NAME¶

std::iter_move(std::reverse_iterator) - std::iter_move(std::reverse_iterator)

Synopsis¶

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)
{
std::cout << rem << '[' << size(v) << "] {";
for (char comma[]{0, 0}; auto const& s : v)
std::cout << comma << ' ' << std::quoted(s), comma[0] = ',';
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 casts the result of dereferencing an object to its associated
(C++20) rvalue reference type
(customization point object)
iter_move casts the result of dereferencing the underlying iterator to
(C++20) its associated rvalue reference type
(function)
move obtains an rvalue reference
(C++11) (function template)
move_if_noexcept obtains an rvalue reference if the move constructor does not
(C++11) throw
(function template)
forward forwards a function argument
(C++11) (function template)
ranges::move moves a range of elements to a new location
(C++20) (niebloid)
ranges::move_backward moves a range of elements to a new location in backwards order
(C++20) (niebloid)

Category:¶

* conditionally noexcept