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  1. #include <iostream>
  2. #include <atomic>
  3.  
  4. #define Q_DECL_NOTHROW noexcept
  5. #define QT_BASIC_ATOMIC_HAS_CONSTRUCTORS
  6.  
  7. template <typename T> struct QAtomicOps
  8. {
  9.     typedef std::atomic<T> Type;
  10. };
  11.  
  12. template <typename T>
  13. class QBasicAtomicInteger
  14. {
  15. public:
  16.     typedef QAtomicOps<T> Ops;
  17.     typename Ops::Type _q_value;
  18.  
  19. #ifdef QT_BASIC_ATOMIC_HAS_CONSTRUCTORS
  20.     QBasicAtomicInteger() = default;
  21.     constexpr QBasicAtomicInteger(T value) Q_DECL_NOTHROW : _q_value(value) {}
  22.     QBasicAtomicInteger(const QBasicAtomicInteger &) = delete;
  23.     QBasicAtomicInteger &operator=(const QBasicAtomicInteger &) = delete;
  24.     QBasicAtomicInteger &operator=(const QBasicAtomicInteger &) volatile = delete;
  25. #endif
  26. };
  27. typedef QBasicAtomicInteger<int> QBasicAtomicInt;
  28.  
  29. #ifndef Q_BASIC_ATOMIC_INITIALIZER
  30. #  define Q_BASIC_ATOMIC_INITIALIZER(a) { (a) }
  31. #endif 
  32.  
  33. struct QMetaTypeIdQObject
  34. {
  35.     enum {
  36.         Defined = 1
  37.     };
  38.  
  39.     static int qt_metatype_id()
  40.     {
  41.         static QBasicAtomicInt metatype_id = Q_BASIC_ATOMIC_INITIALIZER(0);
  42.         return metatype_id._q_value;
  43.     }
  44. }; 
  45.  
  46. int main()
  47. {
  48.     std::cout << QMetaTypeIdQObject::qt_metatype_id() << std::endl;
  49.  
  50.     return 0;
  51. }
  52.  
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https://ideone.com/MuuYmS
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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