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std::allocate_shared

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< cpp‎ | memory‎ | shared 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>=
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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
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raw_storage_iterator
get_temporary_buffer
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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)
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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::shared_ptr
メンバ関数
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Member functions
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shared_ptr::shared_ptr
shared_ptr::~shared_ptr
shared_ptr::operator=
修飾子
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Modifiers
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shared_ptr::reset
shared_ptr::swap
オブザーバー
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Observers
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shared_ptr::get
shared_ptr::operator*
shared_ptr::operator->
shared_ptr::use_count
shared_ptr::unique
shared_ptr::operator bool
shared_ptr::owner_before
非メンバ関数
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Non-member functions
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std::swap
make_shared
allocate_shared
static_pointer_cast
dynamic_pointer_cast
const_pointer_cast
get_deleter
operator==
operator|=
operator<
operator<=
operator>
operator>=
operator<<
atomic_is_lock_free
atomic_load
atomic_load_explicit
atomic_store
atomic_store_explicit
atomic_exchange
atomic_exchange_explicit
atomic_compare_exchange_weak
atomic_compare_exchange_strong
atomic_compare_exchange_weak_explicit
atomic_compare_exchange_strong_explicit
std::hash
 
Defined in header <memory>
template< class T, class Alloc, class... Args >
shared_ptr<T> allocate_shared( const Alloc& alloc, Args... args );
タイプTのオブジェクトを構築し、std::shared_ptrのコンストラクタのパラメータリストとしてargsを使用Tにラップ.
Original:
Constructs an object of type T and wraps it in a std::shared_ptr using args as the parameter list for the constructor of T.
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すべてのメモリ割り当てはalloc要件を満たすAllocatorのコピーを使用して行われます.
Original:
All memory allocation is done using a copy of alloc, which satisfies the Allocator requirements.
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目次

[編集] パラメータ

alloc - The Allocator to use.
args... -
Tのインスタンスが構築されると引数のリスト.
Original:
list of arguments with which an instance of T will be constructed.
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[編集] 値を返します

std::shared_ptrタイプTのインスタンスの.
Original:
std::shared_ptr of an instance of type T.
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[編集] 例外

Alloc::allocate()から、またはTのコンストラクタからスローされた例外をスローすることができます.
Original:
Can throw the exceptions thrown from Alloc::allocate() or from the constructor of T.
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[編集] ノート

この関数は、単一のメモリ割り当てとTオブジェクト用とshared_ptrの制御ブロックにメモリを割り当てます。これとは対照的に、宣言std::shared_ptr<T> p(new T(Args...))不要なオーバーヘッドを被るかもしれない2つのメモリの割り当てを行う.
Original:
This function allocates memory for the T object and for the shared_ptr's control block with a single memory allocation. In contrast, the declaration std::shared_ptr<T> p(new T(Args...)) performs two memory allocations, which may incur unnecessary overhead.
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共有と弱い両方の参照カウントがゼロに達すると、それがそれを解放するために使用することができるようにallocのコピーは、制御ブロックの一部として保存されます.
Original:
A copy of alloc is stored as part of the control block so that it can be used to deallocate it once both shared and weak reference counts reach zero.
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[編集] も参照してください

constructs new shared_ptr
(パブリックメンバ関数) [edit]
新しいオブジェクトを管理し共有ポインタを作成します
Original:
creates a shared pointer that manages a new object
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(関数テンプレート) [edit]