# std::iter_move(std::reverse_iterator)

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< cpp‎ | iterator‎ | reverse iterator

friend constexpr std::iter_rvalue_reference_t<Iter> iter_move( const std::reverse_iterator& i ) noexcept(/* see below */); |  | (since C++20)

Casts the result of dereferencing the adjusted underlying iterator to its associated rvalue reference type.

The function body is equivalent to:

    auto tmp = i.base();
    return std::ranges::iter_move(--tmp);

This function template is not visible to ordinary unqualified or qualified lookup, and can only be found by argument-dependent lookup when `std::reverse_iterator<Iter>` is an associated class of the arguments.

### Parameters

i | - | a source reverse iterator.

### Return value

An rvalue reference or a prvalue temporary.

### Complexity

Constant.

### Exceptions

`noexcept` specification:
noexcept(

std::is_nothrow_copy_constructible_v<Iter> &&
noexcept(std::ranges::iter_move(--std::declval<Iter&>()))

)

### Example

Run this code

    #include <iomanip>
    #include <iostream>
    #include <iterator>
    #include <string>
    #include <vector>

    void print(auto const& rem, auto const& v) {
        for (std::cout << rem << "[" << size(v) << "] { "; auto const& s : v)
            std::cout << quoted(s) << " ";
        std::cout << "}\n";
    }

    int main()
    {
        std::vector<std::string> p { "Alpha", "Bravo", "Charlie" }, q;

        print("p", p), print("q", q);

        using RI = std::reverse_iterator<std::vector<std::string>::iterator>;

        for (RI iter{ p.rbegin() }, rend{ p.rend() }; iter != rend; ++iter) {
            q.emplace_back( /* ADL */ iter_move(iter) );
        }

        print("p", p), print("q", q);
    }

Possible output:

    p[3] { "Alpha" "Bravo" "Charlie" }
    q[0] { }
    p[3] { "" "" "" }
    q[3] { "Charlie" "Bravo" "Alpha" }

### See also

iter_move (C++20) | casts the result of dereferencing an object to its associated rvalue reference type (customization point object)
iter_move (C++20) | casts the result of dereferencing the underlying iterator to its associated rvalue reference type (function)
move (C++11) | obtains an rvalue reference (function template)
move_if_noexcept (C++11) | obtains an rvalue reference if the move constructor does not throw (function template)
forward (C++11) | forwards a function argument (function template)
ranges::move (C++20) | moves a range of elements to a new location (niebloid)
ranges::move_backward (C++20) | moves a range of elements to a new location in backwards order (niebloid)

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