join function implementation in c++

join.cpp

#include <iostream>
#include <numeric>
#include <string>
#include <vector>

template <class T>
std::string join(std::vector<T> vec, char connector) {
    if (vec.size() == 0) {
        return "";
    }
    if (vec.size() == 1) {
        return std::to_string(vec[0]);
    }
    return std::accumulate(
        std::next(vec.begin()), vec.end(), std::to_string(vec[0]),
        [connector](std::string a, T b) {
            return std::move(a) + connector + std::to_string(b);
        });
}

int main() {
    std::vector<int> vec{1, 2, 3, 4, 5, 6, 7, 9, 10};
    // 1.2.3.4.5.6.7.9.10
    std::cout << join(vec, '.') << std::endl;
    return 0;
}