std::forward_list::begin,std::forward_list::cbegin(3)

NAME
std::forward_list::begin,std::forward_list::cbegin - std::forward_list::begin,std::forward_list::cbegin

Synopsis
   iterator begin() noexcept; (1) (since C++11)
   const_iterator begin() const noexcept; (2) (since C++11)
   const_iterator cbegin() const noexcept; (3) (since C++11)
   Returns an iterator to the first element of the forward_list.
   If the forward_list is empty, the returned iterator will be equal to end().
   range-begin-end.svg

Parameters
   (none)

Return value
   Iterator to the first element.

Complexity
   Constant.

Example
// Run this code
 #include <algorithm>
 #include <iostream>
 #include <numeric>
 #include <string>
 #include <forward_list>
 int main()
 {
     std::forward_list<int> nums{1, 2, 4, 8, 16};
     std::forward_list<std::string> fruits{"orange", "apple", "raspberry"};
     std::forward_list<char> empty;
     // Print forward_list.
     std::for_each(nums.begin(), nums.end(), [](const int n) { std::cout << n << ' '; });
     std::cout << '\n';
     // Sums all integers in the forward_list nums (if any), printing only the result.
     std::cout << "Sum of nums: "
               << std::accumulate(nums.begin(), nums.end(), 0) << '\n';
     // Prints the first fruit in the forward_list fruits, checking if there is any.
     if (!fruits.empty())
         std::cout << "First fruit: " << *fruits.begin() << '\n';
     if (empty.begin() == empty.end())
         std::cout << "forward_list 'empty' is indeed empty.\n";
 }

Output:
 1 2 4 8 16
 Sum of nums: 31
 First fruit: orange
 forward_list 'empty' is indeed empty.

See also
   end returns an iterator to the end
   cend (public member function)
   begin
   cbegin returns an iterator to the beginning of a container or array
   (C++11) (function template)
   (C++14)