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std::array::front

De cppreference.com
< cpp‎ | container‎ | array

 
 
 
std::array
Les fonctions membres
Original:
Member functions
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Elément d'accès
Original:
Element access
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array::at
array::operator[]
array::front
array::back
array::data
Les itérateurs
Original:
Iterators
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array::begin
array::cbegin
array::end
array::cend
array::rbegin
array::crbegin
array::rend
array::crend
Capacité
Original:
Capacity
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array::empty
array::size
array::max_size
Modificateurs
Original:
Modifiers
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array::fill
array::swap
Tiers fonctions
Original:
Non-member functions
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get
swap
Classes d'aide
Original:
Helper classes
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tuple_size
tuple_element
 
reference front();
(depuis C++11)
const_reference front() const;
(depuis C++11)
Renvoie une référence au premier élément dans le conteneur .
Original:
Returns a reference to the first element in the container.
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Appel front sur un contenant vide est indéfini .
Original:
Calling front on an empty container is undefined.
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Sommaire

[modifier] Paramètres

(Aucun)
Original:
(none)
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[modifier] Retourne la valeur

référence au premier élément
Original:
reference to the first element
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[modifier] Complexité

Constante
Original:
Constant
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[modifier] Notes

Pour une c conteneur, le c.front() expression est équivalente à *c.begin() .
Original:
For a container c, the expression c.front() is equivalent to *c.begin().
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[modifier] Exemple

Le code suivant utilise front pour afficher le premier élément d'un std::array<char>:
Original:
The following code uses front to display the first element of a std::array<char>:
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#include <array>
#include <iostream>
 
int main()
{
    std::array<char> letters {'o', 'm', 'g', 'w', 't', 'f'};
 
    if (!letters.empty()) {
        std::cout << "The first character is: " << letters.front() << '\n';
    }  
}

Résultat :

The first character is o

See also

accéder au dernier élément
Original:
access the last element
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(fonction membre publique) [edit]