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  1. #include <unordered_map>
  2. #include <memory>
  3. #include <iostream>
  4.  
  5. class Data {
  6.     public:
  7.         virtual ~Data(){}
  8.         virtual int Size() = 0;
  9. };
  10.  
  11. class Struct : public Data {
  12.             std::unordered_map<std::string, std::unique_ptr<Data>> m;
  13.     public: 
  14.         Struct & Add(const std::string& name, std::unique_ptr<Data> x) {
  15.             m[name] = std::move(x);
  16.             return *this;
  17.         }
  18.         void Print() {
  19.             for(const auto& tmp : m )
  20.                 std::cout << tmp.first << "    " << tmp.second->Size() << "\n";
  21.         }
  22.         int Size() override {
  23.             int sum = 0;
  24.             for (const auto& tmp : m)
  25.                 sum += tmp.second->Size();
  26.             return sum;
  27.         }
  28. };
  29.  
  30. class IntData : public Data {
  31.     public:
  32.         int Size( ) override { return 4; }
  33. };
  34.  
  35. class DoubleData : public Data {
  36.     public:
  37.         DoubleData( ) { }
  38.         int Size( ) override { return 8; }
  39. };
  40.  
  41. int main() {
  42.     Struct  a;
  43.     a.Add("Integer", std::make_unique<IntData>() );
  44.     a.Print();
  45. }
  46.  
Success #stdin #stdout 0s 3460KB
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stdin
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Standard input is empty
stdout
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Integer    4
https://ideone.com/7OzmpZ
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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