std::scoped_allocator_adaptor::construct – cppreference.com
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Erzeugt ein Objekt in zugeordnet, aber nicht initialisiert Speicher, auf den p mit OuterAllocator und die vorgesehenen Konstruktorargumente. Wenn das Objekt vom Typ dass selbst verwendet Zuordnern, oder wenn es std :: Paar ist, übergibt InnerAllocator auf dem aufgebauten Objekt .
Original:
Constructs an object in allocated, but not initialized storage pointed to by p using OuterAllocator and the provided constructor arguments. If the object is of type that itself uses allocators, or if it is std::pair, passes InnerAllocator down to the constructed object.
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Zuerst bestimmt die äußerste allocator Typ OUTERMOST: es ist die Art, die durch den Aufruf this->outer_allocator(), und rufen dann die outer_allocator() Member-Funktion rekursiv auf das Ergebnis dieses Aufrufs bis zum Erreichen der Typ, der keine solche Member-Funktion ist zurückgekehrt wäre. Diese Art ist die äußerste Zuordner .
Original:
First, determines the outermost allocator type OUTERMOST: it is the type that would be returned by calling this->outer_allocator(), and then calling the outer_allocator() member function recursively on the result of this call until reaching the type that has no such member function. That type is the outermost allocator.
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Dann:
Original:
Then:
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1)
Wenn std::uses_allocator<T, inner_allocator_type>::value==false (die Art T nicht verwendet Zuweiser) und wenn std::is_constructible<T, Args...>::value==true, dann ruft
Original:
If std::uses_allocator<T, inner_allocator_type>::value==false (the type T does not use allocators) and if std::is_constructible<T, Args...>::value==true, then calls
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std::allocator_traits<OUTERMOST>::construct( OUTERMOST(*this), p, std::forward<Args>(args)... );
Andernfalls, wenn std::uses_allocator<T, inner_allocator_type>::value==true (die Art T verwendet Zuweiser, zB ein Container ist) und wenn std::is_constructible<T, std::allocator_arg_t, inner_allocator_type, Args...>::value==true, dann ruft
Original:
Otherwise, if std::uses_allocator<T, inner_allocator_type>::value==true (the type T uses allocators, e.g. it is a container) and if std::is_constructible<T, std::allocator_arg_t, inner_allocator_type, Args...>::value==true, then calls
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std::allocator_traits<OUTERMOST>::construct( OUTERMOST(*this), p, std::allocator_arg, inner_allocator(), std::forward<Args>(args)... );
Ansonsten std::uses_allocator<T, inner_allocator_type>::value==true (die Art T verwendet Zuweiser, zB ist es ein Container), und wenn std::is_constructible<T, Args..., inner_allocator_type>::value==true, dann ruft
Original:
Otherwise, std::uses_allocator<T, inner_allocator_type>::value==true (the type T uses allocators, e.g. it is a container) and if std::is_constructible<T, Args..., inner_allocator_type>::value==true, then calls
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std::allocator_traits<OUTERMOST>::construct( OUTERMOST(*this), p, std::forward<Args>(args)..., inner_allocator());
Andernfalls wird Kompilierungsfehler ausgegeben, denn obwohl std::uses_allocator<T>, dass T Allocator-aware vorliegt, ist es entweder Form Allocator-akzeptierenden Konstruktoren fehlt .
Original:
Otherwise, compilation error is issued because although std::uses_allocator<T> claimed that T is allocator-aware, it lacks either form of allocator-accepting constructors.
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2)
Erstens, wenn entweder T1 oder T2 Zuordner-bekannt ist, ändert die Tupel und x y passende innere Zuordner beinhalten, was in den zwei neuen Tupeln xprime und yprime, gemäß den drei folgenden Regeln:
Original:
First, if either T1 or T2 is allocator-aware, modifies the tuples x and y to include the appropriate inner allocator, resulting in the two new tuples xprime and yprime, according to the following three rules:
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2a), wenn T1 nicht Allocator-aware (std::uses_allocator<T1, inner_allocator_type>::value==false, dann xprime ist x, unverändert. (Es ist auch erforderlich, dass std::is_constructible<T1, Args1...>::value==true)
Original:
2a) if T1 is not allocator-aware (std::uses_allocator<T1, inner_allocator_type>::value==false, then xprime is x, unmodified. (it is also required that std::is_constructible<T1, Args1...>::value==true)
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2b), wenn T1 ist allocator-aware (std::uses_allocator<T1, inner_allocator_type>::value==true) und seine Konstruktor nimmt einen Zuordner tag ( std::is_constructible<T1, std::allocator_arg_t, inner_allocator_type, Args1...>::value==true, dann xprime ist
Original:
2b) if T1 is allocator-aware (std::uses_allocator<T1, inner_allocator_type>::value==true), and its constructor takes an allocator tag (std::is_constructible<T1, std::allocator_arg_t, inner_allocator_type, Args1...>::value==true, then xprime is
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std::tuple_cat( std::tuple<std::allocator_arg_t, inner_allocator_type&>( std::allocator_arg, inner_allocator_type() ), x)
2c), wenn T1 ist allocator-aware (std::uses_allocator<T1, inner_allocator_type>::value==true) und seinem Konstruktor nimmt die Zuweisung als letztes Argument (std::is_constructible<T1, Args1..., inner_allocator_type>::value==true), dann xprime ist std::tuple_cat(x, std::tuple<inner_allocator_type&>(inner_allocator_type())) .
Original:
2c) if T1 is allocator-aware (std::uses_allocator<T1, inner_allocator_type>::value==true), and its constructor takes the allocator as the last argument (std::is_constructible<T1, Args1..., inner_allocator_type>::value==true), then xprime is std::tuple_cat(x, std::tuple<inner_allocator_type&>(inner_allocator_type())).
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Dieselben Regeln gelten für T2 und der Austausch von y mit yprime
Original:
Same rules apply to T2 and the replacement of y with yprime
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Sobald xprime und yprime konstruiert sind (dies erfordert auch, dass alle Typen in Args1 ... und Args2 ... CopyConstructible sind), baut das Paar p in zugewiesenen Lagerstätten durch den Aufruf
Original:
Once xprime and yprime are constructed (this also requires that all types in Args1... and Args2... are CopyConstructible), constructs the pair p in allocated storage by calling
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std::allocator_traits<OUTERMOST>::construct( OUTERMOST(*this), p, std::piecewise_construct, xprime, yprime);
3)
Entspricht construct(p, std::piecewise_construct, std::tuple<>(), std::tuple<>()), das heißt, geht die innere allocator auf des Paares Mitglied Typen, wenn sie sie zu akzeptieren .
Original:
Equivalent to construct(p, std::piecewise_construct, std::tuple<>(), std::tuple<>()), that is, passes the inner allocator on to the pair's member types if they accept them.
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4)
Entspricht
Original:
Equivalent to
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construct(p, std::piecewise_construct, std::forward_as_tuple(std::forward<U>(x)), std::forward_as_tuple(std::forward<V>(y)))
5)
Entspricht
Original:
Equivalent to
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construct(p, std::piecewise_construct, std::forward_as_tuple(xy.first), std::forward_as_tuple(xy.second))
6)
Entspricht
Original:
Equivalent to
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construct(p, std::piecewise_construct, std::forward_as_tuple(std::forward<U>(xy.first)), std::forward_as_tuple(std::forward<V>(xy.second)))
Parameter
| p | - | Zeiger auf reservierten, aber nicht initialisiert Lagerung Original: pointer to allocated, but not initialized storage The text has been machine-translated via Google Translate. |
| args... | - | der Konstruktor Argumente an den Konstruktor Original: the constructor arguments to pass to the constructor of The text has been machine-translated via Google Translate. |
| x | - | der Konstruktor Argumente an den Konstruktor Original: the constructor arguments to pass to the constructor of The text has been machine-translated via Google Translate. |
| y | - | der Konstruktor Argumente an den Konstruktor Original: the constructor arguments to pass to the constructor of The text has been machine-translated via Google Translate. |
| xy | - | das Paar, dessen zwei Mitglieder sind die Konstruktor Argumente für Original: the pair whose two members are the constructor arguments for The text has been machine-translated via Google Translate. |
Rückgabewert
(None)
Original:
(none)
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Notes
Diese Funktion wird aufgerufen (durch std::allocator_traits) von jedem Zuordner-fähigen Objekt wie std::vector, die einen gegebenen std::scoped_allocator_adaptor als Zuordner zu verwenden war. Da inner_allocator selbst ist ein Beispiel für std::scoped_allocator_adaptor, wird diese Funktion auch aufgerufen, wenn die Zuweisung-aware Objekte durch diese Funktion konstruiert Bau ihrer eigenen Mitglieder zu starten .
Original:
This function is called (through std::allocator_traits) by any allocator-aware object, such as std::vector, that was given a std::scoped_allocator_adaptor as the allocator to use. Since inner_allocator is itself an instance of std::scoped_allocator_adaptor, this function will also be called when the allocator-aware objects constructed through this function start constructing their own members.
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Siehe auch
konstruiert ein Objekt in dem zugewiesenen Speicher Original: constructs an object in the allocated storage The text has been machine-translated via Google Translate. (Funktions-Template) [edit] | |
baut ein Objekt in zugewiesenen Lagerstätten Original: constructs an object in allocated storage The text has been machine-translated via Google Translate. (öffentliche Elementfunktion of std::allocator) [edit]
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