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  1. #include <iostream>
  2. #include <iterator>
  3.  
  4. struct csforward_iterator : 
  5.     std::iterator<std::bidirectional_iterator_tag, const char, void> {
  6.  
  7.     csforward_iterator( pointer ptr = nullptr ) : p( ptr ) {}
  8.  
  9.     csforward_iterator& operator++()  { ++p; return *this; }
  10.     csforward_iterator operator++(int) { auto t = *this; ++p; return t; }
  11.  
  12.     csforward_iterator& operator--()  { --p; return *this; }
  13.     csforward_iterator operator--(int) { auto t = *this; --p; return t; }
  14.  
  15.     bool operator==( csforward_iterator o ) { 
  16.         return p == o.p or ( p ? not ( o.p or *p ) : *o.p ); 
  17.     }
  18.     bool operator!=( csforward_iterator o ) { return not operator==( o ); }
  19.  
  20.     reference operator*() const { return *p; }
  21. private:
  22.     pointer p;
  23. };
  24.  
  25.  
  26. int main() {
  27.     std::copy( csforward_iterator( "foobar" ), csforward_iterator(), std::ostream_iterator<char>(std::cout) );
  28.     std::cout << std::endl;
  29. }
Success #stdin #stdout 0s 4396KB
comments ()
stdin 
Standard input is empty
stdout 
foobar
https://ideone.com/KJK9Pl
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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