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std::unordered_map - cppreference.com

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Elemento definito nell'header

<unordered_map>

template< class Key, class T, class Hash = std::hash<Key>, class KeyEqual = std::equal_to<Key>, class Allocator = std::allocator< std::pair<const Key, T> > > class unordered_map;

 (dal C++11)

La mappa non ordinata è un contenitore associativo che contiene coppie chiave-valore con chiavi univoche. Ricerca, inserimento e rimozione hanno in media complessità in tempo costante.

std::unordered_map soddisfi i requisiti di Container, AllocatorAwareContainer, UnorderedAssociativeContainer.

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Membri tipi

Membro tipo

Original:

Member type

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 Definition
key_type Key [modifica]
mapped_type T [modifica]
value_type std::pair<const Key, T> [modifica]
size_type Tipo intero senza segno (generalmente size_t)[modifica]
difference_type Tipo intero con segno (generalmente ptrdiff_t) [modifica]
hasher Hash [modifica]
key_equal KeyEqual [modifica]
allocator_type Allocator [modifica]
reference value_type& [modifica]
const_reference const value_type& [modifica]
pointer std::allocator_traits<Allocator>::pointer [modifica]
const_pointer std::allocator_traits<Allocator>::const_pointer [modifica]
iterator ForwardIterator [modifica]
const_iterator Iteratore in avanti su costanti[modifica]
local_iterator

Un tipo di iteratore cui categoria, il valore, la differenza, puntatore tipi di riferimento and
sono gli stessi iterator. Questo iterator
può essere utilizzato per scorrere un secchio unico, ma non tra secchi

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An iterator type whose category, value, difference, pointer and
reference types are the same as iterator. This iterator
can be used to iterate through a single bucket but not across buckets

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[modifica]
const_local_iterator

Un tipo di iteratore cui categoria, il valore, la differenza, puntatore tipi di riferimento and
sono gli stessi const_iterator. Questo iterator
può essere utilizzato per scorrere un secchio unico, ma non tra secchi

Original:

An iterator type whose category, value, difference, pointer and
reference types are the same as const_iterator. This iterator
can be used to iterate through a single bucket but not across buckets

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[modifica]

Membri funzioni

mihai are mere

costruisce il unordered_map
(metodo pubblico) [modifica]
distrugge il unordered_map
(metodo pubblico) [modifica]

assegna valori al contenitore

Original:

assigns values to the container

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(metodo pubblico) [modifica]

restituisce l'allocatore associato

Original:

returns the associated allocator

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(metodo pubblico) [modifica]

Iteratori

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Iterators

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restituisce un iteratore all'inizio

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returns an iterator to the beginning

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(metodo pubblico) [modifica]

restituisce un iteratore fino alla fine

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returns an iterator to the end

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(metodo pubblico) [modifica]

Capacità

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Capacity

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verifica se il contenitore è vuoto

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checks whether the container is empty

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(metodo pubblico) [modifica]

restituisce il numero di elementi

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returns the number of elements

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(metodo pubblico) [modifica]

restituisce il massimo numero possibile di elementi

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returns the maximum possible number of elements

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(metodo pubblico) [modifica]

Modificatori

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Modifiers

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cancella il contenuto

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clears the contents

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(metodo pubblico) [modifica]

inserti di elementi

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inserts elements

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(metodo pubblico) [modifica]
constructs element in-place
(metodo pubblico) [modifica]

costruisce elementi in-place con un suggerimento

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constructs elements in-place using a hint

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(metodo pubblico) [modifica]

cancella elementi

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erases elements

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(metodo pubblico) [modifica]

swap il contenuto

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swaps the contents

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(metodo pubblico) [modifica]

Lookup

Original:

Lookup

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accedere elemento specificato con verifica dei limiti

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access specified element with bounds checking

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(metodo pubblico) [modifica]

accedere elemento specificato

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access specified element

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(metodo pubblico) [modifica]

restituisce il numero di elementi corrispondenti chiave specifica

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returns the number of elements matching specific key

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(metodo pubblico) [modifica]

trova elemento con chiave specifica

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finds element with specific key

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(metodo pubblico) [modifica]

Benna interfaccia

Original:

Bucket interface

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restituisce un iteratore all'inizio della benna specificato

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returns an iterator to the beginning of the specified bucket

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(metodo pubblico) [modifica]

ritorna un iteratore alla fine della benna specificato

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returns an iterator to the end of the specified bucket

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(metodo pubblico) [modifica]

restituisce il numero di secchi

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returns the number of buckets

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(metodo pubblico) [modifica]
returns the maximum number of buckets
(metodo pubblico) [modifica]

restituisce il numero di elementi in bucket specifico

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returns the number of elements in specific bucket

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(metodo pubblico) [modifica]

restituisce la benna per la chiave specifica

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returns the bucket for specific key

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(metodo pubblico) [modifica]

Politica di Hash

Original:

Hash policy

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restituisce il numero medio di elementi per secchio

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returns average number of elements per bucket

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(metodo pubblico) [modifica]

gestisce massimo numero medio di elementi per secchio

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manages maximum average number of elements per bucket

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(metodo pubblico) [modifica]
reserves at least the specified number of buckets.
This regenerates the hash table.
(metodo pubblico) [modifica]

riserva spazio per almeno il numero specificato di elements.
This rigenera la tabella di hash .

Original:

reserves space for at least the specified number of elements.
This regenerates the hash table.

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(metodo pubblico) [modifica]

Osservatori

Original:

Observers

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torna funzione hash utilizzata per le chiavi

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returns function used to hash the keys

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(metodo pubblico) [modifica]

restituisce la funzione utilizzata per confrontare le chiavi per l'uguaglianza

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returns the function used to compare keys for equality

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(metodo pubblico) [modifica]

Non membri funzioni

confronta i valori del unordered_map

Original:

compares the values in the unordered_map

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(funzione di modello) [modifica]

specializzata l'algoritmo std::swap

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specializes the std::swap algorithm

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(funzione di modello) [modifica]