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  1. #include <vector>
  2. #include <memory>
  3.  
  4. typedef std::vector<int> CBuffer;
  5.  
  6. static CBuffer& PostProcess(CBuffer& data)  { 
  7.     for(auto& el : data)
  8.         el /= 2;
  9.     return data;
  10. }
  11.  
  12. struct CSource
  13. {
  14.     CSource() : _data(std::make_shared<CBuffer>(10)) {}
  15.  
  16.     std::shared_ptr<CBuffer>       GetData()       { return _data; }
  17.     std::shared_ptr<const CBuffer> GetData() const { return _data; }
  18.  
  19.   private:
  20.     std::shared_ptr<CBuffer> _data;
  21. };
  22.  
  23. struct CPlug
  24. {
  25.     CPlug(bool postProcess = true) : m_postProcess(postProcess) { }
  26.  
  27.     std::shared_ptr<const CBuffer> ProcessData() const
  28.     {
  29.         /* get the data from the source, implicitely const */
  30.         auto buffer = m_source.GetData();
  31.  
  32.         if (!m_postProcess)
  33.             return buffer;
  34.  
  35.         // clone!
  36.         auto clone = *buffer;
  37.         return std::make_shared<CBuffer>(PostProcess(clone));
  38.     }
  39.  
  40.   private:
  41.     bool    m_postProcess;
  42.     CSource m_source;
  43. };
  44.  
  45. int main()
  46. {
  47.     CPlug intance;
  48.     auto x = instance.ProcessData();
  49. }
  50.  
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
prog.cpp: In function ‘int main()’:
prog.cpp:48:14: error: ‘instance’ was not declared in this scope
prog.cpp:48:35: error: unable to deduce ‘auto’ from ‘<expression error>’
prog.cpp:48:10: warning: unused variable ‘x’ [-Wunused-variable]
stdout
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Standard output is empty
https://ideone.com/eP8VRX
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
secret

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