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    std::map::operator[]

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    <metanoindex/>

     
    C++
     
    Contenitori libreria
     
    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
     
    <tbody> </tbody>
    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.

    Parametri

    key -
    la chiave dell'elemento da trovare
    Original:
    the key of the element to find
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    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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    Complessità

    Logarithmic in the size of the container.

    Esempio

    This section is incomplete
    Reason: no example

    Vedi anche

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