std::forward_list::splice_after

 

C++

Language

Standard Library Headers

Freestanding and hosted implementations

Named requirements

Language support library

Concepts library (C++20)

Diagnostics library

Utilities library

Strings library

Containers library

Iterators library

Ranges library (C++20)

Algorithms library

Numerics library

Input/output library

Localizations library

Regular expressions library (C++11)

Atomic operations library (C++11)

Thread support library (C++11)

Filesystem library (C++17)

Technical Specifications

 

Containers library

array (C++11)

vector

deque

forward_list (C++11)

list

set

multiset

map

multimap

unordered_set (C++11)

unordered_multiset (C++11)

unordered_map (C++11)

unordered_multimap (C++11)

stack

queue

priority_queue

span (C++20)

 

std::forward_list

Member functions

forward_list::forward_list

forward_list::~forward_list

forward_list::operator=

forward_list::assign

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::insert_after

forward_list::emplace_after

forward_list::erase_after

forward_list::push_front

forward_list::emplace_front

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

Deduction guides(C++17)

 

void splice_after( const_iterator pos, forward_list& other );	(1)	(since C++11)
void splice_after( const_iterator pos, forward_list&& other );	(1)	(since C++11)
void splice_after( const_iterator pos, forward_list& other,                    const_iterator it );	(2)	(since C++11)
void splice_after( const_iterator pos, forward_list&& other,                    const_iterator it );	(2)	(since C++11)
void splice_after( const_iterator pos, forward_list& other,                    const_iterator first, const_iterator last );	(3)	(since C++11)
void splice_after( const_iterator pos, forward_list&& other,                    const_iterator first, const_iterator last );	(3)	(since C++11)

Moves elements from another forward_list to *this.

No elements are copied. pos must be either a deferenceable valid iterator into *this or the before_begin() iterator (in particular, end() is not a valid argument for pos). The behavior is undefined if get_allocator() != other.get_allocator(). No iterators or references become invalidated, the iterators to the moved elements now refer into *this, not into other.

1) Moves all elements from other into *this. The elements are inserted after the element pointed to by pos. The container other becomes empty after the operation. The behavior is undefined if other refers to the same object as *this.

2) Moves the element pointed to by the iterator following it from other into *this. The element is inserted after the element pointed to by pos. Has no effect if pos==it or if pos==++it.

3) Moves the elements in the range (first, last) from other into *this. The elements are inserted after the element pointed to by pos. The element pointed-to by first is not moved. The behavior is undefined if pos is an iterator in the range (first,last).

Parameters

pos	-	element after which the content will be inserted
other	-	another container to move the content from
it	-	iterator preceding the iterator to the element to move from other to *this
first, last	-	the range of elements to move from other to *this

Return value

(none)

Complexity

1) Linear in the size of other

2) Constant

3) Linear in std::distance(first, last)

Example

Demonstrates the meaning of open interval (first, last) in the third form of splice_after(): the first element of l1 is not moved.

Run this code

#include <iostream>
#include <forward_list>
 
int main()
{
    std::forward_list<int> l1 = {1,2,3,4,5};
    std::forward_list<int> l2 = {10,11,12};
 
    l2.splice_after(l2.cbegin(), l1, l1.cbegin(), l1.cend());
    // not equivalent to l2.splice_after(l2.cbegin(), l1);
 
    for(int n : l1)
        std::cout << n << ' ';
    std::cout << '\n';
 
    for(int n : l2)
        std::cout << n << ' ';
    std::cout << '\n';
}

Output:

1
10 2 3 4 5 11 12

See also

merge	merges two sorted lists (public member function)
removeremove_if	removes elements satisfying specific criteria (public member function)