std::array::front
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| 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.The text has been machine-translated via Google Translate.
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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().The text has been machine-translated via Google Translate.
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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
| accède au dernier élément (fonction membre publique) | |
