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#include <iostream>
 
#include <vector>
 
// for the header file
template<>
int std::vector<int>::sum();
 
//for the object file
template<>
int std::vector<int>::sum() {
	int s=0;
	for(auto v = this->begin(); v!=this->end(); ++v) s+=*v;
	return s;
}
 
 
int main() {
	std::vector<int> numbers;
	numbers.push_back(5);
	numbers.push_back(2);
	numbers.push_back(6);
	numbers.push_back(9);
 
	std::cout << numbers.sum() << std::endl;
 
	return 0;
}

prog.cpp:7:27: error: no member function ‘sum’ declared in ‘std::vector<int>’
 int std::vector<int>::sum();
                           ^
prog.cpp:11:27: error: no member function ‘sum’ declared in ‘std::vector<int>’
 int std::vector<int>::sum() {
                           ^
prog.cpp: In function ‘int main()’:
prog.cpp:25:23: error: ‘class std::vector<int>’ has no member named ‘sum’
  std::cout << numbers.sum() << std::endl;
                       ^

Standard output is empty