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  1. #include <iostream>
  2.  
  3. struct OpenTag {};
  4. struct HighTag {};
  5. struct LowTag {};
  6. struct CloseTag {};
  7. struct Ema100Tag {};
  8.  
  9. struct Tick {
  10.  
  11.    template <typename Tag> struct Member
  12.    {
  13.       double val;
  14.  
  15.       operator double () const { return val; }
  16.  
  17.       operator double& () { return val; }
  18.    };
  19.  
  20.    struct AllMembers : Member<OpenTag>, 
  21.                        Member<HighTag>,
  22.                        Member<LowTag>,
  23.                        Member<CloseTag>,
  24.                        Member<Ema100Tag> {};
  25.  
  26.    AllMembers data;
  27.  
  28.    template <typename Tag>
  29.       double operator[](Tag t) const
  30.       {
  31.          return (Member<Tag> const&)(data);
  32.       }
  33.  
  34.    template <typename Tag>
  35.       double& operator[](Tag t)
  36.       {
  37.          return (Member<Tag>&)(data);
  38.       }
  39.  
  40. };
  41.  
  42. int main()
  43. {
  44.    Tick t;
  45.    t[OpenTag()] = 12.345;
  46.    std::cout << t[OpenTag()] << std::endl;
  47. }
  48.  
Success #stdin #stdout 0s 3460KB
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Standard input is empty
stdout
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12.345
https://ideone.com/n0ADBy
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
secret

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