From cppreference.com
iteratorinsert_after(const_iteratorpos,constT&value); (1) (since C++11)iteratorinsert_after(const_iteratorpos,T&&value); (2) (since C++11)iteratorinsert_after(const_iteratorpos,size_typecount,constT&value); (3) (since C++11)template<classInputIt>iteratorinsert_after(const_iteratorpos,InputItfirst,InputItlast); (4) (since C++11)iteratorinsert_after(const_iteratorpos,std::initializer_list<T>ilist); (5) (since C++11)Inserts elements after the specified position in the container.
1,2) Inserts value after the element pointed to by pos.
3) Inserts count copies of the value after the element pointed to by pos.
4) Inserts elements from range [first, last) after the element pointed to by pos. The behavior is undefined if first and last are iterators into *this.
5) Inserts elements from initializer list ilist.
No iterators or references are invalidated.
Parameters
pos - iterator after which the content will be inserted value - element value to insert count - number of copies to insert first, last - the pair of iterators defining the source
of elements to insert ilist - initializer list to insert the values from Type requirements -InputIt must meet the requirements of
. Return value
1,2) Iterator to the inserted element.
3) Iterator to the last element inserted, or pos if count==0.
4) Iterator to the last element inserted, or pos if first==last.
5) Iterator to the last element inserted, or pos if ilist is empty.
Exceptions
If an exception is thrown for any reason, these functions have no effect (
strong exception safety guarantee
).
Complexity
1,2) Constant.
3) Linear in count.
4) Linear in std::distance(first,last).
5) Linear in ilist.size().
Example
Run this code
#include<forward_list>#include<iostream>#include<string>#include<vector>voidprint(conststd::forward_list<int>&list){std::cout<<"list: {";for(charcomma[3]={'\0',' ','\0'};inti:list){std::cout<<comma<<i;comma[0]=',';}std::cout<<"}\n";}intmain(){std::forward_list<int>ints{1,2,3,4,5};print(ints);// insert_after (2)autobeginIt=ints.begin();ints.insert_after(beginIt,-6);print(ints);// insert_after (3)autoanotherIt=beginIt;++anotherIt;anotherIt=ints.insert_after(anotherIt,2,-7);print(ints);// insert_after (4)conststd::vector<int>v={-8,-9,-10};anotherIt=ints.insert_after(anotherIt,v.cbegin(),v.cend());print(ints);// insert_after (5)ints.insert_after(anotherIt,{-11,-12,-13,-14});print(ints);}Output:
list: {1, 2, 3, 4, 5} list: {1, -6, 2, 3, 4, 5} list: {1, -6, -7, -7, 2, 3, 4, 5} list: {1, -6, -7, -7, -8, -9, -10, 2, 3, 4, 5} list: {1, -6, -7, -7, -8, -9, -10, -11, -12, -13, -14, 2, 3, 4, 5} See also