std::reverse_iterator<Iter>:: operator=

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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::reverse_iterator
template < class U >
reverse_iterator & operator = ( const reverse_iterator < U > & other ) ;
(constexpr since C++17)

Assigns other. current to current .

This overload participates in overload resolution only if std:: is_same_v < U, Iter > is false and both std:: convertible_to < const U & , Iter > and std:: assignable_from < Iter & , const U & > are modeled.

(since C++20)

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<const short*> it2{nullptr};
    it2 = std::rbegin(a3); // OK
//  it2 = std::begin(a3);  // Compilation error: no viable operator= overload
    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
LWG 280 C++98 heterogeneous assignment was not allowed allowed
LWG 3435 C++20 the converting assignment operator was not constrained constrained

See also

constructs a new iterator adaptor
(public member function)
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