# std::list<T,Allocator>::insert_range

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< cpp‎ | container‎ | list

template< container-compatible-range<T> R > iterator insert_range( const_iterator pos, R&& rg ); |  | (since C++23)

Inserts, in non-reversing order, copies of elements in rg before pos.

No iterators or references are invalidated.

Each iterator in the range rg is dereferenced exactly once.

The behavior is undefined if rg overlaps with the container.

### Parameters

pos | - | iterator before which the content will be inserted (pos may be the end() iterator).
rg | - | a container compatible range, that is, an `input_range` whose elements are convertible to `T`.
Type requirements
- `T` must be EmplaceConstructible into `list` from *ranges::begin(rg). Otherwise, the behavior is undefined.

### Return value

An `iterator` that points at the copy of the first element inserted into `list` or at pos if rg is empty.

### Notes

Feature-test macro | Value | Std | Comment
--- | --- | --- | ---
`__cpp_lib_containers_ranges` | 202202L | (C++23) | Ranges-aware construction and insertion

### Example

Run this code

    #include <algorithm>
    #include <cassert>
    #include <iterator>
    #include <list>
    #include <vector>

    int main()
    {
        auto container = std::list{1, 2, 3, 4};
        auto pos = std::next(container.begin(), 2);
        assert(*pos == 3);
        const auto rg = std::vector{-1, -2, -3};

    #ifdef __cpp_lib_containers_ranges
        container.insert_range(pos, rg);
    #else
        container.insert(pos, rg.cbegin(), rg.cend());
    #endif
        assert(std::ranges::equal(container, std::list{1, 2, -1, -2, -3, 3, 4}));
    }

### See also

insert | inserts elements (public member function)
prepend_range (C++23) | adds a range of elements to the beginning (public member function)
append_range (C++23) | adds a range of elements to the end (public member function)

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