tourist CPP debug template(partial)

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

template <typename A> string to_string(vector<A> v)
{
    bool first = true;
    string res = "[";
    for (const auto &x : v) {
        if (!first) {
            res += ",";
        }
        first = false;
        res += to_string(x);
    }
    res += "]";
    return res;
}
template <typename A, typename B> string to_string(pair<A, B> p)
{
    return "(" + to_string(p.first) + "," + to_string(p.second) + ")";
}
template <typename A, typename B, typename C> string to_string(tuple<A, B, C> p)
{
    return "(" + to_string(get<0>(p)) + "," + to_string(get<1>(p)) + "," + to_string(get<2>(p)) + ")";
}
template <typename A, typename B, typename C, typename D> string to_string(tuple<A, B, C, D> p)
{
    return "(" + to_string(get<0>(p)) + "," + to_string(get<1>(p)) + "," + to_string(get<2>(p)) + "," +
           to_string(get<3>(p)) + ")";
}
void debug_out() { cerr << endl; }
template <typename Head, typename... Tail> void debug_out(Head H, Tail... T)
{
    cerr << to_string(H) << " ";
    debug_out(T...);
}

int main(int argc, char **argv)
{
    pair<int, double> x{3, 5};
    vector<int> va{2, 3, 5};
    tuple<int, long, char> t3{2, (1ll << 50) - 51, 'z'};
    tuple<int, double, char, long> t4{0, 3e-5, 'b', 263};
    debug_out(x, va, t3, t4);
    /*
    debug_out(x);
    debug_out(va);
    debug_out(t3);
    debug_out(t4);
    */
};