std::bad_weak_ptr - cppreference.com
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      std::bad_weak_ptr

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      std::bad_weak_ptr
      Funções de membro
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      Member functions
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      bad_weak_ptr::bad_weak_ptr
       
      <tbody> </tbody>
      Definido no cabeçalho <memory>
      class bad_weak_ptr;
      		 (desde C++11)
      std::bad_weak_ptr é o tipo do objeto lançado como exceções pelos construtores de std::shared_ptr que levam std::weak_ptr como argumento, quando o std::weak_ptr refere-se a um objeto já eliminado.
      Original:
      std::bad_weak_ptr is the type of the object thrown as exceptions by the constructors of std::shared_ptr that take std::weak_ptr as the argument, when the std::weak_ptr refers to an already deleted object.
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      cpp/error/exception

      Inheritance diagram

      Funções de membro
      constrói o objeto bad_weak_ptr
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      constructs the bad_weak_ptr object
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      (função pública membro)

      Herdado de std::exception

      Member functions

      [virtual]
      destrói o objeto de exceção
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      destructs the exception object
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      (of std::exception função pública virtual membro) [edit]
      [virtual]
      retorna uma cadeia explicativa
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      returns an explanatory string
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      (of std::exception função pública virtual membro) [edit]

      Exemplo

      #include <memory>
#include <iostream>
int main()
{
    std::shared_ptr<int> p1(new int(42));
    std::weak_ptr<int> wp(p1);
    p1.reset();
    try {
        std::shared_ptr<int> p2(wp);
    } catch(const std::bad_weak_ptr& e) {
        std::cout << e.what() << '\n';
    }
}

      Saída: 

      std::bad_weak_ptr

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