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std::weak_ptr::weak_ptr

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std::weak_ptr
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weak_ptr::weak_ptr
weak_ptr::~weak_ptr
weak_ptr::operator=
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weak_ptr::reset
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constexpr weak_ptr();
 (1) (desde C++11)
weak_ptr( const weak_ptr& r );
 (2) (desde C++11)
template< class Y >
weak_ptr( const weak_ptr<Y>& r );
 (2) (desde C++11)
template< class Y >
weak_ptr( const std::shared_ptr<Y>& r );
 (2) (desde C++11)
Constrói weak_ptr novo que potencialmente partes de um objeto com r.
Original:
Constructs new weak_ptr that potentially shares an object with r.
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1)
Construtor padrão. Constrói weak_ptr vazio.
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Default constructor. Constructs empty weak_ptr.
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2)
Constrói weak_ptr nova, que compartilha um objeto gerenciado pelo r. Se r gere nenhum objeto, *this gere nenhum objeto também. As sobrecargas templated não participar na resolução de sobrecarga, a menos Y* é implicitamente conversível para T*.
Original:
Constructs new weak_ptr which shares an object managed by r. If r manages no object, *this manages no object too. The templated overloads don't participate in the overload resolution unless Y* is implicitly convertible to T*.
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Índice

[editar] Parâmetros

r -
um std::shared_ptr ou std::weak_ptr que será visto por este std::weak_ptr
Original:
a std::shared_ptr or std::weak_ptr that will be viewed by this std::weak_ptr
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[editar] Exceções

noexcept specification:  
noexcept
  (desde C++11)

[editar] Exemplo

#include <memory>
#include <iostream>
 
struct Foo {};
 
int main()
{
   std::weak_ptr<Foo> w_ptr;
 
   {
      auto ptr = std::make_shared<Foo>();
      w_ptr = ptr;
      std::cout << "w_ptr.use_count() inside scope: " << w_ptr.use_count() << '\n';
   }
 
   std::cout << "w_ptr.use_count() out of scope: " << w_ptr.use_count() << '\n';
}

Saída: 

w_ptr.use_count() inside scope: 1
w_ptr.use_count() out of scope: 0

[editar] Veja também
atribui o weak_ptr
Original:
assigns the weak_ptr
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(função pública membro) [edit]
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