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std::forward_list<T,Allocator>:: erase_after

From cppreference.net
C++
Containers library
std::forward_list
Member functions
Non-member functions
(until C++20) (until C++20) (until C++20) (until C++20) (until C++20)
Deduction guides (C++17)
iterator erase_after ( const_iterator pos ) ;
(1) (since C++11)
(constexpr since C++26)
iterator erase_after ( const_iterator first, const_iterator last ) ;
(2) (since C++11)
(constexpr since C++26)

Removes specified elements from the container.

1) Removes the element following pos .
If the iterator following pos is not dereferceable, the behavior is undefined.
2) Removes the elements in the range ( first , last ) .
If any iterator in the range ( first , last ) is not dereferceable, the behavior is undefined.

Contents

Parameters

pos - iterator to the element preceding the element to remove
first, last - the pair of iterators defining the 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 .

Exceptions

Throws nothing.

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

clears the contents
(public member function)