std::forward_list<T,Allocator>::insert_range_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
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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)

 

template< container-compatible-range<T> R > iterator insert_range_after( const_iterator pos, R&& rg );		(since C++23)

Inserts, in non-reversing order, the copies of elements in rg before pos. Each iterator in the range rg is dereferenced exactly once.

pos must be any dereferenceable iterator in the range [begin(), end()) or the before_begin() iterator (thus, end() is not a valid argument for pos).

No iterators or references become invalidated.

The behavior is undefined if rg overlaps with the container.

Parameters

pos	-	an iterator after which the content will be inserted
rg	-	a container compatible range, that is, an input_range whose elements are convertible to T
Type requirements
- T must be EmplaceConstructible into forward_list from *ranges::begin(rg). Otherwise, the behavior is undefined.

Return value

An iterator that points at the copy of the last element inserted into forward_list or at pos if rg is empty.

Complexity

Linear in size of rg.

Notes

Feature-test macro	Value	Std	Feature
__cpp_lib_containers_ranges	202202L	(C++23)	Ranges-aware construction and insertion

Example

Run this code

#include <algorithm>
#include <cassert>
#include <forward_list>
#include <iterator>
#include <vector>
 
int main()
{
    auto container = std::forward_list{1, 2, 3, 4};
    auto pos = std::next(container.cbegin());
    assert(*pos == 2);
    const auto rg = std::vector{-1, -2, -3};
 
#ifdef __cpp_lib_containers_ranges
    container.insert_range_after(pos, rg);
#else
    container.insert_after(pos, rg.cbegin(), rg.cend());
#endif
 
    assert(std::ranges::equal(container, std::vector{1, 2, -1, -2, -3, 3, 4}));
}

See also

prepend_range (C++23)	adds a range of elements to the beginning (public member function)
insert_after	inserts elements after an element (public member function)
emplace_after	constructs elements in-place after an element (public member function)