Template method in c++ static library

Question

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Why can templates only be implemented in the header file?

I have written template method in non-template class. This project is static library. Then I have written test console application and wanted to use this method. But there is compilation error (unresolved external). Then I asked google and have found forum (http://cboard.cprogramming.com/cplusplus-programming/108544-static-libraries-template-functions.html) where 'matsp' said: "The entire template implementation needs to be in a header file when using templates.". I did like he said and it works great. Why?

take a look [here](http://stackoverflow.com/questions/5612791/c-template-and-header-files) — Ivaylo Strandjev, Jan 09 '13 at 15:15

score 0 · Accepted Answer · answered Jan 09 '13 at 15:14

0

Because that's the way it is with templates in C++... Their definition has to be visible in every translation unit that is used.

answered Jan 09 '13 at 15:14

K-ballo

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Thanks, but you have answered me just "because". I need to know more... – Lex Jan 09 '13 at 15:40

Template method in c++ static library

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