std::unordered_map::empty
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< cpp | container | unordered map
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| bool empty() const; |
(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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Sommaire |
[modifier] Paramètres
(Aucun)
Original:
(none)
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[modifier] Retourne la valeur
true si le récipient est vide, sinon false
Original:
true if the container is empty, false otherwise
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[modifier] Exceptions
[modifier] Complexité
Constante
Original:
Constant
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[modifier] Exemple
Le code suivant utilise
empty pour vérifier si un std::unordered_map<int> contient des éléments:
Original:
The following code uses
empty to check if a std::unordered_map<int> contains any elements:
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#include <unordered_map> #include <iostream> int main() { std::unordered_map<int> numbers; std::cout << "Initially, numbers.empty(): " << numbers.empty() << '\n'; numbers.push_back(42); numbers.push_back(13317); std::cout << "After adding elements, numbers.empty(): " << numbers.empty() << '\n'; }
Résultat :
Initially, numbers.empty(): 1 After adding elements, numbers.empty(): 0
See also
| 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) | |
