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std::owner_less

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< cpp‎ | memory

 
 
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Defined in header <memory>
template< class T >
struct owner_less; /* undefined */
(1) (dal C++11)
template< class T >
struct owner_less<std::shared_ptr<T>>;
(2) (dal C++11)
template< class T >
struct owner_less<std::weak_ptr<T>>;
(3) (dal C++11)
Questo oggetto funzione fornisce proprietario-based (in alternativa al fair-based) di tipo misto ordinamento sia std::weak_ptr e std::shared_ptr. L'ordine è tale che due puntatori intelligenti confronta equivalente solo se sono entrambi vuoti o se entrambi gestire l'oggetto stesso, anche se i valori dei puntatori prime ottenuta con get() sono diversi (ad esempio perché puntare sottooggetti diverse all'interno dello stesso oggetto )
Original:
This function object provides owner-based (as opposed to value-based) mixed-type ordering of both std::weak_ptr and std::shared_ptr. The order is such that two smart pointers compare equivalent only if they are both empty or if they both manage the same object, even if the values of the raw pointers obtained by get() are different (e.g. because they point at different subobjects within the same object)
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Questo modello di classe è il predicato di confronto preferito durante la creazione di contenitori associativi con std::shared_ptr o std::weak_ptr come chiavi, cioè,
Original:
This class template is the preferred comparison predicate when building associative containers with std::shared_ptr or std::weak_ptr as keys, that is,
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std::map<std::shared_ptr<T>, U, std::owner_less<std::shared_ptr<T>>>

or

std::map<std::weak_ptr<T>, U, std::owner_less<std::weak_ptr<T>>>.

Il operator< predefinito non è definito per i puntatori deboli, e può erroneamente considerare due indicatori condivisi per lo stesso oggetto non equivalente (vedi shared_ptr::owner_before)
Original:
The default operator< is not defined for weak pointers, and may wrongly consider two shared pointers for the same object non-equivalent (see shared_ptr::owner_before)
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[modifica] Membri tipi

Membro tipo
Original:
Member type
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Definition
result_type bool
first_argument_type 1) T
2) std::shared_ptr<T>
3) std::weak_ptr<T>
second_argument_type 1) T
2) std::shared_ptr<T>
3) std::weak_ptr<T>

[modifica] Membri funzioni

mette a confronto i suoi argomenti con proprietario a base semantica
Original:
compares its arguments using owner-based semantics
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(funzione)

[modifica] Vedi anche

fornisce proprietario a base di ordinazione di puntatori condivisi
Original:
provides owner-based ordering of shared pointers
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(membro pubblico of std::shared_ptr funzione) [edit]