std::vector::insert

iterator insert( iterator pos, const T& value ); iterator insert( const_iterator pos, const T& value );	(1)	(until C++11) (since C++11)
iterator insert( const_iterator pos, T&& value );	(2)	(since C++11)
void insert( iterator pos, size_type count, const T& value ); iterator insert( const_iterator pos, size_type count, const T& value );	(3)	(until C++11) (since C++11)
template< class InputIterator > void insert( iterator pos, InputIterator first, InputIterator last); template< class InputIterator > iterator insert( const_iterator pos, InputIterator first, InputIterator last );	(4)	(until C++11) (since C++11)
iterator insert( const_iterator pos, std::initializer_list<T> ilist );	(5)	(since C++11)

Inserts elements to specified position in the container.

1-2) inserts value before the element pointed to by pos

3) inserts count copies of the value before the element pointed to by pos

4) inserts elements from range [first, last) before the element pointed to by pos

5) inserts elements from initializer list ilist.

Causes reallocation if the new size() is greater than the old capacity().Iterators and references to the elements between pos and the end of the container are invalidated.

Parameters

pos	-	element before which the content will be inserted
value	-	element value to insert
first, last	-	the range of elements to insert, can't be iterators into container for which insert is called
ilist	-	initializer list to insert the values from

Return value

1-2) iterator pointing to the inserted value

3) iterator pointing to the first element inserted, or pos if count==0.

4) iterator pointing to the first element inserted, or pos if first==last.

5) iterator pointing to the first element inserted, or pos if ilist is empty.

Complexity

1-2) Constant plus linear in the distance between pos and end of the container.

3) Linear in count plus linear in the distance between pos and end of the container.

4) Linear in std::distance(first, last) plus linear in the distance between pos and end of the container.

5) Linear in ilist.size() plus linear in the distance between pos and end of the container.

See also

emplace (C++11)	constructs element in-place (public member function)
push_back	adds elements to the end (public member function)