std::list<T,Allocator>::splice

 

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::list

Member functions

list::list

list::~list

list::operator=

list::assign

list::get_allocator

Element access

list::front

list::back

Iterators

list::beginlist::cbegin (C++11)

list::endlist::cend (C++11)

list::rbeginlist::crbegin (C++11)

list::rendlist::crend (C++11)

Capacity

list::empty

list::size

list::max_size

Modifiers

list::clear

list::insert

list::emplace (C++11)

list::erase

list::push_front

list::emplace_front (C++11)

list::pop_front

list::push_back

list::emplace_back (C++11)

list::pop_back

list::resize

list::swap

Operations

list::merge

list::splice

list::removelist::remove_if

list::reverse

list::unique

list::sort

Deduction guides(C++17)

 

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

Transfers elements from one list to another.

No elements are copied or moved, only the internal pointers of the list nodes are re-pointed. The behavior is undefined if: get_allocator() != other.get_allocator(). No iterators or references become invalidated, the iterators to moved elements remain valid, but now refer into *this, not into other.

1) Transfers all elements from other into *this. The elements are inserted before 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) Transfers the element pointed to by it from other into *this. The element is inserted before the element pointed to by pos.

3) Transfers the elements in the range [first, last) from other into *this. The elements are inserted before the element pointed to by pos. The behavior is undefined if pos is an iterator in the range [first,last).

Parameters

pos	-	element before which the content will be inserted
other	-	another container to transfer the content from
it	-	the element to transfer from other to *this
first, last	-	the range of elements to transfer from other to *this

Return value

(none)

Exceptions

Throws nothing.

Complexity

1-2) Constant.

3) Constant if other refers to the same object as *this, otherwise linear in std::distance(first, last).

Example

Run this code

#include <iostream>
#include <list>
 
std::ostream& operator<<(std::ostream& ostr, const std::list<int>& list)
{
    for (auto &i : list) {
        ostr << " " << i;
    }
    return ostr;
}
 
int main ()
{
    std::list<int> list1 = { 1, 2, 3, 4, 5 };
    std::list<int> list2 = { 10, 20, 30, 40, 50 };
 
    auto it = list1.begin();
    std::advance(it, 2);
 
    list1.splice(it, list2);
 
    std::cout << "list1: " << list1 << "\n";
    std::cout << "list2: " << list2 << "\n";
 
    list2.splice(list2.begin(), list1, it, list1.end());
 
    std::cout << "list1: " << list1 << "\n";
    std::cout << "list2: " << list2 << "\n";
}

Output:

list1:  1 2 10 20 30 40 50 3 4 5
list2: 
list1:  1 2 10 20 30 40 50
list2:  3 4 5

See also

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