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std::unordered_set::operator=

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C++
 
Contenitori libreria
 
std :: unordered_set
Membri funzioni
Original:
Member functions
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unordered_set::unordered_set
unordered_set::~unordered_set
unordered_set::operator=
unordered_set::get_allocator
Iteratori
Original:
Iterators
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unordered_set::begin
unordered_set::cbegin
unordered_set::end
unordered_set::cend
Capacità
Original:
Capacity
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unordered_set::erase
unordered_set::size
unordered_set::max_size
Modificatori
Original:
Modifiers
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unordered_set::clear
unordered_set::insert
unordered_set::emplace
unordered_set::emplace_hint
unordered_set::erase
unordered_set::swap
Lookup
Original:
Lookup
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unordered_set::count
unordered_set::find
unordered_set::equal_range
Benna interfaccia
Original:
Bucket interface
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unordered_set::begin2
unordered_set::end2
unordered_set::bucket_count
unordered_set::max_bucket_count
unordered_set::bucket_size
unordered_set::bucket
Politica di Hash
Original:
Hash policy
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unordered_set::load_factor
unordered_set::max_load_factor
unordered_set::rehash
unordered_set::reserve
Osservatori
Original:
Observers
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unordered_set::hash_function
unordered_set::key_eq
 
unordered_set& operator=( const unordered_set& other );
 (1) (dal C++11)
unordered_set& operator=( unordered_set&& 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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Indice

[modifica] Parametri

other -
un altro contenitore per essere utilizzato come sorgente
Original:
another container to be used as source
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[modifica] Valore di ritorno

*this

[modifica] 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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[modifica] Esempio

Il codice seguente utilizza assegnare una std::unordered_set ad un altro:
Original:
The following code uses to assign one std::unordered_set to another:
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#include <unordered_set>
#include <iostream>
 
void display_sizes(const std::unordered_set<int> &nums1,
                   const std::unordered_set<int> &nums2,
                   const std::unordered_set<int> &nums3)
{
    std::cout << "nums1: " << nums1.size() 
              << " nums2: " << nums2.size()
              << " nums3: " << nums3.size() << '\n';
}
 
int main()
{
    std::unordered_set<int> nums1 {3, 1, 4, 6, 5, 9};
    std::unordered_set<int> nums2; 
    std::unordered_set<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

[modifica] Vedi anche

 costruisce il unordered_set
(metodo pubblico) [modifica]
Estratto da "https://it.cppreference.com/mwiki/index.php?title=cpp/container/unordered_set/operator%3D&oldid=18044"