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std::reverse_iterator<Iter>::operator=

From cppreference.com
 
 
Iterator library
Iterator concepts
Iterator primitives
Algorithm concepts and utilities
Indirect callable concepts
Common algorithm requirements
Utilities
(C++20)
Iterator adaptors
Stream iterators
Iterator customization points
Iterator operations
(C++11)
(C++11)
Range access
(C++11)(C++14)
(C++11)(C++14)
(C++17)(C++20)
(C++14)(C++14)
(C++14)(C++14)
(C++17)
(C++17)
 
 
template< class U >
reverse_iterator& operator=( const reverse_iterator<U>& other );
(until C++17)
template< class U >
constexpr reverse_iterator& operator=( const reverse_iterator<U>& other );
(since C++17)

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 std::assignable_from<Iter&, const U&> are modeled.

(since C++20)

Contents

[edit] Parameters

other - iterator adaptor to assign

[edit] Return value

*this

[edit] Example

#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

[edit] 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 3435 C++20 the converting assignment operator was not constrained constrained

[edit] See also

constructs a new iterator adaptor
(public member function) [edit]