iter_move (std::common_iterator)

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

The function body is equivalent to: return std :: ranges:: iter_move ( std :: get < I > ( i. var ) ) ; .

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

If i. var does not hold an I object (i.e. an iterator), the behavior is undefined.

Parameters

Return value

An rvalue reference or a prvalue temporary.

Complexity

Constant.

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);
}

p[3] { "Andromeda", "Cassiopeia", "Phoenix" }
q[0] {  }
p[3] { "", "", "Phoenix" }
q[2] { "Andromeda", "Cassiopeia" }

Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

See also