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std::unique_ptr::unique_ptr

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< cpp‎ | memory‎ | unique ptr

 
 
 
La gestion dynamique de la mémoire
Faible niveau de gestion de la mémoire
Répartiteurs
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 initialisée stockage
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
Pointeurs intelligents
Original:
Smart pointers
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unique_ptr (C++11)
shared_ptr (C++11)
weak_ptr (C++11)
auto_ptr (obsolète)
owner_less (C++11)
enable_shared_from_this (C++11)
bad_weak_ptr (C++11)
default_delete (C++11)
Soutien garbage collection
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)
Divers
Original:
Miscellaneous
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pointer_traits (C++11)
addressof (C++11)
align (C++11)
Bibliothèque C
Original:
C Library
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std :: unique_ptr
Les fonctions membres
Original:
Member functions
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unique_ptr::unique_ptr
unique_ptr::~unique_ptr
unique_ptr::operator=
Modificateurs
Original:
Modifiers
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unique_ptr::release
unique_ptr::reset
unique_ptr::swap
Des observateurs
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[]
Tiers fonctions
Original:
Non-member functions
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operator==
operator!=
operator<
operator>
operator<=
operator>
operator>=
std::swap
std::hash
 
constexpr unique_ptr();
(1) (depuis C++11)
explicit unique_ptr( pointer p );
(2) (depuis C++11)
unique_ptr( pointer p, d1 );
(3) (depuis C++11)
unique_ptr( pointer p, d2 );
(4) (depuis C++11)
unique_ptr( unique_ptr&& u );
(5) (depuis C++11)
constexpr unique_ptr( nullptr_t );
(6) (depuis C++11)
template< class U, class E >
unique_ptr( unique_ptr<U, E>&& u );
(7) (depuis C++11)
template< class U >
unique_ptr( auto_ptr<U>&& u );
(8) (depuis C++11)
1)
Construit un std::unique_ptr vide .
Original:
Constructs an empty std::unique_ptr.
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2)
Construit un std::unique_ptr qui détient p, l'initialisation du pointeur stocké avec p et la valeur de l'initialisation du stockés 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)
Construit un objet qui possède std::unique_ptr p, l'initialisation du pointeur stocké avec p et initialiser un D deleter comme ci-dessous (dépend si D est un type référence)
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)
Si D est A type non-référence, les signatures sont:
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)
Si D est une lvalue de type A&-référence, les signatures sont:
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)
Si D est une lvalue de type const A&-référence, les signatures sont:
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)
Construit un unique_ptr en transférant la propriété à partir de u *this .
Original:
Constructs a unique_ptr by transferring ownership from u to *this.
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6)
Construit un std::unique_ptr vide .
Original:
Constructs an empty std::unique_ptr.
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7)
Construit un unique_ptr par le transfert de propriété à partir de u *this, où u est réalisé avec un suppresseur spécifié (E). Cela dépend si E est un type référence, comme suit:
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)
si E est un type référence, cette deleter est construit à partir d'une copie de deleter u .
Original:
if E is a reference type, this deleter is copy constructed from u's deleter.
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b)
si E est un type non-référence, ce suppresseur est construit à partir de déménagement suppresseur de u .
Original:
if E is a non-reference type, this deleter is move constructed from u's deleter.
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8)
Construit un unique_ptr où le pointeur stocké est initialisé avec u.release() et le deleter est stocké valeur initialisée .
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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[modifier] Paramètres

p -
un pointeur vers un objet à gérer
Original:
a pointer to an object to manage
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d1,d2 -
un deleter à utiliser pour détruire l'objet
Original:
a deleter to use to destroy the object
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u -
un autre pointeur intelligent d'acquérir la propriété de
Original:
another smart pointer to acquire the ownership from
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[modifier] Exceptions

noexcept specification:  
noexcept
   (depuis C++11)

[modifier] Exemple

#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();
 
}