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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
 
T& operator[]( const Key& key );
(1)
T& operator[]( Key&& key );
(2) (a partir do C++ 11)
Insere um novo elemento para o recipiente utilizando key como a chave padrão e valor calculado mapeada e retorna uma referência para o valor recém-construído mapeados. Se um elemento com key chave já existe, não é realizada de inserção e uma referência ao seu valor mapeado é devolvido.
Original:
Inserts a new element to the container using key as the key and default constructed mapped value and returns a reference to the newly constructed mapped value. If an element with key key already exists, no insertion is performed and a reference to its mapped value is returned.
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1)
Executa essencialmente (insert(std::make_pair(key, T())).first)->second.
Original:
Essentially performs (insert(std::make_pair(key, T())).first)->second.
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2)
Executa essencialmente (insert(std::make_pair(std::move(key), T())).first)->second.
Original:
Essentially performs (insert(std::make_pair(std::move(key), T())).first)->second.
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No iterators or references are invalidated.

Índice

[editar] Parâmetros

key -
a chave do elemento de encontrar
Original:
the key of the element to find
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[editar] Valor de retorno

Referência ao valor mapeada do elemento novo se nenhum elemento com chave key existiu. Caso contrário, uma referência ao valor do elemento mapeada existente é retornado.
Original:
Reference to the mapped value of the new element if no element with key key existed. Otherwise a reference to the mapped value of the existing element is returned.
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[editar] Complexidade

Logarithmic in the size of the container.

[editar] Exemplo

[editar] Veja também

(C++11)
acessar o elemento especificado com verificação de limites
Original:
access specified element with bounds checking
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(função pública membro) [edit]