std::vector to string with custom delimiter

Question

I would like to copy the contents of a vector to one long string with a custom delimiter. So far, I\'ve tried:

// .h
string getLabe         


        

Answer 1

faster variant:

vector x = {"1", "2", "3"};
string res;
res.reserve(16);

std::accumulate(std::begin(x), std::end(x), 0,
                [&res](int &, string &s)
                {
                    if (!res.empty())
                    {
                        res.append(",");
                    }
                    res.append(s);
                    return 0;
               });

it doesn't create interim strings, but just allocate memory once for the whole string result and appends each elem to the end of &res