CODEWITHSUNDEEP
c++gcccompilationcompiler-errorsg++
Derek Chiang
Derek Chiang

Reputation: 3410

Compiling C++: undefined reference

I'm pretty new to C++ and I'm trying to compile my code. The command I'm using is g++ -o main --std=c++11 main.cpp channel.cpp. However I'm getting the following error message:

/tmp/ccLuJs81.o: In function `main':
main.cpp:(.text+0x26): undefined reference to `gsc::Channel<int>::Channel()'
main.cpp:(.text+0x3a): undefined reference to `gsc::Channel<int>::put(int)'
main.cpp:(.text+0x4e): undefined reference to `gsc::Channel<int>::get(bool)'
collect2: error: ld returned 1 exit status

Does anyone know what's going on here? Thanks a lot!

Upvotes: 0

Views: 921

Answers (1)

Dietmar K&#252;hl
Dietmar K&#252;hl

Reputation: 154025

Seems you declared a template in a header and defined it in a C++ file. This won't work. If you don't define your template in a header, you need to explicitly instantiate it in your C++ file, e.g. ,using

template class gcs::Channel<int>;

after the definition of all the methods.

Upvotes: 6

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