std::array::empty

 

C++

Langage

Concepts

Bibliothèque d'utilitaires

Bibliothèque pour les chaînes de caractères

Bibliothèque de conteneurs

Bibliothèque d'algorithmes

Bibliothèque d'itérateurs

Bibliothèque pour le calcul numérique

Bibliothèque pour les entrées/sorties

Bibliothèque pour la régionalisation

Bibliothèque pour les expressions régulières (C++11)

Bibliothèque pour les opérations atomiques (C++11)

Bibliothèque pour les processus légers (threads) (C++11)

 

Bibliothèque de conteneurs

array (C++11)

vector

deque

forward_list (C++11)

list

set

multiset

map

multimap

unordered_set (C++11)

unordered_multiset (C++11)

unordered_map (C++11)

unordered_multimap (C++11)

stack

queue

priority_queue

 

std::array

Les fonctions membres Original: Member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Elément d'accès Original: Element access The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

array::at

array::operator[]

array::front

array::back

array::data

Les itérateurs Original: Iterators The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

array::begin array::cbegin

array::end array::cend

array::rbegin array::crbegin

array::rend array::crend

Capacité Original: Capacity The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

array::empty

array::size

array::max_size

Modificateurs Original: Modifiers The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

array::fill

array::swap

Tiers fonctions Original: Non-member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

get

swap

Classes d'aide Original: Helper classes The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

tuple_size

tuple_element

 

constexprbool empty();		(depuis C++11)

Vérifie si le conteneur n'a pas d'éléments, à savoir si begin()== end() .

Original:

Checks if the container has no elements, i.e. whether begin()== end().

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Paramètres

(Aucun)

Original:

(none)

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Retourne la valeur

true si le récipient est vide, sinon false

Original:

true if the container is empty, false otherwise

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Exceptions

noexcept specification:  

noexcept

   (depuis C++11)

Complexité

Constante

Original:

Constant

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Exemple

Le code suivant utilise empty pour vérifier si un std::array<int> contient des éléments:

Original:

The following code uses empty to check if a std::array<int> contains any elements:

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#include <array>#include <iostream>   int main(){std::array<int, 4> numbers {3, 1, 4, 1};std::array<int, 0> no_numbers;   std::cout<<"numbers.empty(): "<< numbers.empty()<<'\n';std::cout<<"no_numbers.empty(): "<< no_numbers.empty()<<'\n';}

Résultat :

numbers.empty(): 0 no_numbers.empty(): 1

See also

size	retourne le nombre d'éléments Original: returns the number of elements The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction membre publique)