#include <vector>
#include <iostream>
 
template<typename T>
void output_helper(std::vector<T>*) {}
 
void output_helper(std::vector<int>*) {
	std::cout << "vecInt: ";
}
 
void output_helper(std::vector<double>*) {
	std::cout << "vecDouble: ";
}
 
template <typename T>
void output(std::vector<T>* vO) {
    output_helper(vO);
 
    for (size_t i = 0; i < vO->size(); i++) {
        std::cout << (*vO).at(i) << " ";
    }
    std::cout << std::endl;
}
 
int main() {
	std::vector<int> v{1, 2, 3};
	output(&v);
	return 0;
}

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