C++Talk.NET C++ language newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  templated function with vector          C++Talk.NET Forum Index -> C++ language (comp.lang.c++) View previous topic :: View next topic   Author Message Daniel L Elliott Guest Posted: Fri Oct 29, 2004 7:54 pm    Post subject: templated function with vector Hello, I am feeling very confused right now. The following code gives me an error: X.h: template <typename T> ILuint startImage(vector<vector imageData); X.cpp: template<typename T> void X::startImage(vector<vector imageData){blah} test.cpp: vector<vector testImage1(10); X.startImage(testImage1); gcc 3.3.2 gives the following error: /home/dane/myLibraries/image/testDriver.cpp:25: undefined reference to`unsigned X::startImage<double>(std::vector<std::vector std::allocator, std::allocator<std::vector > >)' Am I not using templates correctly? It appears to have the correct function. Thank you very much for any assistance I might receive! - dan elliott Back to top Victor Bazarov Guest Posted: Fri Oct 29, 2004 7:54 pm    Post subject: Re: templated function with vector Daniel L Elliott wrote: Quote: I am feeling very confused right now. The following code gives me an error: X.h: template <typename T ILuint startImage(vector imageData); ^^^^^^ Quote: X.cpp: template<typename T void X::startImage(vector imageData){blah} ^^^^ test.cpp: vector<vector testImage1(10); X.startImage(testImage1); gcc 3.3.2 gives the following error: /home/dane/myLibraries/image/testDriver.cpp:25: undefined reference to`unsigned X::startImage<double>(std::vector<std::vector std::allocator, std::allocator<std::vector > >)' Am I not using templates correctly? It appears to have the correct function. It appears you don't. V Back to top Daniel L Elliott Guest Posted: Fri Oct 29, 2004 8:04 pm    Post subject: Re: templated function with vector On Fri, 29 Oct 2004 15:54:53 -0400, Victor Bazarov wrote: Quote: Daniel L Elliott wrote: I am feeling very confused right now. The following code gives me an error: X.h: template <typename T ILuint startImage(vector imageData); ^^^^^^ X.cpp: template<typename T void X::startImage(vector imageData){blah} ^^^^ test.cpp: vector<vector testImage1(10); X.startImage(testImage1); gcc 3.3.2 gives the following error: /home/dane/myLibraries/image/testDriver.cpp:25: undefined reference to`unsigned X::startImage<double>(std::vector<std::vector std::allocator, std::allocator<std::vector > >)' Am I not using templates correctly? It appears to have the correct function. It appears you don't. V I am not above total stupidity. I tried to simplify the example, and forgot to change ILuint startImage to void X::startImage in the example. It should read: X.h: template <typename T> void startImage(vector<vector imageData); X.cpp: template<typename T> void X::startImage(vector<vector imageData){blah} test.cpp: vector<vector testImage1(10); X.startImage(testImage1); gcc 3.3.2 gives the following error: /home/dane/myLibraries/image/testDriver.cpp:25: undefined reference to`unsigned X::startImage<double>(std::vector<std::vector std::allocator, std::allocator<std::vector > >)' Thanks anyway. - dan Back to top John Harrison Guest Posted: Fri Oct 29, 2004 8:16 pm    Post subject: Re: templated function with vector "Daniel L Elliott" <dan_elliott_at_cox_dot_net (AT) spam_is_pathetic (DOT) com> wrote in message news:pan.2004.10.29.20.04.27.697158 (AT) spam_is_pathetic (DOT) com... Quote: On Fri, 29 Oct 2004 15:54:53 -0400, Victor Bazarov wrote: Daniel L Elliott wrote: I am feeling very confused right now. The following code gives me an error: X.h: template <typename T ILuint startImage(vector imageData); ^^^^^^ X.cpp: template<typename T void X::startImage(vector imageData){blah} ^^^^ test.cpp: vector<vector testImage1(10); X.startImage(testImage1); gcc 3.3.2 gives the following error: /home/dane/myLibraries/image/testDriver.cpp:25: undefined reference to`unsigned X::startImage<double>(std::vector<std::vector std::allocator, std::allocator<std::vector > >)' Am I not using templates correctly? It appears to have the correct function. It appears you don't. V I am not above total stupidity. I tried to simplify the example, and forgot to change ILuint startImage to void X::startImage in the example. It should read: X.h: template <typename T void startImage(vector imageData); X.cpp: template<typename T void X::startImage(vector imageData){blah} test.cpp: vector<vector testImage1(10); X.startImage(testImage1); gcc 3.3.2 gives the following error: /home/dane/myLibraries/image/testDriver.cpp:25: undefined reference to`unsigned X::startImage<double>(std::vector<std::vector std::allocator, std::allocator<std::vector > >)' Thanks anyway. - dan I reckon this is the #1 post to this group. ALL TEMPLATE CODE MUST GO IN HEADER FILES. Most startimage out of X.cpp, put it in X.h and all will be well. Don't books on templates teach this? Where did you learn about templates that didn't mention this basic fact? And what about all the other people who post similar problems to yours. Please tell, I'm genuinely curious. john Back to top Daniel L Elliott Guest Posted: Fri Oct 29, 2004 8:45 pm    Post subject: Re: templated function with vector On Fri, 29 Oct 2004 21:16:48 +0100, John Harrison wrote: Quote: "Daniel L Elliott" <dan_elliott_at_cox_dot_net (AT) spam_is_pathetic (DOT) com> wrote in message news:pan.2004.10.29.20.04.27.697158 (AT) spam_is_pathetic (DOT) com... On Fri, 29 Oct 2004 15:54:53 -0400, Victor Bazarov wrote: Daniel L Elliott wrote: I am feeling very confused right now. The following code gives me an error: X.h: template <typename T ILuint startImage(vector imageData); ^^^^^^ X.cpp: template<typename T void X::startImage(vector imageData){blah} ^^^^ test.cpp: vector<vector testImage1(10); X.startImage(testImage1); gcc 3.3.2 gives the following error: /home/dane/myLibraries/image/testDriver.cpp:25: undefined reference to`unsigned X::startImage<double>(std::vector<std::vector std::allocator, std::allocator<std::vector > >)' Am I not using templates correctly? It appears to have the correct function. It appears you don't. V I am not above total stupidity. I tried to simplify the example, and forgot to change ILuint startImage to void X::startImage in the example. It should read: X.h: template <typename T void startImage(vector imageData); X.cpp: template<typename T void X::startImage(vector imageData){blah} test.cpp: vector<vector testImage1(10); X.startImage(testImage1); gcc 3.3.2 gives the following error: /home/dane/myLibraries/image/testDriver.cpp:25: undefined reference to`unsigned X::startImage<double>(std::vector<std::vector std::allocator, std::allocator<std::vector > >)' Thanks anyway. - dan I reckon this is the #1 post to this group. ALL TEMPLATE CODE MUST GO IN HEADER FILES. Most startimage out of X.cpp, put it in X.h and all will be well. Don't books on templates teach this? Where did you learn about templates that didn't mention this basic fact? And what about all the other people who post similar problems to yours. Please tell, I'm genuinely curious. john Hey, thanks for the information. I am not sure how this fact has eluded me over the years. I even have books on c++ and they don't explictly say it (although their examples always put definitions in the header). You need to create a webpage entitled: function templates only belong in the header and have a bunch of people link to it so dummies like myself can find it via Google! - dan Back to top John Harrison Guest Posted: Fri Oct 29, 2004 8:46 pm    Post subject: Re: templated function with vector Quote: Don't books on templates teach this? Where did you learn about templates that didn't mention this basic fact? And what about all the other people who post similar problems to yours. Please tell, I'm genuinely curious. john Hey, thanks for the information. I am not sure how this fact has eluded me over the years. I even have books on c++ and they don't explictly say it (although their examples always put definitions in the header). You need to create a webpage entitled: function templates only belong in the header and have a bunch of people link to it so dummies like myself can find it via Google! I guess its templates dirty little secret, people don't really like to talk about it. But it is in the FAQ, http://www.parashift.com/c++-faq-lite/containers-and-templates.html john Back to top Default User Guest Posted: Fri Oct 29, 2004 8:52 pm    Post subject: Re: templated function with vector Daniel L Elliott wrote: Quote: Hey, thanks for the information. I am not sure how this fact has eluded me over the years. I even have books on c++ and they don't explictly say it (although their examples always put definitions in the header). You need to create a webpage entitled: function templates only belong in the header and have a bunch of people link to it so dummies like myself can find it via Google! Maybe even better would be to gather up all kinds of information on such problems that crop all the time, give it a catchy name like Frequently Asked Questions or sumpin. http://www.parashift.com/c++-faq-lite/containers-and-templates.html#faq-34.12 Brian Back to top Daniel L Elliott Guest Posted: Sat Oct 30, 2004 12:16 am    Post subject: Re: templated function with vector On Fri, 29 Oct 2004 13:52:20 -0700, Default User wrote: Quote: Daniel L Elliott wrote: Hey, thanks for the information. I am not sure how this fact has eluded me over the years. I even have books on c++ and they don't explictly say it (although their examples always put definitions in the header). You need to create a webpage entitled: function templates only belong in the header and have a bunch of people link to it so dummies like myself can find it via Google! Maybe even better would be to gather up all kinds of information on such problems that crop all the time, give it a catchy name like Frequently Asked Questions or sumpin. http://www.parashift.com/c++-faq-lite/containers-and-templates.html#faq-34.12 Brian Brian, Jon, et al. Thanks for the link. It is full of excellent information. Stuff that I have been wondering about. Sadly, this webpage did not come up during my search. Search engines like Google typically use the size and location of text as a measure of its importance. If this is really such an annoyance, somebody should devote an entire page to it (no matter how ugly it is). I know I would have appreciated it. I also noticed that this is referred to as "the FAQ." Does this imply that this is the defacto, community C++ FAQ? Thanks again! - dan Back to top Victor Bazarov Guest Posted: Sat Oct 30, 2004 1:51 am    Post subject: Re: templated function with vector "Daniel L Elliott" <dan_elliott_at_cox_dot_net (AT) spam_is_pathetic (DOT) com> wrote... Quote: [..] http://www.parashift.com/c++-faq-lite/containers-and-templates.html#faq-34.12 Brian Brian, Jon, et al. Thanks for the link. It is full of excellent information. Stuff that I have been wondering about. Sadly, this webpage did not come up during my search. Search engines like Google typically use the size and location of text as a measure of its importance. If this is really such an annoyance, somebody should devote an entire page to it (no matter how ugly it is). I know I would have appreciated it. I also noticed that this is referred to as "the FAQ." Does this imply that this is the defacto, community C++ FAQ? It is de facto the FAQ for this newsgroup. It definitely is mentioned here many times, so if you cared to read the newsgroup before posting to it, you would see it. Also, http://groups.google.com/ is a very good source of Q that have been A'ed already. It's too late in comp.lang.c++, but if you ever decide to visit another NG, try looking for the FAQ right away _before_ posting. It is always a good idea to read FAQ. Saves you and others tons of time. Saves bandwidth too. 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