Namespace
Varianti

std::unique_ptr::unique_ptr

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< cpp‎ | memory‎ | unique 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
Original:
Relational operators
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rel_ops::operator!=
rel_ops::operator>
rel_ops::operator<=
rel_ops::operator>=
Coppie e tuple
Original:
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
Original:
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
Original:
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
Original:
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
Original:
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
Original:
Miscellaneous
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pointer_traits(C++11)
addressof(C++11)
align(C++11)
C Library
Original:
C Library
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std :: unique_ptr
Membri funzioni
Original:
Member functions
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unique_ptr::unique_ptr
unique_ptr::~unique_ptr
unique_ptr::operator=
Modificatori
Original:
Modifiers
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unique_ptr::release
unique_ptr::reset
unique_ptr::swap
Osservatori
Original:
Observers
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unique_ptr::get
unique_ptr::get_deleter
unique_ptr::operator bool
unique_ptr::operator*
unique_ptr::operator->
unique_ptr::operator[]
Non membri funzioni
Original:
Non-member functions
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operator==
operator!=
operator<
operator>
operator<=
operator>
operator>=
std::swap
std::hash
 
constexpr unique_ptr();
(1) (dal C++11)
explicit unique_ptr( pointer p );
(2) (dal C++11)
unique_ptr( pointer p, d1 );
(3) (dal C++11)
unique_ptr( pointer p, d2 );
(4) (dal C++11)
unique_ptr( unique_ptr&& u );
(5) (dal C++11)
constexpr unique_ptr( nullptr_t );
(6) (dal C++11)
template< class U, class E >
unique_ptr( unique_ptr<U, E>&& u );
(7) (dal C++11)
template< class U >
unique_ptr( auto_ptr<U>&& u );
(8) (dal C++11)
1)
Costruisce un std::unique_ptr vuoto.
Original:
Constructs an empty std::unique_ptr.
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2)
Costruisce un std::unique_ptr che possiede p, l'inizializzazione del puntatore memorizzato con p e valore-inizializzazione del memorizzato deleter.
Original:
Constructs a std::unique_ptr which owns p, initializing the stored pointer with p and value-initializing the stored deleter.
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3-4)
Costruisce un oggetto che possiede std::unique_ptr p, l'inizializzazione del puntatore memorizzato con p e l'inizializzazione di un D deleter come di seguito (dipende dal fatto che D è un tipo di riferimento)
Original:
Constructs a std::unique_ptr object which owns p, initializing the stored pointer with p and initializing a deleter D as below (depends upon whether D is a reference type)
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a)
Se D non è riferimento A tipo, quindi le firme sono:
Original:
If D is non-reference type A, then the signatures are:
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unique_ptr(pointer p, const A& d);
unique_ptr(pointer p, A&& d);
b)
Se D è un lvalue riferimento A& tipo, quindi le firme sono:
Original:
If D is an lvalue-reference type A&, then the signatures are:
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unique_ptr(pointer p, A& d);
unique_ptr(pointer p, A&& d);
c)
Se D è un lvalue riferimento const A& tipo, quindi le firme sono:
Original:
If D is an lvalue-reference type const A&, then the signatures are:
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unique_ptr(pointer p, const A& d);
unique_ptr(pointer p, const A&& d);
5)
Costruisce un unique_ptr trasferendo la proprietà da u a *this.
Original:
Constructs a unique_ptr by transferring ownership from u to *this.
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6)
Costruisce un std::unique_ptr vuoto.
Original:
Constructs an empty std::unique_ptr.
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7)
Costruisce un unique_ptr trasferendo la proprietà da u a *this, dove è costruito con un u specificato deleter (E). Dipende dal fatto E è un tipo di riferimento, come segue:
Original:
Constructs a unique_ptr by transferring ownership from u to *this, where u is constructed with a specified deleter (E). It depends upon whether E is a reference type, as following:
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a)
E se è un tipo di riferimento, questo deleter è copia costruito da deleter u di.
Original:
if E is a reference type, this deleter is copy constructed from u's deleter.
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b)
E se non è un tipo di riferimento, questo deleter è mossa costruito da deleter u di.
Original:
if E is a non-reference type, this deleter is move constructed from u's deleter.
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8)
Costruisce un unique_ptr in cui viene inizializzato il puntatore memorizzato con u.release() e la stored deleter è valore inizializzato.
Original:
Constructs a unique_ptr where the stored pointer is initialized with u.release() and the stored deleter is value-initialized.
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[modifica] Parametri

p -
un puntatore ad un oggetto da gestire
Original:
a pointer to an object to manage
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d1,d2 -
deleter una da utilizzare per distruggere l'oggetto
Original:
a deleter to use to destroy the object
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u -
un altro puntatore intelligente per acquistare la proprietà di
Original:
another smart pointer to acquire the ownership from
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[modifica] Eccezioni

noexcept specification:  
noexcept
  (dal C++11)

[modifica] Esempio

#include <iostream>
#include <memory>
 
struct Foo {
    Foo() { std::cout << "Foo...\n"; }
    ~Foo() { std::cout << "~Foo...\n\n"; }
};
 
struct D{
 
    D(){};
 
    D(const D& other){
        std::cout << "call D const copy constructor... \n";
    }
 
    D(D& other){
        std::cout << "call D copy constructor... \n";
    }
 
    D(D&& other){
        std::cout << "call D move constructor... \n";
    }
 
    void operator () (Foo* p) const {
        std::cout << "Call delete for Foo object...\n";
        delete p;
    };
};
 
int main()
{
    //constructor (1)
    std::cout << "Example constructor(1)...\n\n";
    std::unique_ptr<Foo> up;
 
    //constructor (2)
    std::cout << "Example constructor(2)...\n";
    Foo* f = new Foo();
    std::unique_ptr<Foo> up2(f); //up2 now owns f
    up2.reset();
 
    //constructor (3&4)
    std::cout << "Example constructor(3&4)...\n";
 
    //D is not an lvalue-reference - d is a non-const rvalue
    std::unique_ptr<Foo, D> up3(new Foo(), D()); //D must be MoveConstructible
    up3.reset();
 
    //D is not an lvalue-refernce - d is a left value
    D d2;
    std::unique_ptr<Foo, D> up4(new Foo(), d2); //D must be Copyconstructible
    up4.reset();
 
    //D is a left value reference type
    D d3;
    std::unique_ptr<Foo, D&> up5(new Foo(), d3); //up3 holds a reference to d3
    up5.reset();
 
    //D is a const left value reference type
    const D d4;
    std::unique_ptr<Foo, const D&> up6(new Foo(), d4);
    up6.reset();
 
    //constructor (5)
    std::cout << "Example constructor(5)...\n";
    std::unique_ptr<Foo> up7(new Foo());
    std::unique_ptr<Foo> up8(move(up7)); //ownership is transfered to up8
    up8.reset();
 
    //constructor 6
    std::cout << "Example constructor(6)...\n\n";
    std::unique_ptr<Foo> up9(nullptr);
 
    //constructor 7 - D is move constructed
    D d;
    std::cout << "Example constructor(7)...\n";
    std::unique_ptr<Foo, D> up10(new Foo(), d);     //D is not a reference
    std::unique_ptr<Foo, D> up11(move(up10));       //D is move constructed
    up11.reset();
 
    //constructor 7 - D is copy constructed
    std::unique_ptr<Foo, D&> up12(new Foo(), d);    //D is a reference
    std::unique_ptr<Foo, D> up13(move(up12));       //D is copy constructed
    up13.reset();
 
    //constructor 8
    std::cout << "Example constructor(8)...\n";
    std::auto_ptr<Foo> up14(new Foo());
    std::unique_ptr<Foo> up15(move(up14));
    up15.reset();
 
}