragged into the translation unit by the header file. But only one gameObject class definition is allowed per translation unit. You actually don't need to def
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Redefinition Of Class C++ Inheritance
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site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers c++ redefinition of constructor or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a http://stackoverflow.com/questions/3746484/why-am-i-getting-this-redefinition-of-class-error community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Multiple redefinition error up vote 2 down vote favorite After learning more about classes and pointers, I refactored a program I had and wiped out > 200 lines of code, in the process creating http://stackoverflow.com/questions/4054357/multiple-redefinition-error two other classes, Location and Piece. The problem is, after getting everything to compile, the linker complains that the constructor for Piece is defined multiple times, with a load of errors: In function 'Piece': board.o multiple definition of 'Piece::Piece(int)` char_traits.h In function 'Piece': board.o multiple definition of 'Piece::Piece(int)` piece.cpp In function 'Piece': player.o multiple definition of 'Piece::Piece(int)` piece.cpp In function 'Piece': player.o multiple definition of 'Piece::Piece(int)` piece.cpp (yes, same exact error!) In function 'Piece': refereee.o multiple definition of 'Piece::Piece(int)` char_traits.h In function 'Piece': referee.o multiple definition of 'Piece::Piece(int)` piece.cpp ... When I click on the error for char_traits.h, it brings me to this: static size_t length(const char_type* __s) //error points here to line 262 { return __builtin_strlen(__s); } Another char_traits.h brings me to static int compare(const char_type* __s1, const char_type* __s2, size_t __n) //line 258, error points here too { return __builtin_memcmp(__s1, __s2, __n); } And just so you know, location.h is the only thing that includes pi
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#include "Object.cpp" class Integer : public Object { }; Boolean.cpp 1
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#include "Object.cpp" class Boolean : public Object { }; http://www.cplusplus.com/forum/beginner/4915/ Main.cpp 1
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#include "Integer.cpp" #include "Object.cpp" int main() { Integer i; Boolean b; return 0; } When i compile the project i get error as error C2011: 'Object' : 'class' http://www.cyberforum.ru/qt/thread304008.html type redefinition Now, in Main.cpp file i make use of both Integer and Boolean so isn't including this files valid? help appreciated amal Oct 17, 2008 at 8:42am UTC definition of guestgulkan (2942) Yes you will get C2011: 'Object' : 'class' type redefinition error. This is because main.cpp line 1 - includes interger.cpp which itself includes object.cpp. and on line 2 there is include object.cpp So object cpp gets included twice which means that class Object is seen twice by the compiler - hence the error. The way you redefinition of c are including cpp files is not the recommended way of doing things. Class declarations are usually put into header files. The code for the class is put into the cpp file. The header file should have a header guard to prevent multiple inclusion errors. Example of header guard object.h 1
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//header guard at start of header file #ifndef OBJECT_H #define OBJECT_H class Object { }; //End guard at bottom of header file #endif Do something similar for the other class declaration files; integer.h 1
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#ifndef INTEGER_H #define INTEGER_H #include "Object.h" class Integer : public Object { }; #endif boolean.h 1
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#ifndef BOOLEAN_H #define BOOLEAN_H #include "Object.h" class Boolean : public Object { }; #endif Then in main.cpp you will have: 1
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#include "Integer.h" #include "Object.h" //probably won't need this line #include boolean.h int main() { Integer i; Boolean b; return 0; } Oct 17, 2008 at 10:09am UTC amalshah71 (15) Thanks, guestgulkan ...that helped... Oct 17, 2008 at 10:20am UTC amalshah71 (15) Hello, I am facing a tye cast problem, bu
Восстановить пароль Регистрация Регистрация Тесты Блоги Сообщество Поиск Ссылки сообщества Социальные группы Поиск Google по форуму Поиск Yandex по форуму Поиск по форуму Расширенный поиск Тесты Список тестов К странице... @ignisdivine 4 / 4 / 0 Регистрация: 27.03.2011 Сообщений: 38 24.05.2011, 20:35 Redefinition of 'class MainWindow' #1 Здравствуйте. Необходимо использовать класс MainWindow в классе FtpView, однако подключение библиотке в ftpview.h (передать параметром в функции) создает ошибку Redefinition of 'class MainWindow'. В чем проблема? Спасибо. mainwindow.h C++1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 #include