1. C++ / Говнокод #25520

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    #include <iostream>
#include <functional>
#include <array>
#include <iterator>

template <class T>
class Filter : public std::iterator<
                 std::input_iterator_tag,
                 typename std::iterator_traits<T>::value_type,
                 typename std::iterator_traits<T>::difference_type,
                 typename std::iterator_traits<T>::pointer,
                 typename std::iterator_traits<T>::reference
               >
{
private:
  typedef typename std::iterator_traits<T>::value_type value_type;
  std::function<bool(value_type)> m_predicate;
  T m_begin, m_end;
  value_type m_current;

public:
  Filter(T t_begin, T t_end, std::function<bool(value_type)> t_predicate)
    : m_begin(t_begin), m_end(t_end), m_predicate(t_predicate)
  {
  }
  
  Filter<T>& begin()
  {
    return ++*this;
  }
  
  Filter<T>& end()
  {
    return *this;
  }
  
  value_type operator* ()
  {
    return m_current;
  }
  
  Filter<T>& operator++ ()
  {
    do {
      m_current = *m_begin;
      ++m_begin;
    } while (m_begin != m_end && !m_predicate(m_current));
    return *this;
  }
  
  
  bool operator!= (Filter<T>& t_right)
  {
    return m_begin != t_right.m_end;
  }
};


int main()
{
  std::array<int, 10> arr{ {4, 35, 0, 23, 0, 0, 5} };
  for (auto i : Filter<typename std::array<int,10>::iterator>(arr.begin(), arr.end(), [](int x){return x != 0;})) {
    std::cout << i << " ";
  }
}

    Запостил: Lemming, 07 Апреля 2019

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