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std::allocate_shared

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< cpp‎ | memory‎ | shared ptr

 
 
 
Dynamische Speicherverwaltung
Low-Level-Speicherverwaltung
Zuweiser
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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)
Initialisierter Speicher
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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
Intelligente Zeiger
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Smart pointers
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unique_ptr(C++11)
shared_ptr(C++11)
weak_ptr(C++11)
auto_ptr(veraltet)
owner_less(C++11)
enable_shared_from_this(C++11)
bad_weak_ptr(C++11)
default_delete(C++11)
Garbage Collection Unterstützung
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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)
Verschiedenes
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Miscellaneous
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pointer_traits(C++11)
addressof(C++11)
align(C++11)
C-Bibliothek
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C Library
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std::shared_ptr
Member-Funktionen
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Member functions
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shared_ptr::shared_ptr
shared_ptr::~shared_ptr
shared_ptr::operator=
Modifiers
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Modifiers
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shared_ptr::reset
shared_ptr::swap
Beobachter
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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
Non-Member-Funktionen
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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 );
Erzeugt ein Objekt vom Typ T und wickelt es in einem std::shared_ptr mit args als Parameter-Liste für den Konstruktor T .
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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Alle Speicherzuweisung erfolgt über eine Kopie des alloc, die die Allocator Anforderungen erfüllt .
Original:
All memory allocation is done using a copy of alloc, which satisfies the Allocator requirements.
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Inhaltsverzeichnis

[Bearbeiten] Parameter

alloc - The Allocator to use.
args... -
Liste der Argumente, mit denen eine Instanz T gebaut werden soll .
Original:
list of arguments with which an instance of T will be constructed.
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[Bearbeiten] Rückgabewert

std::shared_ptr einer Instanz des Typs T .
Original:
std::shared_ptr of an instance of type T.
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[Bearbeiten] Ausnahmen

Kann die Ausnahmen von Alloc::allocate() oder aus dem Konstruktor T geworfen werfen .
Original:
Can throw the exceptions thrown from Alloc::allocate() or from the constructor of T.
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[Bearbeiten] Notes

Diese Funktion Speicher für die T-Objekt und für die shared_ptr der Kontrolle Block mit einem einzigen Speicherzuweisung. Im Gegensatz dazu führt die Erklärung std::shared_ptr<T> p(new T(Args...)) zwei Speicherzuordnungen, die unnötigen Overhead entstehen können .
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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Eine Kopie alloc wird als Teil des Steuerblocks gespeichert, so dass es verwendet werden, um es einmal deallocate gemeinsamen und schwacher Referenzzählung Null erreicht werden .
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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[Bearbeiten] Siehe auch

erzeugt einen neuen shared_ptr
(öffentliche Elementfunktion) [edit]
erzeugt einen shared_ptr, der ein neues Objekt verwaltet
(Funktions-Template) [edit]