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std::map::operator[]

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< cpp‎ | container‎ | map

 
 
 
std::map
Les fonctions membres
Original:
Member functions
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map::map
map::~map
map::operator=
map::get_allocator
Elément d'accès
Original:
Element access
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map::at
map::operator[]
Les itérateurs
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)
Capacité
Original:
Capacity
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map::empty
map::size
map::max_size
Modificateurs
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
Des observateurs
Original:
Observers
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map::key_comp
map::value_comp
 
T& operator[]( const Key& key );
(1)
T& operator[]( Key&& key );
(2) (depuis C++11)
Insère un nouvel élément dans le récipient à l'aide key comme la clé par défaut et la valeur construite mappé et renvoie une référence à la valeur nouvellement construit mappé. Si un élément de key clé existe déjà, aucune insertion est effectuée et une référence à sa valeur mappée est retourné .
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)
Effectue essentiellement (insert(std::make_pair(key, T())).first)->second .
Original:
Essentially performs (insert(std::make_pair(key, T())).first)->second.
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2)
Effectue essentiellement (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.

Sommaire

[modifier] Paramètres

key -
la clé de l'élément à trouver
Original:
the key of the element to find
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[modifier] Retourne la valeur

Référence à la valeur de l'élément mappé nouveau si aucun élément avec la clé key existé. Sinon une référence à la valeur associée de l'élément actuel est retourné .
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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[modifier] Complexité

Logarithmic in the size of the container.

[modifier] Exemple

[modifier] Voir aussi

(C++11)
accéder à l'élément spécifié avec des limites de contrôle
Original:
access specified element with bounds checking
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(fonction membre publique) [edit]