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  1. #include <iostream>
  2.  
  3. class List
  4. {
  5. public:
  6.     constexpr List():
  7.         m_data(nullptr),
  8.         m_next(this),
  9.         m_previous(this)
  10.     {
  11.     }
  12.  
  13.     List(const void *data):
  14.         m_data(data)
  15.     {
  16.         m_next = &root;
  17.         m_previous = root.m_previous;
  18.         root.m_previous = root.m_previous->m_next = this;
  19.     }
  20.  
  21.     template <typename Func>
  22.     static void ForEach(Func f)
  23.     {
  24.         List *ptr = root.m_next;
  25.         while (ptr != &root)
  26.         {
  27.             f(ptr->m_data);
  28.             ptr = ptr->m_next;
  29.         }
  30.     }
  31. private:
  32.     static List root;
  33. private:
  34.     const void *m_data;
  35.     List *m_next;
  36.     List *m_previous;
  37. };
  38.  
  39.  
  40. List a("foo");
  41. List b("bar");
  42. List List::root;
  43.  
  44. int main()
  45. {
  46.     List::ForEach([](const void* ptr)
  47.     {
  48.         std::cout << static_cast<const char*>(ptr) << std::endl;
  49.     });
  50. }
Runtime error #stdin #stdout 0s 3336KB
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Standard input is empty
stdout
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Standard output is empty
https://ideone.com/IIe0Ay
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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