Template of ingredient class

[Trok]

I want create class with pattern of function. When I add definition of function to *.cpp file and call it in mainwindow.cpp, I have bugs:

mainwindow.o:-1: error: In function `ZN10MainWindowC2EP7QWidget':
mainwindow.cpp:6: undefined reference to `readmemory::readmemory()'
mainwindow.o:-1: error: In function `ZN10MainWindowC1EP7QWidget':
mainwindow.cpp:6: undefined reference to `readmemory::readmemory()'
mainwindow.o:-1: error: In function `ZN10MainWindow11startSearchEv':
mainwindow.cpp:46: undefined reference to `void readmemory::test<int>(int)'
:-1: error: collect2: ld returned 1 exit status

mainwindow.o:-1: error: In function `ZN10MainWindowC2EP7QWidget':
mainwindow.cpp:6: undefined reference to `readmemory::readmemory()'
mainwindow.o:-1: error: In function `ZN10MainWindowC1EP7QWidget':
mainwindow.cpp:6: undefined reference to `readmemory::readmemory()'
mainwindow.o:-1: error: In function `ZN10MainWindow11startSearchEv':
mainwindow.cpp:46: undefined reference to `void readmemory::test<int>(int)'
:-1: error: collect2: ld returned 1 exit status

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It's my exemplary code:
class.h

class Pattern{ 
template<typename T> void function(T); 
};

class Pattern{ 
template<typename T> void function(T); 
};

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class.cpp

template<typename T> 
void Pattern::function(T a) 
{ 
//code
}

template<typename T> 
void Pattern::function(T a) 
{ 
//code
}

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mainwindow.h

Pattern patternClass; 
int a; 
patternClass.function(a);

Pattern patternClass; 
int a; 
patternClass.function(a);

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I tried use "export" like in Visual Studio and include class.cpp to class.h, but it doesn't work. Is it possible to use template like in my test code?