Namespace
Varianti

std::map::operator[]

Da cppreference.com.
< cpp‎ | container‎ | map

 
 
 
std::map
Membri funzioni
Original:
Member functions
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map::map
map::~map
map::operator=
map::get_allocator
Elemento accesso
Original:
Element access
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map::at
map::operator[]
Iteratori
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)
Capacità
Original:
Capacity
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map::empty
map::size
map::max_size
Modificatori
Original:
Modifiers
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map::clear
map::insert
map::emplace(C++11)
map::emplace_hint(C++11)
map::erase
map::swap
Lookup
Original:
Lookup
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map::count
map::find
map::equal_range
map::lower_bound
map::upper_bound
Osservatori
Original:
Observers
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map::key_comp
map::value_comp
 
T& operator[]( const Key& key );
(1)
T& operator[]( Key&& key );
(2) (dal C++11)
Inserisce un nuovo elemento al contenitore con key come chiave e predefinito al valore costruito mappato e restituisce un riferimento al valore di nuova costruzione mappati. Se un elemento con key chiave esiste già, non viene eseguita e l'inserimento di un riferimento al suo valore mappato viene restituito.
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)
Esegue sostanza (insert(std::make_pair(key, T())).first)->second.
Original:
Essentially performs (insert(std::make_pair(key, T())).first)->second.
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2)
Esegue sostanza (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.

Indice

[modifica] Parametri

key -
la chiave dell'elemento da trovare
Original:
the key of the element to find
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[modifica] Valore di ritorno

Riferimento al valore mappato del nuovo elemento se nessun elemento con chiave key esistito. Altrimenti un riferimento al valore mappato dell'elemento esistente viene restituito.
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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[modifica] Complessità

Logarithmic in the size of the container.

[modifica] Esempio

[modifica] Vedi anche

(C++11)
accedere elemento specificato con verifica dei limiti
Original:
access specified element with bounds checking
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(membro pubblico funzione) [edit]