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std::unordered_multimap::operator=

Da cppreference.com.

 
 
 
std :: unordered_multimap
Membri funzioni
Original:
Member functions
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unordered_multimap::unordered_multimap
unordered_multimap::~unordered_multimap
unordered_multimap::operator=
unordered_multimap::get_allocator
Iteratori
Original:
Iterators
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unordered_multimap::begin
unordered_multimap::cbegin
unordered_multimap::end
unordered_multimap::cend
Capacità
Original:
Capacity
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unordered_multimap::erase
unordered_multimap::size
unordered_multimap::max_size
Modificatori
Original:
Modifiers
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unordered_multimap::clear
unordered_multimap::insert
unordered_multimap::emplace
unordered_multimap::emplace_hint
unordered_multimap::erase
unordered_multimap::swap
Lookup
Original:
Lookup
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unordered_multimap::count
unordered_multimap::find
unordered_multimap::equal_range
Benna interfaccia
Original:
Bucket interface
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unordered_multimap::begin2
unordered_multimap::end2
unordered_multimap::bucket_count
unordered_multimap::max_bucket_count
unordered_multimap::bucket_size
unordered_multimap::bucket
Politica di Hash
Original:
Hash policy
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unordered_multimap::load_factor
unordered_multimap::max_load_factor
unordered_multimap::rehash
unordered_multimap::reserve
Osservatori
Original:
Observers
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unordered_multimap::hash_function
unordered_multimap::key_eq
 
unordered_multimap& operator=( const unordered_multimap& other );
(1) (dal C++11)
unordered_multimap& operator=( unordered_multimap&& 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_multimap ad un altro:
Original:
The following code uses to assign one std::unordered_multimap to another:
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#include <unordered_map>
#include <iostream>
 
void display_sizes(const std::unordered_multimap<int, int> &nums1,
                   const std::unordered_multimap<int, int> &nums2,
                   const std::unordered_multimap<int, int> &nums3)
{
    std::cout << "nums1: " << nums1.size() 
              << " nums2: " << nums2.size()
              << " nums3: " << nums3.size() << '\n';
}
 
int main()
{
    std::unordered_multimap<int, int> nums1 {{3, 1}, {4, 1}, {5, 9}};
    std::unordered_multimap<int, int> nums2;
    std::unordered_multimap<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

[modifica] Vedi anche

costruisce il unordered_multimap
Original:
constructs the unordered_multimap
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(membro pubblico funzione) [edit]