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  1. #include <iostream>
  2. #include <string>
  3.  
  4. class String_counter
  5. {
  6. public:
  7.     String_counter()
  8.     {
  9.         value_ = prefix_ + std::to_string(++counter_);
  10.     }
  11.     ~String_counter()
  12.     {
  13.         value_ = prefix_ + std::to_string(--counter_);
  14.     }
  15.     static const std::string& value() { return value_; }
  16. private:
  17.     static int counter_;
  18.     static const std::string prefix_;
  19.     static std::string value_;
  20. };
  21.  
  22. int String_counter::counter_ = 0;
  23. const std::string String_counter::prefix_ = "s";
  24. std::string String_counter::value_ = prefix_ + std::to_string(counter_);
  25.  
  26. int main()
  27. {
  28.     std::cout << String_counter::value() << std::endl;
  29.     {
  30.         String_counter c1;
  31.         std::cout << String_counter::value() << std::endl;
  32.         {
  33.             String_counter c2;
  34.             std::cout << String_counter::value() << std::endl;
  35.         }
  36.         std::cout << String_counter::value() << std::endl;
  37.     }
  38.     std::cout << String_counter::value() << std::endl;
  39.     return 0;
  40. }
  41.  
Success #stdin #stdout 0s 3432KB
comments (?)
stdin
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Standard input is empty
stdout
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s0
s1
s2
s1
s0
https://ideone.com/HaFkWn
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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