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std::unique_ptr::operator=

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< cpp‎ | memory‎ | unique 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 :: unique_ptr
Member-Funktionen
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Member functions
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unique_ptr::unique_ptr
unique_ptr::~unique_ptr
unique_ptr::operator=
Modifiers
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Modifiers
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unique_ptr::release
unique_ptr::reset
unique_ptr::swap
Beobachter
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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-Member-Funktionen
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Non-member functions
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operator==
operator!=
operator<
operator>
operator<=
operator>
operator>=
std::swap
std::hash
 
unique_ptr& operator=( unique_ptr&& r );
(1) (seit C++11)
template< class U, class E >
unique_ptr& operator=( unique_ptr<U,E>&& r );
(1) (seit C++11)
unique_ptr& operator=( nullptr_t );
(2) (seit C++11)
1)
Transfers Eigentum an dem Gegenstand, auf den r um *this, als ob durch den Aufruf reset(r.release()) durch eine Zuweisung von std::forward<E>(r.get_deleter()) gefolgt.
Original:
Transfers ownership of the object pointed to by r to *this as if by calling reset(r.release()) followed by an assignment from std::forward<E>(r.get_deleter()).
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2)
Effektiv das gleiche wie der Aufruf reset() .
Original:
Effectively the same as calling reset().
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Beachten Sie, dass die unique_ptr Zuweisungsoperator akzeptiert nur XValues, die typischerweise durch std::move erzeugt. (Der unique_ptr Klasse explizit löscht seine lvalue Copy-Konstruktor und lvalue Zuweisungsoperator.)
Original:
Note that unique_ptr's assignment operator only accepts XValues, which are typically generated by std::move. (The unique_ptr class explicitly deletes its lvalue copy constructor and lvalue assignment operator.)
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Inhaltsverzeichnis

[Bearbeiten] Parameter

r -
Smart-Pointer aus dem Eigentum übertragen werden
Original:
smart pointer from which ownership will be transfered
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[Bearbeiten] Rückgabewert

*this

[Bearbeiten] Ausnahmen

noexcept specification:  
noexcept
  (seit C++11)

[Bearbeiten] Beispiel

#include <iostream>
#include <memory>
 
struct Foo {
    Foo() { std::cout << "Foo\n"; }
    ~Foo() { std::cout << "~Foo\n"; }
};
 
int main() 
{
    std::unique_ptr<Foo> p1;
 
    {
        std::cout << "Creating new Foo...\n";
        std::unique_ptr<Foo> p2(new Foo);
 
        p1 = std::move(p2);
        std::cout << "About to leave inner block...\n";
 
        // Foo instance will continue to live, 
        // despite p2 going out of scope
    }
 
    std::cout << "About to leave program...\n";
}

Output:

Creating new Foo...
Foo
About to leave inner block...
About to leave program...
~Foo