Multiple Redefinition Error In C
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Redefinition Of Struct Error In C
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Typedef Redefinition
Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Redefinition errors in .h files up vote 6 down vote error redefinition of class c++ favorite //list.h file typedef struct _lnode{ struct _lnode *next; size_t row; size_t column; short data; }lnode; typedef struct _llist{ struct _lnode *head; size_t size; }llist; //matrix.h file typedef struct _matrix{ size_t width; size_t height; size_t k; int **data; }matrix; //smatrix.h file #include "list.h" #include "matrix.h" typedef struct _smatrix{ size_t width; size_t height; size_t k; llist data; }smatrix; smatrix* make_smatrix(matrix *m); smatrix.h file includes list.h file and matrix.h files. If struct type redefinition visual c++ I include those header files in smatrix.h file then I get redefinition of 'lnode'. redefinition of '_llist' and redefinition of '_matrix' errors. If I took those heder files our from smatrix.h file then the error went away but it complains about matrix type in the function parameter. I want to call functions defined in list.h and matrix.h files in smatrix.c file.. What do I do? Thanks in advance.. c share|improve this question edited Apr 29 '15 at 17:48 BartoszKP 22.4k84167 asked Mar 25 '11 at 8:18 LCYSoft 3,3041160116 add a comment| 4 Answers 4 active oldest votes up vote 12 down vote accepted Possible problem of multiple inclusions. Try to guard your header files with file list.h #ifndef _LISTH_ #define _LISTH_
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C Include Guard
Stack Overflow the company Business Learn more about hiring developers or posting ads with #pragma once us Stack Overflow Questions Jobs Documentation Tags Users Badges 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: Sign up Redefinition error with multiple derived classes in the main up vote 0 down vote http://stackoverflow.com/questions/5430019/redefinition-errors-in-h-files favorite I have an Object base class, and I have several derived classes called Item, Person, and Location. Because each of these are derived from Object I need to include Object.h in each of their header files, and I include all of the derived classes in my main. Because I am doing that I am getting a redefinition error. What I want to know is what is the correct way http://stackoverflow.com/questions/9457123/redefinition-error-with-multiple-derived-classes-in-the-main to include these files to avoid this error? Thanks! EDIT: object.h using namespace std; class Object{ string name; string description; public: Object(); Object(string name, string description); void set_name(string name); void set_description(string description); string get_name(); string get_description(); ~Object(); }; item.h using namespace std; #include "object.h" class Item : public Object{ public: Item(); Item(string name, string description); }; locale.h using namespace std; #include "object.h" class Locale : public Object{ public: Locale(); Locale(string name, string description); }; main.cpp #include
Programming Boards C++ Programming Redefinition error with repititions of header file declaration Getting started with C or C++ | C Tutorial | C++ Tutorial | C and C++ FAQ | Get http://cboard.cprogramming.com/cplusplus-programming/128929-redefinition-error-repititions-header-file-declaration.html a compiler | Fixes for common problems Thread: Redefinition error with repititions of header file declaration Thread Tools Show Printable Version Email this Page… Subscribe to this Thread… Display Linear Mode Switch to Hybrid Mode Switch https://www.quora.com/Why-typedef-redefinition-is-allowed-in-C++-but-not-in-C to Threaded Mode 08-01-2010 #1 shrink_tubing View Profile View Forum Posts Registered User Join Date Jan 2010 Posts 87 Redefinition error with repititions of header file declaration Hi, I'm not sure if this is a compiler error in problem. I have the following in one file: Code: #include
ProgrammingWhy typedef redefinition is allowed in C++ but not in C?Consider following C program:#include