iter_move(std::common_iterator)

Since C++20

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

# Declarations

friend constexpr decltype(auto) iter_move( const std::common_iterator& i )
noexcept(noexcept(ranges::iter_move(std::declval<const I&>()))
requires std::input_iterator<I>;

(since C++20)

# Parameters

# Return value

An rvalue reference or a prvalue temporary.

# Example

#include <iomanip>
#include <iostream>
#include <iterator>
#include <string>
#include <vector>
 
void print(auto const& rem, auto const& v)
{
    std::cout << rem << '[' << size(v) << "] { ";
    for (int o{}; auto const& s : v)
        std::cout << (o++ ? ", " : "") << std::quoted(s);
    std::cout << " }\n";
}
 
int main()
{
    std::vector<std::string> p{"Andromeda", "Cassiopeia", "Phoenix"}, q;
    print("p", p);
    print("q", q);
 
    using CTI = std::counted_iterator<std::vector<std::string>::iterator>;
    using CI = std::common_iterator<CTI, std::default_sentinel_t>;
    CI last{std::default_sentinel};
 
    for (CI first{{p.begin(), 2}}; first != last; ++first)
        q.emplace_back(/* ADL */ iter_move(first));
 
    print("p", p);
    print("q", q);
}

# Defect reports

DRApplied toBehavior as publishedCorrect behavior
LWG 3953C++20the return type was std::iter_rvalue_reference_tchanged to decltype(auto)

# See also