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std::set::empty

De cppreference.com
< cpp‎ | container‎ | set

 
 
 
std::set
Les fonctions membres
Original:
Member functions
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set::set
set::~set
set::operator=
set::get_allocator
Les itérateurs
Original:
Iterators
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set::begin
set::cbegin

(C++11)
set::end
set::cend

(C++11)
set::rbegin
set::crbegin

(C++11)
set::rend
set::crend

(C++11)
Capacité
Original:
Capacity
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set::empty
set::size
set::max_size
Modificateurs
Original:
Modifiers
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set::clear
set::insert
set::emplace (C++11)
set::emplace_hint (C++11)
set::erase
set::swap
Lookup
Original:
Lookup
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set::count
set::find
set::equal_range
set::lower_bound
set::upper_bound
Des observateurs
Original:
Observers
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set::key_comp
set::value_comp
 
bool empty() const;
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::set<int> contient des éléments:
Original:
The following code uses empty to check if a std::set<int> contains any elements:
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#include <set>
#include <iostream>
 
int main()
{
    std::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]