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

 

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std::forward_list

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forward_list::forward_list forward_list::~forward_list forward_list::operator= forward_list::assign forward_list::assign_range (C++23)   forward_list::get_allocator Element access forward_list::front Iterators forward_list::before_beginforward_list::cbefore_begin forward_list::beginforward_list::cbegin forward_list::endforward_list::cend Capacity forward_list::empty forward_list::max_size	Modifiers forward_list::clear forward_list::emplace_front forward_list::push_front forward_list::insert_after forward_list::emplace_after forward_list::erase_after forward_list::insert_range_after (C++23) forward_list::prepend_range (C++23) forward_list::pop_front forward_list::resize forward_list::swap Operations forward_list::merge forward_list::splice_after forward_list::removeforward_list::remove_if forward_list::reverse forward_list::unique forward_list::sort
Non-member functions
operator==operator<=> (C++20) swap(std::forward_list) erase(std::forward_list)erase_if(std::forward_list) (C++20)(C++20)	operator!=operator<operator>operator<=operator>= (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)
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)