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]

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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; }; }
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An exception of type bad_weak_ptr is thrown by the shared_ptr constructor taking a weak_ptr.
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const char* what() const noexcept override;
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Returns: An implementation-defined ntbs.