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  1. #include <iostream>
  2.  
  3. template <typename T>
  4. struct marker
  5. {
  6.     static const bool init;
  7.  
  8.     marker() { init; }
  9. };
  10.  
  11. template <typename T>
  12. const bool marker<T>::init = ([](){ std::cout << "init done\n"; return true; })();
  13.  
  14. class foo : public marker<foo>
  15. {
  16.  
  17. };
  18.  
  19. int main(int argc, const char * argv[])
  20. {
  21.     foo f;
  22.  
  23.     std::cout << "Hello World\n";
  24.  
  25.     return 0;
  26. }
Success #stdin #stdout 0s 3340KB
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stdin
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Standard input is empty
stdout
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init done
Hello World
https://ideone.com/aerqPY
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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