std::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::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.

map::map

map::~map

map::operator=

map::get_allocator

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

map::at

map::operator[]

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.

map::begin map::cbegin (C++11)

map::end map::cend (C++11)

map::rbegin map::crbegin (C++11)

map::rend map::crend (C++11)

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.

map::empty

map::size

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.

map::clear

map::insert

map::emplace (C++11)

map::emplace_hint (C++11)

map::erase

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.

map::count

map::find

map::equal_range

map::lower_bound

map::upper_bound

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.

map::key_comp

map::value_comp

 

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

Sostituisce il contenuto del contenitore.

Original:

Replaces the contents of the container.

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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.

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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.

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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.

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2)

Costante.

Original:

Constant.

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Esempio

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

Original:

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

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#include <map>#include <iostream>   void display_sizes(conststd::map<int, int>&nums1, conststd::map<int, int>&nums2, conststd::map<int, int>&nums3){std::cout<<"nums1: "<< nums1.size()<<" nums2: "<< nums2.size()<<" nums3: "<< nums3.size()<<'\n';}   int main(){std::map<int, int> nums1 {{3, 1}, {4, 1}, {5, 9}};std::map<int, int> nums2;std::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 map (metodo pubblico)