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std::unordered_map::operator=

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std::unordered_map
Member-Funktionen
Original:
Member functions
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unordered_map::unordered_map
unordered_map::~unordered_map
unordered_map::operator=
unordered_map::get_allocator
Iteratoren
Original:
Iterators
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unordered_map::begin
unordered_map::cbegin
unordered_map::end
unordered_map::cend
Kapazität
Original:
Capacity
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unordered_map::erase
unordered_map::size
unordered_map::max_size
Modifiers
Original:
Modifiers
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unordered_map::clear
unordered_map::insert
unordered_map::emplace
unordered_map::emplace_hint
unordered_map::erase
unordered_map::swap
Lookup
Original:
Lookup
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unordered_map::count
unordered_map::find
unordered_map::equal_range
Eimer Schnittstelle
Original:
Bucket interface
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unordered_map::begin2
unordered_map::end2
unordered_map::bucket_count
unordered_map::max_bucket_count
unordered_map::bucket_size
unordered_map::bucket
Hash Politik
Original:
Hash policy
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unordered_map::load_factor
unordered_map::max_load_factor
unordered_map::rehash
unordered_map::reserve
Beobachter
Original:
Observers
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unordered_map::hash_function
unordered_map::key_eq
 
unordered_map& operator=( const unordered_map& other );
(1) (seit C++11)
unordered_map& operator=( unordered_map&& other );
(2) (seit C++11)
Ersetzt den Inhalt des Behälters .
Original:
Replaces the contents of the container.
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1)
Kopieren Zuweisungsoperator. Ersetzt den Inhalt mit einer Kopie des Inhalts other .
Original:
Copy assignment operator. Replaces the contents with a copy of the contents of other.
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2)
Bewegen 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 .
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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Inhaltsverzeichnis

[Bearbeiten] Parameter

other -
ein weiterer Container, die als Quelle verwendet werden
Original:
another container to be used as source
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[Bearbeiten] Rückgabewert

*this

[Bearbeiten] Komplexität

1)
Linear in der Größe des Behälters .
Original:
Linear in the size of the container.
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2)
Constant .
Original:
Constant.
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[Bearbeiten] Beispiel

Der folgende Code verwendet um ein std::unordered_map einem anderen zuweisen:
Original:
The following code uses to assign one std::unordered_map to another:
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#include <unordered_map>
#include <iostream>
 
void display_sizes(const std::unordered_map<int, int> &nums1,
                   const std::unordered_map<int, int> &nums2,
                   const std::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

[Bearbeiten] Siehe auch

konstruiert den unordered_map
(öffentliche Elementfunktion) [edit]