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# std::forward_list::splice_after

From cppreference.com
< cpp‎ | container‎ | forward list

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` is a valid iterator in *this or is the before_begin() iterator. 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 this == &other
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)`.

### [edit] 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

### [edit] Return value

(none)

### [edit] Complexity

1) Linear in the size of `other`
2) Constant
3) Linear in std::distance(first, last)

### [edit] 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

### [edit] See also

merge | merges two sorted lists (public member function) [edit]
remove remove_if | removes elements satisfying specific criteria (public member function) [edit]

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