std::unordered_multiset::operator=

 

C++

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Regular expressions library (C++11)

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Containers library

array (C++11)

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list

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unordered_set (C++11)

unordered_multiset (C++11)

unordered_map (C++11)

unordered_multimap (C++11)

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std::unordered_multiset

Member functions

unordered_multiset::unordered_multiset

unordered_multiset::~unordered_multiset

unordered_multiset::operator=

unordered_multiset::get_allocator

Iterators

unordered_multiset::begin unordered_multiset::cbegin

unordered_multiset::end unordered_multiset::cend

Capacity

unordered_multiset::erase

unordered_multiset::size

unordered_multiset::max_size

Modifiers

unordered_multiset::clear

unordered_multiset::insert

unordered_multiset::emplace

unordered_multiset::emplace_hint

unordered_multiset::erase

unordered_multiset::swap

Lookup

unordered_multiset::count

unordered_multiset::find

unordered_multiset::equal_range

Bucket interface

unordered_multiset::begin2

unordered_multiset::end2

unordered_multiset::bucket_count

unordered_multiset::max_bucket_count

unordered_multiset::bucket_size

unordered_multiset::bucket

Hash policy

unordered_multiset::load_factor

unordered_multiset::max_load_factor

unordered_multiset::rehash

unordered_multiset::reserve

Observers

unordered_multiset::hash_function

unordered_multiset::key_eq

 

unordered_multiset& operator=( const unordered_multiset& other );	(1)	(since C++11)
unordered_multiset& operator=( unordered_multiset&& other );	(2)	(since C++11)

Replaces the contents of the container.

1) Copy assignment operator. Replaces the contents with a copy of the contents of other.

2) 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 a valid but unspecified state afterwards.

Parameters

other

-

another container to be used as source

Return value

*this

Complexity

1) Linear in the size of the container.

2) Constant.

Example

The following code uses to assign one std::unordered_multiset to another:

run this code

#include <unordered_set>
#include <iostream>
 
void display_sizes(const std::unordered_multiset<int> &nums1,
                   const std::unordered_multiset<int> &nums2,
                   const std::unordered_multiset<int> &nums3)
{
    std::cout << "nums1: " << nums1.size() 
              << " nums2: " << nums2.size()
              << " nums3: " << nums3.size() << '\n';
}
 
int main()
{
    std::unordered_multiset<int> nums1 {3, 1, 4, 6, 5, 9};
    std::unordered_multiset<int> nums2; 
    std::unordered_multiset<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: 6 nums2: 0 nums3: 0
After assigment:
nums1: 6 nums2: 6 nums3: 0
After move assigment:
nums1: 0 nums2: 6 nums3: 6

See also

(constructor)	constructs the unordered_multiset (public member function)