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#include <cstdlib>
 
void throwing_func() noexcept(false);
 
void f() { // never invoked by program except as exit handler
  throwing_func();
}
 
int main() {
  if (0 != std::atexit(f)) {
    // Handle error
  }
  // ...
}

#include <cstdlib>

void throwing_func() noexcept(false);

void f() { // never invoked by program except as exit handler
  try {
    throwing_func();
  } catch (...) {
    // Handle error
  }
}

int main() {
  if (0 != std::atexit(f)) {
    // Handle error
  }
  // ...
}