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std::weak_ptr::lock

提供: cppreference.com
< cpp‎ | memory‎ | weak ptr

 
 
ユーティリティライブラリ
支援を入力します (basic types, RTTI, type traits)
動的なメモリ管理
エラー処理
プログラムユーティリティ
可変個引数関数
日付と時刻
関数オブジェクト
initializer_list(C++11)
bitset
hash(C++11)
関係演算子
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Relational operators
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rel_ops::operator!=
rel_ops::operator>
rel_ops::operator<=
rel_ops::operator>=
ペアとタプル
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Pairs and tuples
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pair
tuple(C++11)
piecewise_construct_t(C++11)
piecewise_construct(C++11)
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)
move_if_noexcept(C++11)
declval(C++11)
 
動的なメモリ管理
低レベルのメモリ管理
アロケータ
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Allocators
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allocator
allocator_traits(C++11)
allocator_arg_t(C++11)
allocator_arg(C++11)
uses_allocator(C++11)
scoped_allocator_adaptor(C++11)
ストレージを初期化されていない
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Uninitialized storage
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uninitialized_copy
uninitialized_copy_n(C++11)
uninitialized_fill
uninitialized_fill_n
raw_storage_iterator
get_temporary_buffer
return_temporary_buffer
スマートポインタ
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Smart pointers
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unique_ptr(C++11)
shared_ptr(C++11)
weak_ptr(C++11)
auto_ptr(廃止予定)
owner_less(C++11)
enable_shared_from_this(C++11)
bad_weak_ptr(C++11)
default_delete(C++11)
ガベージコレクションをサポートしています
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Garbage collection support
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declare_reachable(C++11)
undeclare_reachable(C++11)
declare_no_pointers(C++11)
undeclare_no_pointers(C++11)
pointer_safety(C++11)
get_pointer_safety(C++11)
その他
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Miscellaneous
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pointer_traits(C++11)
addressof(C++11)
align(C++11)
Cライブラリ
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C Library
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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=
修飾子
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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
 
std::shared_ptr<T> lock() const
(C + + 11以来)
管理対象オブジェクトの所有権を共有していることを新しいshared_ptrを作成します。ない管理対象オブジェクトが存在しない場合、すなわち*this空の場合は、返さshared_ptrも空です..
Original:
Creates a new shared_ptr that shares ownership of the managed object. If there is no managed object, i.e. *this is empty, then the returned shared_ptr also is empty.
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効果的にexpired() ? shared_ptr<T>() : shared_ptr<T>(*this)返し.
Original:
Effectively returns expired() ? shared_ptr<T>() : shared_ptr<T>(*this).
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目次

[編集] パラメータ

(なし)
Original:
(none)
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[編集] 値を返します

所有されているオブジェクトの所有権を共有shared_ptr.
Original:
A shared_ptr which shares ownership of the owned object.
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[編集] 例外

noexcept specification:  
noexcept
  (C + + 11以来)

[編集] ノート

この関数とshared_ptrのコンストラクタの両方が、管理対象オブジェクトの一時的な所有権を取得するために使用することができる。違いがstd::shared_ptr<T>が空std::weak_ptrを構築しながらstd::weak_ptr<T>::lock()のコンストラクタは、std::shared_ptr<T>引数が空の例外をスローすることです.
Original:
Both this function and the constructor of shared_ptr may be used to acquire temporary ownership of the managed object. The difference is that the constructor of std::shared_ptr<T> throws an exception when the std::weak_ptr argument is empty, while std::weak_ptr<T>::lock() constructs an empty std::shared_ptr<T>.
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[編集]

[編集] も参照してください

参照されるオブジェクトが既に削除されたかどうかをチェックします
Original:
checks whether the referenced object was already deleted
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(パブリックメンバ関数) [edit]