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std::unordered_set::empty

De cppreference.com

 
 
 
std :: unordered_set
Les fonctions membres
Original:
Member functions
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unordered_set::unordered_set
unordered_set::~unordered_set
unordered_set::operator=
unordered_set::get_allocator
Les itérateurs
Original:
Iterators
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unordered_set::begin
unordered_set::cbegin
unordered_set::end
unordered_set::cend
Capacité
Original:
Capacity
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unordered_set::erase
unordered_set::size
unordered_set::max_size
Modificateurs
Original:
Modifiers
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unordered_set::clear
unordered_set::insert
unordered_set::emplace
unordered_set::emplace_hint
unordered_set::erase
unordered_set::swap
Lookup
Original:
Lookup
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unordered_set::count
unordered_set::find
unordered_set::equal_range
Interface seau
Original:
Bucket interface
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unordered_set::begin2
unordered_set::end2
unordered_set::bucket_count
unordered_set::max_bucket_count
unordered_set::bucket_size
unordered_set::bucket
Politique de hachage
Original:
Hash policy
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unordered_set::load_factor
unordered_set::max_load_factor
unordered_set::rehash
unordered_set::reserve
Des observateurs
Original:
Observers
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unordered_set::hash_function
unordered_set::key_eq
 
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

noexcept specification:  
noexcept
   (depuis C++11)

[modifier] Complexité

Constante
Original:
Constant
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[modifier] Exemple

Le code suivant utilise empty pour vérifier si un std::unordered_set<int> contient des éléments:
Original:
The following code uses empty to check if a std::unordered_set<int> contains any elements:
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#include <unordered_set>
#include <iostream>
 
int main()
{
    std::unordered_set<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
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(fonction membre publique) [edit]