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  1. #include <iostream>
  2.  
  3. template <class T>
  4. class Logger
  5. {
  6.   T value;
  7.  
  8. public:
  9.  
  10.   T& operator=(const T& other)
  11.   {
  12.     std::cout << "Setting new value\n";
  13.     value = other;
  14.     return value;
  15.   }
  16.  
  17.   operator T() const
  18.   {
  19.     return value;
  20.   }
  21.  
  22. };
  23.  
  24. class Foo
  25. {
  26. public:
  27.     Foo() {}
  28.  
  29.     void SetBar(int value)
  30.     {
  31.         //Log that m_bar is going to be changed
  32.         m_bar = value;
  33.     }
  34.  
  35. private:
  36.  
  37. #if 1
  38.     Logger<int> m_bar; // the variable we want to track
  39. #else
  40.     int m_bar; // the variable we want to track
  41. #endif
  42.  
  43. };
  44.  
  45. int main()
  46. {
  47.   auto f = Foo();
  48.   f.SetBar(12);
  49. }
Success #stdin #stdout 0s 3456KB
comments (?)
stdin 
Standard input is empty
stdout 
Setting new value
https://ideone.com/oBBB8N
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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