Error Redefinition Of Template Class
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Error Redefinition Of ‘class
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Error Redefinition Of Typedef
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Error Redefinition Of Typedef 'gliststore'
favorite I am using two stacks to implement a queue class. My header file looks like: #ifndef _MyQueue_h #define _MyQueue_h using namespace std; template class MyQueue { public: MyQueue(); ~MyQueue(); void enqueue(T element); T peek(); void dequeue(); int size(); bool empty(); private: int count; stack stk1; stack stk2; }; # include "MyQueue.cpp" # endif And my cpp (implementation) file looks like: #include #include "MyQueue.h" using namespace error redefinition of ‘struct std; template MyQueue::MyQueue() { count = 0; } template MyQueue::~ MyQueue() { } template void MyQueue::enqueue(T element) { stk1.push(element); count ++; } (other functions omitted). However, using Xcode 4.5, it keeps saying that my functions (MyQueue, ~MyQueue, enqueue, peek, etc.) are redefined. Can anyone help me to clarify where have I redefined them? Thank you c++ class stack queue redefinition share|improve this question asked Nov 13 '13 at 22:02 Hayden Coyle 11112 2 You should never include a source file (i.e files ending in .cpp, .cc, or .C). Also, make sure to include the header file in which your stack is defined, unless you are using the STL stack. –noobProgrammer Nov 13 '13 at 22:07 add a comment| 3 Answers 3 active oldest votes up vote 5 down vote You're trying something which I really don't like. It's a pretence. Remove #include "MyQueue.cpp", replace it with the content of MyQueue.cpp, delete the file MyQueue.cpp. Now everything will work. You are trying to pretend the template code can be split into header file and implementation file. But because it can't you have to cheat by including the implementation file in the header file. It's less confusing if you
Sign in Pricing Blog Support Search GitHub This repository Watch error redefinition of 'struct iovec' 119 Star 1,506 Fork 234 nodejs/nan Code Issues 17 error redefinition of default argument Pull requests 13 Projects 0 Wiki Pulse Graphs New issue error: redefinition of ‘template v8::Local #420 Closed binarykitchen opened this Issue Aug 22, 2015 · 10 comments Projects None yet Labels None yet Milestone http://stackoverflow.com/questions/19965300/c-error-message-redefinition-of-functions No milestone Assignees No one assigned 4 participants binarykitchen commented Aug 22, 2015 due to a nan error i fail to compile the sharp library: $ npm i 1 staging / > sharp@0.11.1 install /home/michael-heuberger/binarykitchen/code/videomail.io/node_modules/sharp > node-gyp rebuild make: Entering directory '/home/michael-heuberger/binarykitchen/code/videomail.io/node_modules/sharp/build' CXX(target) Release/obj.target/sharp/src/common.o CXX(target) Release/obj.target/sharp/src/metadata.o https://github.com/nodejs/nan/issues/420 In file included from ../src/metadata.cc:4:0: ../node_modules/nan/nan.h:324:27: error: redefinition of ‘template v8::Local Nan::imp::NanEnsureHandleOrPersistent(const v8::Local&)’ NAN_INLINE v8::Local NanEnsureHandleOrPersistent(const v8::Local &val) { ^ ../node_modules/nan/nan.h:319:17: note: ‘template v8::Handle Nan::imp::NanEnsureHandleOrPersistent(v8::Handle&)’ previously declared here v8::Handle NanEnsureHandleOrPersistent(const v8::Handle &val) { ^ ../node_modules/nan/nan.h:344:27: error: redefinition of ‘template v8::Local Nan::imp::NanEnsureLocal(v8::Handle&)’ NAN_INLINE v8::Local NanEnsureLocal(const v8::Handle &val) { ^ ../node_modules/nan/nan.h:334:27: note: ‘template v8::Local Nan::imp::NanEnsureLocal(const v8::Local&)’ previously declared here NAN_INLINE v8::Local NanEnsureLocal(const v8::Local &val) { ^ ../node_modules/nan/nan.h:757:13: error: ‘node::smalloc’ has not been declared , node::smalloc::FreeCallback callback ^ ../node_modules/nan/nan.h:757:35: error: expected ‘,’ or ‘...’ before ‘callback’ , node::smalloc::FreeCallback callback ^ ../node_modules/nan/nan.h: In function ‘v8::Local NanNewBufferHandle(char*, size_t, int)’: ../node_modules/nan/nan.h:761:50: error: ‘callback’ was not declared in this scope v8::Isolate::GetCurrent(), data, length, callback, hint); ^ ../node_modules/nan/nan.h:761:60: error: ‘hint’ was not declared in this scope v8::Isolate::GetCurrent(), data, length, callback, hint); ^ ../node_modules/nan/nan.h: In function ‘v8::Local NanNewBufferHandle(const char*, uint32_t)’: ../n
File Message 7 http://www.cplusplus.com/forum/beginner/31266/ J:\folder\searchSort.h redefinition of `template<class elemType> int binarySearch(const elemType*, https://isocpp.org/wiki/faq/templates int, const elemType&)' 7 J:\folder\searchSort.h `template int binarySearch(const elemType*, int, const elemType&)' previously declared here Previously declared? At the same location in the same file? Anybody know what could be the error redefinition problem? If it's important, I'm dealing with searching and sorting, as implied by the title of the file, and I did make a copy of the original file for experimenting purposes, in case the copy became fubar, I'd have the error redefinition of original. I'm working with the copy here. Thanks for reading! Nov 9, 2010 at 4:48am UTC Disch (13766) Sounds like you didn't guard your header and it's being included multiple times. See this: http://cplusplus.com/forum/articles/10627/#msg49679 Nov 9, 2010 at 5:40am UTC Erdrigard (26) "Incidental multiple includes." That about sums it up. Thanks. I actually have another problem with this program and was tempted to post it here, but it's more appropriate in a separate topic. Last edited on Nov 9, 2010 at 5:53am UTC Topic archived. No new replies allowed. C++ Information Tutorials Reference Articles Forum Forum BeginnersWindows ProgrammingUNIX/Linux ProgrammingGeneral C++ ProgrammingLoungeJobs Home page | Privacy policy© cplusplus.com, 2000-2016 - All rights reserved - v3.1Spotted an error? contact us
Navigation FAQ Home FAQ RSS Feed FAQ Help Search this Wiki Go to Page Upcoming Events Fall ISO C++ standards meeting Nov 7-12, Issaquah, WA, USA Meeting C++ Nov 18-19, Berlin, Germany ACCU 2017 Apr 26-29, Bristol, UK Tweets by @isocpp Wiki Home > templates View templates Save to: Instapaper Pocket Readability Templates What's the idea behind templates? A template is a cookie-cutter that specifies how to cut cookies that all look pretty much the same (although the cookies can be made of various kinds of dough, they'll all have the same basic shape). In the same way, a class template is a cookie cutter for a description of how to build a family of classes that all look basically the same, and a function template describes how to build a family of similar looking functions. Class templates are often used to build type safe containers (although this only scratches the surface for how they can be used). What's the syntax / semantics for a "class template"? Consider a container class Array that acts like an array of integers: // This would go into a header file such as "Array.h" class Array { public: Array(int len=10) : len_(len), data_(new int[len]) { } ~Array() { delete[] data_; } int len() const { return len_; } const int& operator[](int i) const { return data_[check(i)]; } // Subscript operators often come in pairs int& operator[](int i) { return data_[check(i)]; } // Subscript operators often come in pairs Array(const Array&); Array& operator= (const Array&); private: int len_; int* data_; int check(int i) const { if (i < 0 || i >= len_) throw BoundsViol("Array", i, len_); return i; } }; Repeating the above over and over for Array of float, of char, of std::string, of Array-of-std::string, etc, would become tedious. Instead, you add the template before the class definition (the T can be any identifier you want, T is just the most commonly used one, especiall