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lang-cpp
operator<<is in a .cpp file, and it isn't going to instantiate itself. You instantiatearray, so it looks like you know what to do when a templete is defined in a .cpp file. Butarrayinstantiations are not doing anything tooperator<<. You need explicit instantiations for it as well.arrayin the .cpp file. Un-closing. Note to others who are tempted to repeat the same mistake: please don't.