std::unordered_map::operator=

 

C++

Linguaggio

Concetti

Libreria di Utilità

Stringhe

Contenitori

Algoritmi

Iteratori

Libreria matematca

Input/output

Localizzazione

Espressioni regolari(C++11)

Operazioni atomicche(C++11)

Multithreading(C++11)

 

Contenitori libreria

array (C++11)

vector

deque

forward_list (C++11)

list

set

multiset

map

multimap

unordered_set (C++11)

unordered_multiset (C++11)

unordered_map (C++11)

unordered_multimap (C++11)

stack

queue

priority_queue

 

std::unordered_map

Membri funzioni Original: Member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

unordered_map::unordered_map

unordered_map::~unordered_map

unordered_map::operator=

unordered_map::get_allocator

Iteratori Original: Iterators The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

unordered_map::begin unordered_map::cbegin

unordered_map::end unordered_map::cend

Capacità Original: Capacity The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

unordered_map::erase

unordered_map::size

unordered_map::max_size

Modificatori Original: Modifiers The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

unordered_map::clear

unordered_map::insert

unordered_map::emplace

unordered_map::emplace_hint

unordered_map::erase

unordered_map::swap

Lookup Original: Lookup The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

unordered_map::count

unordered_map::find

unordered_map::equal_range

Benna interfaccia Original: Bucket interface The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

unordered_map::begin2

unordered_map::end2

unordered_map::bucket_count

unordered_map::max_bucket_count

unordered_map::bucket_size

unordered_map::bucket

Politica di Hash Original: Hash policy The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

unordered_map::load_factor

unordered_map::max_load_factor

unordered_map::rehash

unordered_map::reserve

Osservatori Original: Observers The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

unordered_map::hash_function

unordered_map::key_eq

 

unordered_map& operator=(const unordered_map& other );	(1)	(dal C++11)
unordered_map& operator=( unordered_map&& other );	(2)	(dal C++11)

Sostituisce il contenuto del contenitore.

Original:

Replaces the contents of the container.

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

1)

Copia operatore di assegnazione. Sostituisce il contenuto con una copia del contenuto di other.

Original:

Copy assignment operator. Replaces the contents with a copy of the contents of other.

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

2)

Spostare operatore di assegnazione. Sostituisce il contenuto con quelli della other usando la semantica spostamento (cioè i dati in other viene spostato da other in questo contenitore). other è in stato valido, ma non specificato in seguito.

Original:

Move assignment operator. Replaces the contents with those of other using move semantics (i.e. the data in other is moved from other into this container). other is in valid, but unspecified state afterwards.

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

Parametri

other

-

un altro contenitore per essere utilizzato come sorgente Original: another container to be used as source The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Valore di ritorno

*this

Complessità

1)

Lineare nella dimensione del contenitore.

Original:

Linear in the size of the container.

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

2)

Costante.

Original:

Constant.

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

Esempio

Il codice seguente utilizza assegnare una std::unordered_map ad un altro:

Original:

The following code uses to assign one std::unordered_map to another:

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

#include <unordered_map>#include <iostream>   void display_sizes(conststd::unordered_map<int, int>&nums1, conststd::unordered_map<int, int>&nums2, conststd::unordered_map<int, int>&nums3){std::cout<<"nums1: "<< nums1.size()<<" nums2: "<< nums2.size()<<" nums3: "<< nums3.size()<<'\n';}   int main(){std::unordered_map<int, int> nums1 {{3, 1}, {4, 1}, {5, 9}};std::unordered_map<int, int> nums2;std::unordered_map<int, int> nums3;   std::cout<<"Initially:\n"; display_sizes(nums1, nums2, nums3);   // copy assignment copies data from nums1 to nums2 nums2 = nums1;   std::cout<<"After assigment:\n"; display_sizes(nums1, nums2, nums3);   // move assignment moves data from nums1 to nums3,// modifying both nums1 and nums3 nums3 =std::move(nums1);   std::cout<<"After move assigment:\n"; display_sizes(nums1, nums2, nums3);}

Output:

Initially: nums1: 4 nums2: 0 nums3: 0 After assigment: nums1: 4 nums2: 4 nums3: 0 After move assigment: nums1: 0 nums2: 4 nums3: 4

Vedi anche

(costruttore)	costruisce il unordered_map (metodo pubblico)