std::forward_list::erase_after(3)

NAME
std::forward_list::erase_after - std::forward_list::erase_after

Synopsis
   iterator erase_after( const_iterator pos ); (1) (since C++11)
   iterator erase_after( const_iterator first, const_iterator last ); (2) (since C++11)
   Removes specified elements from the container.
   1) Removes the element following pos.
   2) Removes the elements following first until last.

Parameters
   pos - iterator to the element preceding the element to remove
   first, last - range of elements to remove

Return value
   1) Iterator to the element following the erased one, or end() if no such element
   exists.
   2) last

Complexity
   1) Constant.
   2) Linear in distance between first and last.

Example
// Run this code
 #include <forward_list>
 #include <iostream>
 #include <iterator>
 int main()
 {
     std::forward_list<int> l = {1, 2, 3, 4, 5, 6, 7, 8, 9};
 // l.erase(l.begin()); // Error: no function erase()
     l.erase_after(l.before_begin()); // Removes first element
     for (auto n : l)
         std::cout << n << ' ';
     std::cout << '\n';
     auto fi = std::next(l.begin());
     auto la = std::next(fi, 3);
     l.erase_after(fi, la);
     for (auto n : l)
         std::cout << n << ' ';
     std::cout << '\n';
 }

Output:
 2 3 4 5 6 7 8 9
 2 3 6 7 8 9

See also
   clear clears the contents
         (public member function)