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Linker Error Undefined Reference To Template Class

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Related 887Why can templates only be implemented in the header file?26Templates: Use forward declarations to reduce compile time?2Does template class specialization/explicit instatiation improves compilation/linker speed?1Strange “undefined reference” to template members4“undefined reference” asked 6 years ago viewed 17407 times active 1 year ago Linked 0 What are the unresolved externals? 1 Compiler error with template member function 0 C++ Class Template Issue 0 However this requires you to anticipate how your template will be used and, as a general solution, is counter-intuitive. See my answer. –Aaron McDaid Jan 6 '12 at 3:05 @AaronMcDaid: Then find the relevant line/examples/samples, quote the same and enlighten us before downvoting. –Alok Save Jan 6 '12 http://cdbug.org/undefined-reference/linker-error-undefined-reference-to-template.php

Remember that add and greater aren't functions, they're function templates. Browse other questions tagged c++ templates compilation linker or ask your own question. Is a food chain without plants plausible? Comments Allander: Quick and helpful reply. other

C++ Undefined Reference To Template Class Method

Linker error? 4 replies Hey guys, I'm trying to get my code to compile. Join them; it only takes a minute: Sign up “Undefined symbols” linker error with simple template class up vote 10 down vote favorite 4 Been away from C++ for a few Converting Game of Life images to lists Difficult limit problem involving sine and tangent 4 dogs have been born in the same week. The linker error is resolved.

Is a food chain without plants plausible? Here's what you can do: main.cpp #include "myclass.hpp" int main() { // ... } myclass.hpp #ifndef MYCLASS #define MYCLASS template class MyClass { T val; public: MyClass(T val_); } #define Function templates are only compiled when they are used with a specific template argument, we call that instantiation. Template Function Linker Error template?

Can I stop this homebrewed Lucky Coin ability from being exploited? C++ Template Function Undefined Reference How to concatenate three files (and skip the first line of one file) an send it as inputs to my program? Is there a word for spear-like? check this link right here now c++ templates unsatisfiedlinkerror share|improve this question edited May 3 '12 at 18:43 Flexo♦ 54.9k16103167 asked Jun 16 '09 at 2:34 Ryan_IRL 306314 Exact error messages would be helpful. –sean

Can't a user change his session information to impersonate others? Extern Template This post has been edited by JackOfAllTrades: 12 August 2010 - 12:58 PM Was This Post Helpful? 1 Back to top MultiQuote Quote + Reply #4 jjl Engineer Reputation: 1179 Likewise, only when you actually use the template with a certain type can the compiler generate the actual function, and compile it. When export for templates would be more supported this wouldn't be the case though but right now it still hardly can be used.

C++ Template Function Undefined Reference

cola) without any more work. http://stackoverflow.com/questions/22595015/c-class-template-undefined-reference-to-function However, I'm curious: Why do you want that? C++ Undefined Reference To Template Class Method CR won't display photo unless it is stored directly into DataBase. Undefined Reference To Template Member Function asked 7 years ago viewed 26342 times active 2 years ago Linked 1 undefined reference to 0 Another strange compiler error: calling a templated function which gives undefined referenes -2 error

What is the 'dot space filename' command doing in bash? http://cdbug.org/undefined-reference/linker-error-undefined-reference-to-class-constructor.php one translation unit) and that the explicit instantation is placed after the definition of all the functions (i.e. Reputation: 6243 Posts: 24,012 Joined: 23-August 08 Re: g++ undefined reference with class template Posted 12 August 2010 - 12:58 PM I'm no template expert, but I believe you need to My declaration in my .h file is as follows: template T* find_name(std::vector v, std::string name); When I compile, I get this linker error when I call the function: Error Template Implementation In Cpp

It doesn't need to know what the function does, just that it looks like void Frobnicate(int, float), or whatever its signature is. If your compiler supports it, you can declare your template as "extern" and use it the way you would any other member, at the cost of additional link-time work. Can an umlaut be written as a line in handwriting? http://cdbug.org/undefined-reference/linker-error-undefined-reference-class.php Is it correct to write "teoremo X statas, ke" in the sense of "theorem X states that"?

What to do with my out of control pre teen daughter How to know if a meal was cooked with or contains alcohol? Template Instantiation If you have only a few different instances to create, and know them beforehand, then you can use "explicit instantiation" This works something like this: At the top of gene.cpp add However, I don't think G++ has proper support, so you need to include the template function's definition in the header so the translation unit can use it.

The compiler won't compile the constructors cola::cola(...) and cola::cola(...) until it is forced to do so.

The compiler must have access to the implementations of templated functions at the points where they're instantiated. Though, you can use some ways to implement templated functions in another source file (though, I'll never use them). There are advantages and disadvantages to both answers and your choice will depend on context. Template Class C++ Find first non-repetitive char in a string Why aren't there direct flights connecting Honolulu, Hawaii and London, UK?

I'll just add that this is often why in addition to .h and .cpp files in a project. First, I have used it in a … Undefined reference to a class I made in a .h file 5 replies Hello DaniWeb, its been a long time! Any ideas? news void TemporaryFunction () { TestTemp TempObj; TestTemp TempObj2; } share|improve this answer answered Dec 31 '12 at 7:35 o KB o 527715 I really like this method, but is