std::insert_iterator::operator=

From cppreference.com
(1)
insert_iterator<Container>&
    operator=( typename Container::const_reference value );
(until C++11)
insert_iterator<Container>&
    operator=( const typename Container::value_type& value );
(since C++11)
insert_iterator<Container>&
    operator=( typename Container::value_type&& value );
(2) (since C++11)

Inserts the given value value to the container.

1) Results in iter = container->insert(iter, value); ++iter;
2) Results in iter = container->insert(iter, std::move(value)); ++iter;

Parameters

value - the value to insert

Return value

*this

Notes

This function exploits the signature compatibility between hinted insert for associative containers (such as std::set::insert) and positional insert for sequential containers (such as std::vector::insert).

Example