Linker Error Undefined Reference To Static Member
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C++ Undefined Reference To Static Class Member
About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting undefined reference to static member function c++ ads with 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 c++ undefined reference to static vector million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Resolving a linker error: undefined reference to static class members up vote 4 down vote favorite My code is Arduinoish. I turned on verbose compiling so I could verify that all the .o files are indeed getting
Undefined Reference To Private Static Variable
passed to the linker correctly, and they are (linker command below). This leads me to believe that it is some sort of syntax error. Googling for the error "undefined reference to in function" produces a lot of results with answers like "add foo.o to your linker command like so", etc. I hope the solution is as simple as a missing dot or -> somewhere. I'm getting this series of errors in one file, from the linker: SerialServoControl.cpp.o: In function `SerialServoControl::send(int, int)': SerialServoControl.cpp:31: undefined reference to `SerialServoControl::_serial' SerialServoControl.cpp:31: undefined reference to `SerialServoControl::_serial' SerialServoControl.cpp.o: In function `SerialServoControl::init(char, char)': SerialServoControl.cpp:9: undefined reference to `SerialServoControl::_tx' SerialServoControl.cpp:10: undefined reference to `SerialServoControl::_rx' The .h file: #ifndef SERIALSERVOCONTROL_H #define SERIALSERVOCONTROL_H #include "NewSoftSerial.h" class SerialServoControl { public: // rx, tx static NewSoftSerial _serial;//(9, 8); int _servo_id; static char _tx; static char _rx; static void init(char tx, char rx); static void send(int servo_id, int angle); void setup(int servo_id); void set(int spot); }; #endif and the .cpp file: #ifndef SERIALSERVOCONTROL_CPP #define SERIALSERV
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C++ Private Static Member
6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Undefined reference to static class member up vote 158 down vote favorite 54 Can anyone explain why following http://stackoverflow.com/questions/5603101/resolving-a-linker-error-undefined-reference-to-static-class-members code won't compile? At least on g++ 4.2.4. And more interesting, why it will compile when I cast MEMBER to int? #include
. This means the angle brackets aren't interpreted as HTML. –Steve Jessop Nov 7 '08 at 19:03 cheers :) 10 character min rule is sometimes annoying ;) –Pawel Piatkowski Nov 8 '08 at 12:30 add a comment| 7 Answers 7 active oldest votes up vote 162 down vote accepted You need to actually define the static member somewhere (after the class definition). Try this: class Foo { /* ... */ }; const int Foo::MEMBER; int main() { /* ... */ } That should get rid of the undefined reference. share|improve this answer edited Jan 4 '14 at 21:37 user529758 answered Nov 7 '08 at 17:57 Drew Hall 19.8k74669 3 Good point, inline static const integer initialization creates a scoped integer constant which you can't take the address of, and vector takes a reference param. –Evan Teran Nov 7 '08 at 18:08 8 This answer only addresses the first part of the question. The second part is much more interesting: Why does adding a NOP cast make it work without requiring the external declaration? –nobar Feb 1 '11 at 0:48 25 I just spent a good bit of time figu
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies http://stackoverflow.com/questions/9282354/static-variable-link-error of this site About Us Learn more about Stack Overflow the company Business http://stackoverflow.com/questions/16743926/linker-error-for-a-static-member-of-class Learn more about hiring developers 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 community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign undefined reference up static variable link error [duplicate] up vote 31 down vote favorite 1 This question already has an answer here: What is an undefined reference/unresolved external symbol error and how do I fix it? 25 answers I'm writing C++ code on a mac. Why do I get this error when compiling?: Undefined symbols for architecture i386: "Log::theString", referenced from: Log::method(std::string) in libTest.a(Log.o) undefined reference to ld: symbol(s) not found for architecture i386 clang: error: linker command failed with exit code 1 (use -v to see invocation) Not sure if my code is wrong or I have to add additional flags to Xcode. My current XCode configurations are the default ones for a 'static library' project. My code: Log.h------------ #include
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers 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 community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up linker error for a static member of class [duplicate] up vote 0 down vote favorite This question already has an answer here: What is an undefined reference/unresolved external symbol error and how do I fix it? 25 answers I am trying to find a solution to a linker error for a static member of a class Here is the code: //node.h class Node{ public: static vector