20 Memory management library [mem]

20.3 Smart pointers [smartptr]

20.3.2 Shared-ownership pointers [util.sharedptr]

20.3.2.1 Class bad_weak_ptr [util.smartptr.weak.bad]

namespace std { class bad_weak_ptr : public exception { public: // see [exception] for the specification of the special member functions const char* what() const noexcept override; }; }
An exception of type bad_weak_ptr is thrown by the shared_ptr constructor taking a weak_ptr.
const char* what() const noexcept override;
Returns: An implementation-defined ntbs.