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std::unordered_map::operator=

Da cppreference.com

 
 
 
std::unordered_map
Funções de membro
Original:
Member functions
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unordered_map::unordered_map
unordered_map::~unordered_map
unordered_map::operator=
unordered_map::get_allocator
Iteradores
Original:
Iterators
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unordered_map::begin
unordered_map::cbegin
unordered_map::end
unordered_map::cend
Capacidade
Original:
Capacity
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unordered_map::erase
unordered_map::size
unordered_map::max_size
Modificadores
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
Pesquisa
Original:
Lookup
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unordered_map::count
unordered_map::find
unordered_map::equal_range
Interface de balde
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
Política de hash
Original:
Hash policy
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unordered_map::load_factor
unordered_map::max_load_factor
unordered_map::rehash
unordered_map::reserve
Observadores
Original:
Observers
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unordered_map::hash_function
unordered_map::key_eq
 
unordered_map& operator=( const unordered_map& other );
(1) (a partir do C++ 11)
unordered_map& operator=( unordered_map&& other );
(2) (a partir do C++ 11)
Substitui o conteúdo do recipiente.
Original:
Replaces the contents of the container.
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1)
Copiar operador de atribuição. Substitui o conteúdo com uma cópia do conteúdo do other.
Original:
Copy assignment operator. Replaces the contents with a copy of the contents of other.
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2)
Mova operador de atribuição. Substitui o conteúdo com as de other usando semântica de movimento (ou seja, os dados em other é movido de other neste recipiente). other está em estado válido, mas não especificada depois.
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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Índice

[editar] Parâmetros

other -
um outro recipiente, para ser usado como fonte
Original:
another container to be used as source
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[editar] Valor de retorno

*this

[editar] Complexidade

1)
Linear no tamanho do recipiente.
Original:
Linear in the size of the container.
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2)
Constante.
Original:
Constant.
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[editar] Exemplo

O código a seguir usa para atribuir um std::unordered_map para outro:
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

[editar] Veja também

constrói o unordered_map
Original:
constructs the unordered_map
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(função pública membro) [edit]