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  1. #include <iostream>
  2. #include <mutex>
  3.  
  4. using namespace std;
  5.  
  6. std::once_flag flag;
  7.  
  8. class Class
  9. {
  10. public:
  11.     Class()
  12.     {
  13.         std::call_once(flag, [this]{ SomeMethod(); });
  14.     }
  15.  
  16.     void SomeMethod()
  17.     {
  18.         cout << __func__ << endl;
  19.     }
  20. };
  21.  
  22.  
  23. int main(int argc, const char * argv[])
  24. {
  25.     Class x, y;
  26.     x.SomeMethod();
  27.     y.SomeMethod();
  28. }
  29.  
  30.  
  31.  
Success #stdin #stdout 0s 3456KB
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stdin
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Standard input is empty
stdout
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SomeMethod
SomeMethod
SomeMethod
https://ideone.com/hPeUbN
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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