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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