vec.cc

#include <bits/stdc++.h>
using namespace std;

template<typename T, size_t n>
struct Vec{
    typedef vector<typename Vec<T, n-1>::V> V;
    static V init(const T &x, initializer_list<size_t>::iterator it){
        const size_t s = *it;
        return V(s, Vec<T, n-1>::init(x, ++it));
    }
    static V init(const T &x, initializer_list<size_t> d){
        assert(d.size() == n);
        return init(x, d.begin());
    }
    static V init(initializer_list<size_t> d){
        assert(d.size() == n);
        return init(T(), d.begin());
    }
};
template<typename T>
struct Vec<T, 0>{
    typedef T V;
    static V init(const T &x, initializer_list<size_t>::iterator it){ return x; }
};

int main(){
    auto v = Vec<int, 4>::init(numeric_limits<int>::max(), {3, 3, 3, 3});
    cout << v[0][0][0][0] << endl;
    return 0;
}

vec2.cc

#include <bits/stdc++.h>
using namespace std;

template<typename T, size_t n>
struct Vec{
    typedef vector<typename Vec<T, n-1>::V> V;
    template<typename Size, typename... Sizes>
    static V init(const T &x, Size size, const Sizes&... sizes){
        return V(size, Vec<T, n-1>::init(x, sizes...));
    }
    template<typename Size, typename... Sizes>
    static V init(Size size, const Sizes&... sizes){
        return V(size, Vec<T, n-1>::init(T(), sizes...));
    }
};
template<typename T>
struct Vec<T, 0>{
    typedef T V;
    static V init(const T &x){ return x; }
};

int main(){
    auto v = Vec<int, 4>::init(3, 3, 3, 3);
    cout << v[0][0][0][0] << endl;
    return 0;
}