Undefined symbols Variadic function

Asked Jan 16 '18 at 01:27

Active Jan 16 '18 at 01:32

Viewed 319 times

I am trying to create a method that allows for a variable number of inputs. I was trying to implement this answer (see the code below) however, I got an error when I tried to run my code.

Code

header:

template<typename T, typename... Args>
void vSend ( T tIn, Args... AArgs );
template <typename T>
void vSend ( T tIn );

CPP

template<typename T, typename... Args>
void Connector::vSend ( T tIn, Args... AArgs )
{
    pPacketToSend << tIn;

    vSend(AArgs...);
}

template <typename T>
void Connector::vSend ( T tIn )
{
    pPacketToSend << tIn;

    tSocket.send(pPacketToSend);
}

Error

Undefined symbols for architecture x86_64:
  "void Connector::vSend<int, int>(int, int)", referenced from:
      Updater::Update(sf::Image*) in updatedirector.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Edit (Answer)

Turns out templates may only be implemented in the header file.

edited Jan 16 '18 at 01:32

asked Jan 16 '18 at 01:27

zoecarver

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@AlexanderHuszagh is probably right. pudility, can you throw us a bone and tell us what is in a header and what isn't? – user4581301 Jan 16 '18 at 01:30
@user4581301 sorry about that, I have updated my question. – zoecarver Jan 16 '18 at 01:34
It's an exact duplicate then. You must put all templates in header files. – Alex Huszagh Jan 16 '18 at 02:41

Undefined symbols Variadic function

Code

Error

Edit (Answer)

0 Answers0