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std::make_shared

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< cpp‎ | memory‎ | shared ptr

 
 
Utilità libreria
Tipo di supporto (basic types, RTTI, type traits)
Gestione della memoria dinamica
La gestione degli errori
Programma di utilità
Funzioni variadic
Data e ora
Funzione oggetti
initializer_list(C++11)
bitset
hash(C++11)
Gli operatori relazionali
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Relational operators
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rel_ops::operator!=
rel_ops::operator>
rel_ops::operator<=
rel_ops::operator>=
Coppie e tuple
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Pairs and tuples
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pair
tuple(C++11)
piecewise_construct_t(C++11)
piecewise_construct(C++11)
Swap, in avanti e spostare
Original:
Swap, forward and move
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swap
forward(C++11)
move(C++11)
move_if_noexcept(C++11)
declval(C++11)
 
Gestione della memoria dinamica
Basso livello di gestione della memoria
Allocatori
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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)
Non inizializzata stoccaggio
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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
Puntatori intelligenti
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Smart pointers
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unique_ptr(C++11)
shared_ptr(C++11)
weak_ptr(C++11)
auto_ptr(deprecato)
owner_less(C++11)
enable_shared_from_this(C++11)
bad_weak_ptr(C++11)
default_delete(C++11)
Garbage collection supporto
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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)
Varie
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Miscellaneous
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pointer_traits(C++11)
addressof(C++11)
align(C++11)
C Library
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C Library
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std::shared_ptr
Membri funzioni
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Member functions
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shared_ptr::shared_ptr
shared_ptr::~shared_ptr
shared_ptr::operator=
Modificatori
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Modifiers
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shared_ptr::reset
shared_ptr::swap
Osservatori
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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 membri funzioni
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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... Args >
shared_ptr<T> make_shared( Args... args );
Costruisce un oggetto di tipo T e lo avvolge in un std::shared_ptr utilizzando args della lista dei parametri per il costruttore di 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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Indice

[modifica] Parametri

args -
elenco di argomenti con cui un'istanza di T saranno costruiti .
Original:
list of arguments with which an instance of T will be constructed.
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[modifica] Valore di ritorno

std::shared_ptr di un'istanza di T tipo.
Original:
std::shared_ptr of an instance of type T.
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[modifica] Eccezioni

Può lanciare std::bad_alloc o qualsiasi eccezione generata dal contructor di T.
Original:
May throw std::bad_alloc or any exception thrown by the contructor of T.
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[modifica] Note

Questa funzione alloca la memoria per l'oggetto T e per il blocco di controllo del shared_ptr con una dotazione di memoria singolo. Al contrario, la dichiarazione std::shared_ptr<T> p(new T(Args...)) esegue due allocazioni di memoria, che possono sostenere un inutile sovraccarico.
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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[modifica] Esempio

#include <iostream>
#include <memory>
 
void foo(std::shared_ptr<int> i)
{
    (*i)++;
}
 
int main()
{
    auto sp = std::make_shared<int>(10);
    foo(sp);
    std::cout << *sp << std::endl;
}

Output:

11

[modifica] Vedi anche

constructs new shared_ptr
(membro pubblico funzione) [edit]
crea un puntatore condiviso che gestisce un nuovo oggetto allocato con un allocatore
Original:
creates a shared pointer that manages a new object allocated using an allocator
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(funzione di modello) [edit]