Make Error Redefinition Of
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Error: Redefinition Of Function
Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges redefinition of class c++ xcode Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: redefinition of class c++ inheritance Sign up error: redefinition of class up vote 2 down vote favorite 2 Here's my code: // in main.cpp #include "iostream" #include "circle.cpp" #include "rectangle.cpp" #include "shape.cpp" using namespace std; int main() { Shape shapes[10]; for (int i = 0; i < 10; i++){ if (i % 2) shapes[i] = Circle(5); else shapes[i] = Rectangle(10, 10); cout << shapes[i].getArea(); } return 0; }
C++ Redefinition Of Variable
// in circle.cpp #include "shape.cpp" class Circle : public Shape { private: int radius; static const double PI = 3.14159265358979323846; public: Circle (int radius) : radius(radius) {} virtual int getArea() const { return PI * radius*radius; }; virtual int setRadius(int radius){ radius = radius; } }; // in rectangle.cpp #include "shape.cpp" class Rectangle : public Shape { private: int width; int height; public: Rectangle(int width, int height) : width(width), height(height){} virtual int getArea() const { return width * height; } virtual void setWidth(int width){ this->width = width; } virtual void setHeigth(int height){ this->height = height; } }; // in shape.cpp class Shape { public: virtual int getArea() const = 0; }; When compiling, I get this error: error: redefinition of 'class Shape' How can I fix this? c++ compiler-errors share|improve this question asked Oct 3 '14 at 12:59 Aviv Cohn 2,02831243 Check out "include guards" or #pragma once for compilers that support something like that. It looks like the header may be included several time. And the whole including cpp files... this is not normally how it is done. –Niall Oct 3 '14
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Redefinition Of Ios
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() http://stackoverflow.com/questions/26179408/error-redefinition-of-class { x = 0; y = 0; } 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? http://stackoverflow.com/questions/3746484/why-am-i-getting-this-redefinition-of-class-error c++ class redefinition share|improve this question edited Mar 14 '14 at 8:09 sellibitze 18k24076 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 define the class a second time just to implement the functions. Implement the functions like this: #include "gameObject.h" gameObject::gameObject(int inx, int iny) { x = inx; y = iny; } int gameObject::add() { return x+y; } etc share|improve this answer answered Sep 19 '10 at 16:29 sellibitze 18k24076 1 Ahhhh, thank you! –Dataflashsabot Sep 19 '10 at 16:34 add a comment| up vote 6 down vote the implementation in the cpp file should be in the form gameObject::gameObject() { x = 0; y = 0; } gameObject::gameObject(int inx, int iny) { x = inx; y = iny; } gameObject::~gameObject() { // } int gameObject::add() { return x+y; } not within a class gameObject { } definition block share|improve this answer answered Sep 19 '10 at 16:30 frag 35815 1 In addition to this fix, constructors should use ctor-initializer-list and not the body of the constructor to in
on with this one. Here is the list of errors I'm receiving: In file http://www.cplusplus.com/forum/general/54356/ included from /u/zon-d2/ugrad/jlev222/qv-mvc/nameview.h:2, from /u/zon-d2/ugrad/jlev222/qv-mvc/namefirstview.h:1, from /u/zon-d2/ugrad/jlev222/qv-mvc/main.cpp:3: /u/zon-d2/ugrad/jlev222/qv-mvc/namemodel.h:4: error: redefinition of ‘class NameModel’ /u/zon-d2/ugrad/jlev222/qv-mvc/namemodel.h:4: error: previous definition of ‘class NameModel’ In file included from /u/zon-d2/ugrad/jlev222/qv-mvc/nameview.h:2, from /u/zon-d2/ugrad/jlev222/qv-mvc/namelastview.h:1, from /u/zon-d2/ugrad/jlev222/qv-mvc/main.cpp:4: /u/zon-d2/ugrad/jlev222/qv-mvc/namemodel.h:4: error: redefinition of ‘class NameModel’ /u/zon-d2/ugrad/jlev222/qv-mvc/namemodel.h:4: error: previous definition of ‘class NameModel’ In file included from /u/zon-d2/ugrad/jlev222/qv-mvc/namelastview.h:1, from /u/zon-d2/ugrad/jlev222/qv-mvc/main.cpp:4: /u/zon-d2/ugrad/jlev222/qv-mvc/nameview.h:4: error: redefinition of ‘class definition of View’ /u/zon-d2/ugrad/jlev222/qv-mvc/nameview.h:4: error: previous definition of ‘class View’ /u/zon-d2/ugrad/jlev222/qv-mvc/main.cpp: In function ‘int main(int, char**)’: /u/zon-d2/ugrad/jlev222/qv-mvc/main.cpp:10: error: variable ‘QTimer timer’ has initializer but incomplete type make[2]: *** [CMakeFiles/qt_mvc.dir/main.o] Error 1 make[1]: *** [CMakeFiles/qt_mvc.dir/all] Error 2 make: *** [all] Error 2 I know this is a lot, but I'm only paying attention to the top, I'm definition of class hoping this is an include error, but I'm not sure. Also, I can provide the source code and headers if needed, but I warn ahead of time... they aren't huge files, but 11 in total including main.cpp. Also, it may be important to note I'm using CMake to build this, but CMake doesn't seem to have issues. Any ideas? Nov 6, 2011 at 11:32pm UTC andywestken (4007) Given the prev definitions are in the same file, it looks like you're including the same headers multiple times. So you need to add guard code 1
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#ifndef Included_NameModel_H #define Included_NameModel_H // Existing code goes here #endif // Included_NameModel_H Using whatever naming convention you like. Or, if you compiler supports it, add #pragma once at the start of the header Nov 7, 2011 at 12:17am UTC aerowenn (44) @andywestken Thanks, I'll give this a shot and let you know how it works out. Nov 7, 2011 at 12:45am UTC aerowenn (44) @andywest