use_atomic.h

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#ifndef CLHEP_USE_ATOMIC_GUARD_H
#define CLHEP_USE_ATOMIC_GUARD_H
 
// ======================================================================
//
// Use std::atomic when the compiler declares it uses the C++11 standard
//
// on macOS, atomic is available starting with Sierra (Darwin 16)
// ======================================================================
 
#if _WIN32
    #include <atomic>
    #define CLHEP_USE_ATOMIC
#else
  #if __cplusplus >= 201103L
 
  #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ > 7) || __clang__ 
    #include <atomic>
    #define CLHEP_USE_ATOMIC
  #endif
 
  #endif
#endif
 
#endif