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std::unordered_multimap::operator=

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std :: unordered_multimap
Member-Funktionen
Original:
Member functions
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unordered_multimap::unordered_multimap
unordered_multimap::~unordered_multimap
unordered_multimap::operator=
unordered_multimap::get_allocator
Iteratoren
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Iterators
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unordered_multimap::begin
unordered_multimap::cbegin
unordered_multimap::end
unordered_multimap::cend
Kapazität
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Capacity
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unordered_multimap::erase
unordered_multimap::size
unordered_multimap::max_size
Modifiers
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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
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Lookup
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unordered_multimap::count
unordered_multimap::find
unordered_multimap::equal_range
Eimer Schnittstelle
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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
Hash Politik
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Hash policy
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unordered_multimap::load_factor
unordered_multimap::max_load_factor
unordered_multimap::rehash
unordered_multimap::reserve
Beobachter
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Observers
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unordered_multimap::hash_function
unordered_multimap::key_eq
 
unordered_multimap& operator=( const unordered_multimap& other );
(1) (seit C++11)
unordered_multimap& operator=( unordered_multimap&& other );
(2) (seit C++11)

Ersetzt den Inhalt des Containers.

1) Copy-Zuweisungsoperator. Ersetzt den Inhalt mit einer Kopie des Inhalts other .

2) move-Zuweisungsoperator. Ersetzt den Inhalt mit denen unter Verwendung other bewegen Semantik (dh die Daten in other aus other in diesen Behälter bewegt wird). other ist gültig, aber nicht näher Zustand danach .

Inhaltsverzeichnis

[Bearbeiten] Parameter

other - ein weiterer Container, die als Quelle verwendet werden

[Bearbeiten] Rückgabewert

*this

[Bearbeiten] Komplexität

1) Linear in der Größe des Behälters .

2) Constant .

[Bearbeiten] Beispiel

Der folgende Code verwendet um ein std::unordered_multimap einem anderen zuweisen:

#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

[Bearbeiten] Siehe auch

konstruiert den unordered_multimap
(öffentliche Elementfunktion) [edit]