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  1. struct Node;
  2. using ValueType = int;
  3.  
  4. union d_type
  5. {
  6.     struct
  7.     {
  8.         Node *_lhs, *_rhs;
  9.     } _ptrpair;
  10.     ValueType _val;
  11.  
  12.     d_type() noexcept = default;
  13.     d_type(const d_type&) noexcept = default;
  14.     d_type(d_type&&) noexcept = default;
  15.     d_type& operator=(const d_type&) noexcept = default;
  16.     d_type& operator=(d_type&&) noexcept = default;
  17.     ~d_type() noexcept = default;
  18.  
  19.     d_type(const ValueType& v) noexcept
  20.     {
  21.         _val = v;
  22.     }
  23.     d_type(Node* lhs, Node* rhs) noexcept
  24.     {
  25.         _ptrpair = { lhs, rhs };
  26.     }
  27. };
  28.  
  29. d_type a{ nullptr, nullptr };
  30. d_type b{ 0 };
  31. int main(){}
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https://ideone.com/exotTh
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
secret

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