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std::vector::operator=

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< cpp‎ | container‎ | vector
 
 
 
std::vector
Member-Funktionen
Original:
Member functions
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vector::vector
vector::~vector
vector::operator=
vector::assign
vector::get_allocator
Elementzugriff zerstört
Original:
Element access
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vector::at
vector::operator[]
vector::front
vector::back
vector::data(C++11)
Iteratoren
Original:
Iterators
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vector::begin
vector::cbegin

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

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

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

(C++11)
Kapazität
Original:
Capacity
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vector::empty
vector::size
vector::max_size
vector::reserve
vector::capacity
vector::shrink_to_fit(C++11)
Modifiers
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Modifiers
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vector::clear
vector::insert
vector::emplace(C++11)
vector::erase
vector::push_back
vector::emplace_back(C++11)
vector::pop_back
vector::resize
vector::swap
 
vector& operator=( const vector& other );
(1)
vector& operator=( vector&& 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::vector einem anderen zuweisen:

#include <vector>
#include <iostream>
 
void display_sizes(const std::vector<int> &nums1,
                   const std::vector<int> &nums2,
                   const std::vector<int> &nums3)
{
    std::cout << "nums1: " << nums1.size() 
              << " nums2: " << nums2.size()
              << " nums3: " << nums3.size() << '\n';
}
 
int main()
{
    std::vector<int> nums1 {3, 1, 4, 6, 5, 9};
    std::vector<int> nums2; 
    std::vector<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 vector
(öffentliche Elementfunktion) [edit]
weist Werte auf den Behälter
Original:
assigns values to the container
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(öffentliche Elementfunktion) [edit]