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#include <iostream>
using namespace std;
template <typename ...Chars>
double _kmh(Chars ...chars);
double _kmh()
{
return 0;
}
template<size_t n>
struct factor
{
enum { value = 10 * factor<n - 1>::value };
};
template<>
struct factor<0>
{
enum {value = 1};
};
template <typename ...Chars>
double _kmh(char c, Chars ...chars)
{
return (c - '0') * factor<sizeof...(Chars)>::value + _kmh(chars ...);
}
int main()
{
cout << _kmh('1', '2', '3') << '\n';
}
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