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Error Redefinition Of Class C++

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Error Redefinition Of Typedef 'gliststore'

is a community of 4.7 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 favorite //list.h file error redefinition of ‘class 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 I include those header error redefinition of ‘struct 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 3,2941160116 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_ #endif file matrix.h #ifndef _MATRIXH_ #define _MATRIXH_ #endif It will prevent you too have redefinitions if you have a loop in header inclusions. share|improve this answer edited Mar 25 '11 at 8:29 answered Mar 25 '11 at 8:21 M'vy 3,98011532 list.h like this? –LCYSoft Mar 25 '11 at 8:27 @LCYSoft Edited –M'vy Mar 25 '11 at 8:29 Thanks a loooot! –LCYSoft Mar 25 '11 at 8:42 You welcome @LCYSoft –M'vy Mar 25 '11 at 8:46 add a comme

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Error Redefinition Of 'struct Iovec'

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Error Redefinition Of Typedef 'glistmodel'

Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up GCC compiler error: “redefinition…previously defined” up vote 7 down http://stackoverflow.com/questions/5430019/redefinition-errors-in-h-files vote favorite 3 I'm getting a lot of " redefinition of x....x previously defined here". Please what does this error means? c++ gcc compiler-construction share|improve this question asked Apr 2 '09 at 1:00 caesar add a comment| 3 Answers 3 active oldest votes up vote 20 down vote You need to limit each file from being included only once. You can do this in 2 ways. 1) At http://stackoverflow.com/questions/707920/gcc-compiler-error-redefinition-previously-defined the top of your header files put: #pragma once Or 2) if your compiler doesn't support that, put at the top/end of your header files: #ifndef _MYFILE_H_ #define _MYFILE_H_ ... #endif Replace MYFILE with the name of your file, and replace ... with the contents of the header file. share|improve this answer edited Apr 2 '09 at 7:11 unwind 254k38331460 answered Apr 2 '09 at 1:18 Brian R. Bondy 198k82474572 1 I think that #pragma only works in VC++, not in gcc. The #define trick is portable. –Gorpik Apr 2 '09 at 7:19 supoprted by gcc and vc++ –Brian R. Bondy Apr 2 '09 at 10:29 Wikipedia says #pragma once is supported by VC++ and gcc en.wikipedia.org/wiki/Pragma_once . –Max Lybbert Apr 3 '09 at 20:48 #pragma works fine with gcc.. I'm using it at this very moment after I reading about it and it solved a ton of errors! –mmoment Sep 7 '12 at 14:13 add a comment| up vote 9 down vote The error means that there is a symbol that has been defined in one place and an alternate definition has been made in another place. This can occur if in cases like

Programming Boards C Programming function redefinition error Getting started with C or C++ | C Tutorial | C++ Tutorial | C and C++ FAQ | Get a compiler | Fixes for http://cboard.cprogramming.com/c-programming/122160-function-redefinition-error.html common problems Thread: function redefinition error Thread Tools Show Printable Version Email this Page… Subscribe to this Thread… Display Linear Mode Switch to Hybrid Mode Switch to Threaded Mode 12-01-2009 #1 pepelepew View Profile View https://www.quora.com/Why-typedef-redefinition-is-allowed-in-C++-but-not-in-C Forum Posts Registered User Join Date Nov 2009 Posts 4 function redefinition error hey guys, total newbie question here, but on this program I am writing I am, all of the sudden, getting an error saying error redefinition "redefinition of 'show_all_passengers' ", and I'm not sure why this is happening. Any help is really appreciated, thanks, John 12-01-2009 #2 hk_mp5kpdw View Profile View Forum Posts Registered User Join Date Jan 2002 Location Northern Virginia/Washington DC Metropolitan Area Posts 3,817 You probably have an object (show_all_passengers) in a header somewhere that's getting included multiple times which to the compilers point of view is attempting to have several different objects with the error redefinition of same name created (this is bad). If this is the case, remove the objects declaration from the header (or at least make it "extern" within the header) and make sure an actual declaration exists only in a single source file. ... or something along those lines. "Owners of dogs will have noticed that, if you provide them with food and water and shelter and affection, they will think you are god. Whereas owners of cats are compelled to realize that, if you provide them with food and water and shelter and affection, they draw the conclusion that they are gods." -Christopher Hitchens 12-01-2009 #3 Epy View Profile View Forum Posts Visit Homepage Fortran lover Join Date Sep 2009 Location California, USA Posts 1,298 If indeed the compiler is reincluding a header more than once, you should look up "include guards": Include guard - Wikipedia, the free encyclopedia Code: /* contents of myheader.h */ #ifndef MYHEADER_H #define MYHEADER_H /* code here */ #endif Some compilers support the following: Code: /* first line of your header file */ #pragma once which tells the compiler to only use that header once. Quick Navigation C Programming Top Site Areas Settings Private Messages Subscriptions Who's Online Search Forums Forums Home Forums General Programming Boards C++ Programming C Progr

ProgrammingWhy typedef redefinition is allowed in C++ but not in C?Consider following C program:#include struct Test { int a; }; // Taken one member to avoid undefined behavior typedef struct Test t; typedef struct Test t; int main(void) { t a; a.a=9; printf("%d",a.a); return 0; } When compiling with gcc 4.8.1 it gives following warnings:5 [Warning] redefinition of typedef 't' [-Wpedantic]4 [Note] previous declaration of 't' was hereI know that -pedantic-errors can be used to get strict confirmance with C standard. So this is gcc extension.But now consider equivalent C++ program: (See live demo here C++ Shell )#include struct Test { int a; }; typedef struct Test t; typedef struct Test t; int main() { t T{9}; std::cout<::Int" do?Is using typedef in C++ considered a bad practice? Mayukh Sarkar, C++, C, C++11, Linux, system programming, bash scripting, driver de

 

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