std::array::empty
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<metanoindex/>
<tbody> </tbody> constexpr bool empty(); |
(depuis C++11) | |
Vrifie si le conteneur n'a pas d'lments, savoir si
begin() == end() .Original:
Checks if the container has no elements, i.e. whether
begin() == end().The text has been machine-translated via Google Translate.
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Paramtres
(Aucun)
Original:
(none)
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Retourne la valeur
true si le rcipient est vide, sinon falseOriginal:
true if the container is empty, false otherwiseThe text has been machine-translated via Google Translate.
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Exceptions
Complexit
Constante
Original:
Constant
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Exemple
Le code suivant utilise
empty pour vrifier si un std::array<int> contient des lments:
Original:
The following code uses
empty to check if a std::array<int> contains any elements:
The text has been machine-translated via Google Translate.
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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';
}
Rsultat :
numbers.empty(): 0
no_numbers.empty(): 1
See also
retourne le nombre d'lments 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) | |