iter_move (std::counted_iterator)

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

The function body is equivalent to return ranges:: iter_move ( i. base ( ) ) ; .

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

If i. count ( ) is equal to ​ 0 ​ , 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 (char comma[]{0, ' ', 0}; auto const& s : v)
        std::cout << comma << std::quoted(s), *comma = ',';
    std::cout << "}\n";
}
 
int main()
{
    std::vector<std::string> p{"Alpha", "Bravo", "Charlie"}, q;
    print("p", p);
    print("q", q);
 
    using RI = std::counted_iterator<std::vector<std::string>::iterator>;
 
    for (RI iter{p.begin(), 2}; iter != std::default_sentinel; ++iter)
        q.emplace_back(/* ADL */ iter_move(iter));
 
    print("p", p);
    print("q", q);
}

p[3] {"Alpha", "Bravo", "Charlie"}
q[0] {}
p[3] {"", "", "Charlie"}
q[2] {"Alpha", "Bravo"}

Defect reports

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

See also