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  1. #include <stdio.h>
  2.  
  3. struct modelCatalog {
  4.     int m_a;
  5.     modelCatalog(): m_a(777) {}
  6. };
  7.  
  8. class G4PhysicsModelCatalog
  9. {
  10.   public:
  11.   G4PhysicsModelCatalog();
  12.   static modelCatalog* catalog;
  13. };
  14.  
  15. G4PhysicsModelCatalog::G4PhysicsModelCatalog()
  16. { if(!catalog) { 
  17.     static modelCatalog catal;
  18.     catalog = &catal; 
  19.   } 
  20. }
  21.  
  22. modelCatalog* G4PhysicsModelCatalog::catalog;
  23. /*
  24. G4int G4PhysicsModelCatalog::Register(const G4String& name)
  25. {
  26.   G4PhysicsModelCatalog();
  27.   .... 
  28. }
  29. */
  30. int main()
  31. {
  32.     printf("catalog before = %p\n", G4PhysicsModelCatalog::catalog);
  33.     G4PhysicsModelCatalog();
  34.     printf("catalog after= %p m_a = %d\n", G4PhysicsModelCatalog::catalog,  G4PhysicsModelCatalog::catalog->m_a);
  35.     return 0; 
  36. }
Success #stdin #stdout 0s 15240KB
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stdin
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Standard input is empty
stdout
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catalog before = (nil)
catalog after= 0x2b47368cb058 m_a = 777
https://ideone.com/rzRN7j
language:
C++ (gcc 8.3)
created:
7 years ago
visibility:
public

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