Espaços nominais
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Acções

std::map::operator=

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< cpp‎ | container‎ | map

 
 
 
std::map
Funções de membro
Original:
Member functions
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map::map
map::~map
map::operator=
map::get_allocator
acesso. Elemento
Original:
Element access
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map::at
map::operator[]
Iteradores
Original:
Iterators
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map::begin
map::cbegin

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

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

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

(C++11)
Capacidade
Original:
Capacity
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map::empty
map::size
map::max_size
Modificadores
Original:
Modifiers
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map::clear
map::insert
map::emplace(C++11)
map::emplace_hint(C++11)
map::erase
map::swap
Pesquisa
Original:
Lookup
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map::count
map::find
map::equal_range
map::lower_bound
map::upper_bound
Observadores
Original:
Observers
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map::key_comp
map::value_comp
 
map& operator=( const map& other );
(1)
map& operator=( 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::map para outro:
Original:
The following code uses to assign one std::map to another:
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#include <map>
#include <iostream>
 
void display_sizes(const std::map<int, int> &nums1,
                   const std::map<int, int> &nums2,
                   const std::map<int, int> &nums3)
{
    std::cout << "nums1: " << nums1.size() 
              << " nums2: " << nums2.size()
              << " nums3: " << nums3.size() << '\n';
}
 
int main()
{
    std::map<int, int> nums1 {{3, 1}, {4, 1}, {5, 9}};
    std::map<int, int> nums2;
    std::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 map
Original:
constructs the map
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(função pública membro) [edit]