Exception safety is hardly a "default behavior" of C++, considering such gems[1] as: // This is unsafe. sink( unique_ptr<widget>{new widget{}},

Exception safety is hardly a "default behavior" of C++, considering such gems[1] as: // This is unsafe. sink( unique_ptr<widget>{new widget{}}, unique_ptr<gadget>{new gadget{}} ); // This is safe. sink( make_unique<widget>(), make_unique<gadget>() ); [1] https://herbsutter.com/2013/05/29/gotw-89-solution-smart-pointers/ https://herbsutter.com/2013/05/29/gotw-89-solution-smart-poi...