undefined reference when link with g++

[xtcsin]

I write two files:

//SelectSort.cpp
#include<iostream>

using namespace std;

template <class T>
void SelectionSort(T p[],int n)
{
}

//main.cpp
#include<iostream>
#include<iomanip>

using namespace std;
template <class T>
void SelectionSort(T p[],int n);

int main()
{

int p[8]={1,7,3,6,2,8,3,4};
SelectionSort<int>(p,8);

return 0;
}

then i compile the sorce file with

g++ -c SelectSort.cpp -o SelectSort.o
g++ -c main.cpp -o main.o
g++ -o main main.o SelectSort.o

the error when linking is :

main.o: In function `main':
main.cpp.text+0x9c): undefined reference to `void SelectionSort<int>(int*, int)'
collect2: ld returned 1 exit status

[markkuk]

You must include the template class definition in the file it's used instead of trying to compile it separately. See: http://www.parashift.com/c++-faq-lit...html#faq-35.12