std::vector::end, std::vector::cend

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

int main()
{
    std::vector<int> nums {1, 2, 4, 8, 16};
    std::vector<std::string> fruits {"", "", ""};
    std::vector<char> empty;

    //  vector.
    std::for_each(nums.begin(), nums.end(), [](const int n) { std::cout << n << ' '; });
    std::cout << '\n';

    //     vector nums (  ),  .
    std::cout << " : "
              << std::accumulate(nums.begin(), nums.end(), 0) << '\n';

    //     vector fruits,     .
    if (!fruits.empty())
        std::cout << " : " << *fruits.begin() << '\n';

    if (empty.begin() == empty.end())
        std::cout << "vector 'empty' -  .\n";
}