#include <iostream>
#include <vector>

template< typename T = double> struct Box;
template <typename T, int size > struct Arr;

template<>
struct Box<>{
    double val;
    Box(double v): val(v){}
    friend std::ostream& operator<<(std::ostream& o, const Box<double>& b){
        return o <<b.val;}
};

template<>
struct Box<int>{
    int val;
    Box(int v): val(v){}
    friend std::ostream& operator<<(std::ostream& o, const Box<int>& b){
        return o<<b.val;}
};

template <typename T, int size>
struct Arr{
    int arr[size];
    Arr(){
        for (int i=1; i<=size; i++){
            arr[i-1] = i;
        }
    }
    int* begin(){return *arr;}
    int* end(){return *(arr+size);}

};

using make_Box = Box<>;

int main(){
std::cout<< Box<int>(26.02) << std::endl; //wypisuje typ Box<int>
std::cout<< make_Box(26.02) <<std::endl;  //wypisuje typ Box<...>
for (auto _ : Arr<<Box<int>,5>()){
std::cout<< _ << ", " <<std::endl;}
}
/*output:
26
26.02
1, 2, 3, 4, 5,
*/