Compiling error

[seforo]

Hi guys,
I have a class declared and defined in AliHLTMessageQueue.h and AliHLTMessageQueue.cxx respectively

template<typename MessageType, int kSignalNumber = SIGUSR1>
class AliHLTMessageQueue{.//declarations etc..}

I also have a file queueTest.cxx where i call AliHLTMessageQueue methods.
I declare my object like as:
AliHLTMessageQueue<int> queue(20000000);
And I made this call somewhere in queueTest.cxx:
queue.Push(m, COUNT,true,0,true);

I compile my files with Makefile and this is the line in the make file:
g++ -O3 -Wall -Werror -DNDEBUG -pthread $(CXXFlags) AliHLTMessageQueue.cxx queueTest.cxx -o $@

I get the error:
undefined reference to`AliHLTMessageQueue<int, 10>::Push(int const*, unsigned, int, bool, float, bool)'

I DON'T UNDERSTAND THIS BECAUSE I INCLUDE THE SOURCE FILE WHERE I DEFINED THE METHOD Push WHILE COMPILING. Any suggestions?

[weaknessforcats]

You are using templates.

Templates are neither declararions or definitions. They are more like macros. That is, they are a pattern the compiler uses. When you create a variable from a template, the compiler makes a copy of the template and replaces the placeholder typename with your type used to create the varaible.

That means you do not include a source file butyou do include the template. In this case the template would be the class declaration plus all of the class methods. These should be in a header file and you should include this header in all source files that use the template.