std::move_iterator<Iter>:: operator*,->

From cppreference.com
C++
Iterator library
Iterator concepts
Iterator primitives
Algorithm concepts and utilities
Indirect callable concepts
Common algorithm requirements
(C++20)
(C++20)
(C++20)
Utilities
(C++20)
Iterator adaptors
Range access
(C++11) (C++14)
(C++14) (C++14)
(C++11) (C++14)
(C++14) (C++14)
(C++17) (C++20)
(C++17)
(C++17)
std::move_iterator
reference operator * ( ) const ;
(1) (since C++11)
(constexpr since C++17)
pointer operator - > ( ) const ;
(2) (since C++11)
(constexpr since C++17)
(deprecated in C++20)

Returns an rvalue reference or pointer to the current element.

Return value

1) static_cast < reference > ( * current  ) (until C++20) ranges:: iter_move ( current  ) (since C++20)
2) current

Notes

operator - > is deprecated because deferencing its result may yield an lvalue. This may lead to unintended behavior.

Example

Run this code 
#include <iomanip>
#include <iostream>
#include <iterator>
#include <string>
#include <vector>
 
void print(auto rem, const auto& v)
{
    for (std::cout << rem; const auto& e : v)
        std::cout << std::quoted(e) << ' ';
    std::cout << '\n';
}
 
int main()
{
    std::vector<std::string> p{"alpha", "beta", "gamma", "delta"}, q;
    print("1) p: ", p);
    for (std::move_iterator it{p.begin()}, end{p.end()}; it != end; ++it)
    {
        it->push_back('!'); // calls -> string::push_back(char)
        q.emplace_back(*it); // *it <- overload (1)
    }
    print("2) p: ", p);
    print("3) q: ", q);
 
    std::vector v{1, 2, 3};
    std::move_iterator it{v.begin()};
    // *it = 13; // error: using rvalue as lvalue
}

Possible output: 

1) p: "alpha" "beta" "gamma" "delta"
2) p: "" "" "" ""
3) q: "alpha!" "beta!" "gamma!" "delta!"

Defect reports

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

DR Applied to Behavior as published Correct behavior
LWG 2106 C++11 operator * would return a dangling
reference if * current yields a prvalue 		returns the object
in this case

See also

(C++11)
accesses an element by index
(public member function)
Retrieved from " https://en.cppreference.com/mwiki/index.php?title=cpp/iterator/move_iterator/operator*&oldid=177407 "