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std::weak_ptr::weak_ptr

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< cpp‎ | memory‎ | weak ptr

 
 
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関数オブジェクト
initializer_list(C++11)
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Pairs and tuples
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pair
tuple(C++11)
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フォワード、スワップ、および移動
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Swap, forward and move
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swap
forward(C++11)
move(C++11)
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動的なメモリ管理
低レベルのメモリ管理
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Allocators
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Uninitialized storage
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Smart pointers
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std::weak_ptr
メンバ関数
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Member functions
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weak_ptr::weak_ptr
weak_ptr::~weak_ptr
weak_ptr::operator=
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Modifiers
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weak_ptr::reset
weak_ptr::swap
オブザーバー
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Observers
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weak_ptr::use_count
weak_ptr::expired
weak_ptr::lock
weak_ptr::owner_before
非メンバ関数
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Non-member functions
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std::swap
 
constexpr weak_ptr();
(1) (C + + 11以来)
weak_ptr( const weak_ptr& r );
(2) (C + + 11以来)
template< class Y >
weak_ptr( const weak_ptr<Y>& r );
(2) (C + + 11以来)
template< class Y >
weak_ptr( const std::shared_ptr<Y>& r );
(2) (C + + 11以来)
潜在weak_ptr持つオブジェクトを共有する新しいrを構築し.
Original:
Constructs new weak_ptr that potentially shares an object with r.
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1)
デフォルトのコンストラクタです。空のweak_ptrを構築し.
Original:
Default constructor. Constructs empty weak_ptr.
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2)
weak_ptrによって管理されているオブジェクトを共有する新しいrを構築します。 rに糸目を管理しない場合には、*thisもないオブジェクトを管理していません。 Y*T*に暗黙的に変換しない限り、テンプレート化されたオーバーロードには、オーバーロードの解決に参加しません.
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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目次

[編集] パラメータ

r -
このstd::shared_ptrが見るであろうstd::weak_ptrまたは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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[編集] 例外

noexcept specification:  
noexcept
  (C + + 11以来)

[編集]

#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';
}

Output:

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

[編集] も参照してください

weak_ptrを割り当てます
Original:
assigns the weak_ptr
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(パブリックメンバ関数) [edit]