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Showing content from https://cplusplus.com/reference/string/basic_string/crbegin/ below:

public member function

<string>

std::basic_string::crbegin 
const_reverse_iterator crbegin() const noexcept;

Return const_reverse_iterator to reverse beginning

Returns a const_reverse_iterator pointing to the last character of the string (i.e., its reverse beginning).

Parameters none

Return Value A const_reverse_iterator to the reverse beginning of the string.

Member type const_reverse_iterator is a reverse random access iterator type that points to a const character.



Example 
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// string::crbegin/crend
#include <iostream>
#include <string>

int main ()
{
  std::string str ("lorem ipsum");
  for (auto rit=str.crbegin(); rit!=str.crend(); ++rit)
    std::cout << *rit;
  std::cout << '\n';

  return 0;
}

Output:


Complexity Unspecified, but generally constant.

Iterator validity No changes.

Data races The object is accessed.

Exception safetyNo-throw guarantee: this member function never throws exceptions.
The copy construction or assignment of the returned iterator is also guaranteed to never throw.

See also
basic_string::begin
Return iterator to beginning (public member function)
basic_string::crend
Return const_reverse_iterator to reverse end (public member function)
basic_string::rbegin
Return reverse iterator to reverse beginning (public member function)

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