#include <iostream>
#include <vector>
#include <string>
 
using namespace std;
 
template <typename T>
size_t Get(const T& data)
{
	return 444;
}
 
template <typename T>
struct Data
{
    std::vector<T> data;
};
 
template <typename T>
size_t Get(const Data<T>& data) {
    return data.data.size();
}
 
int main() {
    std::cout << Get<>(0) << std::endl;  // expected output is 444
    std::cout << Get<>(Data<int>{}) << std::endl;  // expected output is 0
    return 0;
}

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