Convert vector {1,2,3} into string “1-2-3” AS DIGITS

Question

I want to display numbers in a std::vector on a screen, but on its way to the recipient, I need to stuff these numbers into a std::st

Answer 1

Yet, another example:

std::vector v{1,2,3};

std::ostringstream str;
std::transform(v.begin(), v.end(), std::ostream_iterator(str, "-"), [](unsigned char c){ return '0' + c;});

std::cout << str.str();

[edit]

unfortunately above will add additional trailing - symbol, to prevent it - more complicated code is necessary:

std::transform(v.begin(), v.end(), std::ostream_iterator(str), [&](auto c){
    return (str.rdbuf()->in_avail() ? "-" : "") + std::to_string(c);
});