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C++ Undefined Reference To Static Class Member


What is the inner cover of the winter shoes called in English? Include string Log::theString; to your cpp file share|improve this answer answered Feb 14 '12 at 18:47 Lol4t0 10.6k21648 add a comment| Not the answer you're looking for? c++ xcode static-libraries clang static-methods share|improve this question asked Feb 14 '12 at 18:42 subzero 1,36942333 marked as duplicate by Luchian Grigorec++ Users with the c++ badge can single-handedly close c++ Dynamic SOQL query How to tell if your flight has an air-bridge or stairs? http://compsyscon.com/undefined-reference/undefined-reference-to-static-const-member.html

Try adding in a int SCREENWIDTH; before you assign it in the source not just header file share|improve this answer edited Aug 24 '12 at 23:41 answered Aug 24 '12 at more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed The class Helloworld has a declaration of its static data member x, but there is no definition of that data member. Putting them in the class just declares that they are there, but something still needs to define them. Get More Info

C++ Undefined Reference To Static Class Member

c++ arduino static-members share|improve this question edited Apr 17 '11 at 12:53 Peter Mortensen 10.4k1372108 asked Apr 9 '11 at 5:29 voxobscuro 1,39611430 add a comment| 4 Answers 4 active oldest What is this shrub/plant? Is there a name for this kind of comparator? Inside your .cpp file your can do so like this: NewSoftSerial SerialServoControl::_serial(9, 8); char SerialServoControl::_tx = 0; char SerialServoControl::_rx = 0; Put appropriate initial values; I just assumed the comment was

static members are considered special and is very similar to a global variable. Any suggestions? How do dragons not burn themselves? C++ Private Static Member Variable Is using "you" to refer to anyone, not the person you're talking to, a known, specific grammar form?

Customizing the Personalization Rules Listing sequence with rules Loading... Undefined Reference To Static Function Exception vs empty result set when the inputs are technically valid, but unsatisfiable Backdoor account in passwd file What is this game from this promotional image for joysticks? Of course, this means you'll have to define a relevant constructor for the NewSoftSerial class. http://stackoverflow.com/questions/8612206/linker-error-when-using-static-members Why static variable is not working [Linker error] undefined reference to `A::i' #include class A { public: static int i; static int init(){ i = 1; } }; int WINAPI

Why doesn't my (battery-powered) light work in the cold? Qualified Id In Declaration Before All Aboard the Kolmogorov Complexity Train Generate all brace-strings of length n How to describe very damaging natural weapon attacks from a weak creature What is this shrub/plant? I love your observation about "unary +"! How to set up love interests for player characters Backdoor account in passwd file What is this game from this promotional image for joysticks?

Undefined Reference To Static Function

A minimal broken example of a static field declared but not defined could be : template class A { public: static T val; static void init() { val=0; } }; Shortest code to produce non-deterministic output Why are the railings in Rivendell so low? C++ Undefined Reference To Static Class Member PrimitiveParser Is the equation pH+pOH=14 still valid at a different temperature? Undefined Reference To Static Member Function C++ Just like with template functions, the implementation is responsible for sorting out duplicates and ending up with only one copy. –Pete Becker Dec 17 '13 at 18:49 @PeteBecker: Oh,

I'm avoiding global variables for that very reason. weblink Beyond that, there are several books for various aspects but I'm not aware of any one book. Worked like a charm. :) Faq Reply With Quote Share This Thread  Tweet This + 1 this Post To Linkedin Subscribe to this Thread  Subscribe to This Thread « I'm getting a bizarre linker error when using static or global variables in one of my files. C++ Undefined Reference To Static Const Member

Louis Illinois Posts 3,283 Rep Power 26 class static objects must also be declared outside any function or class just like normal globals. Hope this helps. I realize this is probably not the right place but can you recommend a book (de, eng, fr, it) that explains the more complicated aspects of cpp? –user3049681 Dec 17 '13 navigate here Somehwere in your source code you need int Helloworld::x; or, if 0 isn't an appropriate initial value, add an initializer.

Why doesn't my (battery-powered) light work in the cold? C++ Class Static Variable How to describe very damaging natural weapon attacks from a weak creature What checkin and checkout date to pick? How could a smaller country successfully take control of a much larger country?

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My code: Log.h------------ #include #include using namespace std; class Log{ public: static void method(string arg); private: static string theString ; }; Log.cpp ---- #include "Log.h" #include void Log::method(string share|improve this answer answered Feb 14 '12 at 18:47 Luchian Grigore 170k29303464 Rather initializes instead of defines, no (just asking)? –Vyktor Feb 14 '12 at 18:49 @Vyktor Is it ethical to use proprietary (closed-source) software for scientific computation? C++ Initialize Static Member Note that I still recommend to avoid global variables!

Why is Cuba still leasing Guantanamo Bay to the US? What can I do about a rock climbing ban? What "actually" happens at T-minus-0 Do handstand push-ups hit all the three shoulder heads? http://compsyscon.com/undefined-reference/undefined-reference-to-winmain-c.html If you had a reference to a Foo somewhere, it would probably work.

Undefined reference to static member data Thread: Linker Errors! more hot questions question feed lang-cpp about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture / Recreation share|improve this answer answered Jun 20 at 7:12 TinyT 349416 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google Sign up asked 3 years ago viewed 25769 times active 3 years ago Blog How Do Software Developers in New York, San Francisco, London and Bangalore… Linked 160 Undefined reference to static class

Undefined reference to static member data I have 3 files, header, implementation, and test code. Damn, all this time I've been second-guessing the linker and making this particular problem for myself! –yzt Dec 17 '13 at 18:56 add a comment| 3 Answers 3 active oldest votes share|improve this answer edited Jan 15 '13 at 5:10 answered Jan 15 '13 at 5:04 billz 32.8k44076 What if it is private? that could qualify for stackoverflow.com/questions/1995113/strangest-language-featu‌re if it isn't there already... –Andre Holzner Dec 3 '10 at 13:45 1 Also worth noting that MSVC accepts the non-cast version without complaints. –porges

The tester program will send a string to "setFormat" and it will change the private static variable "format" to that string. What you need to do is simply to provide a definition for your static member variable: class Helloworld { public: static int x; void foo(); }; int Helloworld::x = 0; // Yes it's certainly weird that for an object x of type T, the expression "(T) x" can be used to bind a const ref while plain "x" can't. What if passport is lost and home country has no diplomatic presence?

PrimitiveParser Does using documentation as a developer make me look unprofessional? i.e. How could a smaller country successfully take control of a much larger country?