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Error Redefinition Of Operator

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Error Redefinition Of 'class

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Error Redefinition Of ‘class

Sign up Friend operator in template struct raises redefinition error up vote 4 down vote favorite 2 Consider this code: template struct A{ friend std::ostream& operator<<(std::ostream& out, K x) { // Do some output return out; } }; int main(){ A i; A j; } It does not compile, because the two instantiations of A instantiate the operator<< two times error redefinition of c++ with the same signature, so I receive this error: test.cpp:26:25: error: redefinition of ‘std::ostream& operator<<(std::ostream&, int)’ friend std::ostream& operator<<(std::ostream& out, K x) { return out; } ^ test.cpp:26:25: error: ‘std::ostream& operator<<(std::ostream&, int)’ previously defined here How to fix this? How can I have a friend operator in a template, when that operator might have the same signature for two different instantiations? How can I solve this without triggering a redefinition error? c++ templates c++11 operator-overloading share|improve this question edited Aug 14 '14 at 11:32 asked Aug 14 '14 at 11:26 gexicide 15.9k84380 Do you need T in definition of operator<. And as Neil said, it's up to K to provide an implementation of the operator, and int already has one. –leemes Aug 14 '14 at

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Error Redefinition Of ‘struct

from "example.com"url:textsearch for "text" in urlselftext:textsearch error redefinition of 'struct iovec' for "text" in self post contentsself:yes (or self:no)include (or exclude) error redefinition of default argument self postsnsfw:yes (or nsfw:no)include (or exclude) results marked as NSFWe.g. subreddit:aww site:imgur.com dogsee the search faq http://stackoverflow.com/questions/25306944/friend-operator-in-template-struct-raises-redefinition-error for details.advanced search: by author, subreddit...this post was submitted on 17 Jun 20150 points (50% upvoted)shortlink: remember mereset passwordloginSubmit a new text postlearnprogrammingsubscribeunsubscribe276,169 readers444 users here nowWelcome to LearnProgramming! Asking Questions - Offering Help Please https://www.reddit.com/r/learnprogramming/comments/3a6on2/c_error_redefinition_of_operator/ read our Frequently Asked Questions section before posting. Message the Moderators with suggestions or to rescue posts from the spam filter Chat on our official IRC at #learnprogramming on Freenode using a client or webchat! Related Programming Subreddits Posting Guidelines Ask questions the smart way. Learn how to write the perfect question. Read the full guidelines for asking questions. DO NOT DELETE YOUR POST Please use a descriptive title and specify the language or tech you're working with. Good Example: [C++] Segmentation fault while writing to array in a for loop Bad

it. Here http://www.cplusplus.com/forum/beginner/42113/ is the header file (RuntimeException.h) 1
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#ifndef EXC_H #define EXC_H #include // provides string #include // provides ostream using std::string; // make string accessible class RuntimeException { // generic run-time exception private: string errorMsg; public: RuntimeException(const string& err); string getMessage() const; error redefinition }; std::ostream& operator<<(std::ostream& out, const RuntimeException& e); #endif Here is the cpp file (exceptions.cpp): 1
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#include "RuntimeException.h" RuntimeException::RuntimeException(const string& err) { errorMsg = err; } RuntimeException::string getMessage() const { return errorMsg; } std::ostream& operator<<(std::ostream& out, const RuntimeException& e) { return out << e.getMessage(); error redefinition of }; When I run "g++ -c exceptions.cpp", I get: exceptions.cpp:4: error: redefinition of ‘RuntimeException::RuntimeException(const std::string&)’ RuntimeException.h:13: error: ‘RuntimeException::RuntimeException(const std::string&)’ previously defined here exceptions.cpp:7: error: ‘string’ in class ‘RuntimeException’ does not name a type exceptions.cpp: In function ‘std::ostream& operator<<(std::ostream&, const RuntimeException&)’: exceptions.cpp:11: error: redefinition of ‘std::ostream& operator<<(std::ostream&, const RuntimeException&)’ RuntimeException.h:17: error: ‘std::ostream& operator<<(std::ostream&, const RuntimeException&)’ previously defined here I really cannot understand why the compiler thinks I am redefining when I think I am not. Please help. May 2, 2011 at 12:35pm UTC Moschops (7074) RuntimeException::string getMessage() const { This is all mixed-up. Try string RuntimeException::getMessage() const { instead. May 2, 2011 at 12:54pm UTC TheNoobie (199) Change RuntimeException::string getMessage() const to string RuntimeException::getMessage() const Last edited on May 2, 2011 at 12:54pm UTC May 2, 2011 at 12:

 

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