std::reverse_iterator::operator=(3)

NAME
std::reverse_iterator::operator= - std::reverse_iterator::operator=

Synopsis
   template< class U > (until C++17)
   reverse_iterator& operator=( const reverse_iterator<U>& other );
   template< class U >
   constexpr reverse_iterator& operator=( const reverse_iterator<U>& (since C++17)
   other );
   The underlying iterator is assigned the value of the underlying iterator of other,
   i.e. other.base().
   This overload participates in overload resolution only if U is not the
   same type as Iter and std::convertible_to<const U&, Iter> and (since C++20)
   std::assignable_from<Iter&, const U&> are modeled.

Parameters
   other - iterator adaptor to assign

Return value
   *this

Example
// Run this code
 #include <iostream>
 #include <iterator>
 int main()
 {
     const int a1[]{0, 1, 2};
     int a2[]{0, 1, 2, 3};
     short a3[]{40, 41, 42};
     std::reverse_iterator<const int*> it1{std::crbegin(a1)};
     it1 = std::reverse_iterator<int*>{std::rbegin(a2)}; // OK
 // it1 = std::reverse_iterator<short*>{std::rbegin(a3)}; // compilation error:
                        // incompatible pointer types
     std::reverse_iterator<short const*> it2{nullptr};
     it2 = std::rbegin(a3); // OK
 // it2 = std::begin(a3); // compilation error: no viable overloaded '='
     std::cout << *it2 << '\n';
 }

Output:
 42
   Defect reports
   The following behavior-changing defect reports were applied retroactively to
   previously published C++ standards.
      DR Applied to Behavior as published Correct behavior
                       a std::reverse_iterator could be constructed,
   LWG 280 C++98 but not assigned, from also allowed
                       another std::reverse_iterator with a different assignment
                       underlying iterator type
   LWG 3435 C++20 the converting assignment operator was not constrained
                       constrained

See also
   constructor constructs a new iterator adaptor
                 (public member function)