std::array::front
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<metanoindex/>
<tbody> </tbody> reference front(); |
(depuis C++11) | |
const_reference front() const; |
(depuis C++11) | |
Renvoie une rfrence au premier lment 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 indfini .Original:
Calling
front on an empty container is undefined.The text has been machine-translated via Google Translate.
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Paramtres
(Aucun)
Original:
(none)
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Retourne la valeur
rfrence au premier lment
Original:
reference to the first element
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Complexit
Constante
Original:
Constant
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Notes
Pour une
c conteneur, le c.front() expression est quivalente *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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Exemple
Le code suivant utilise
front pour afficher le premier lment 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';
}
}
Rsultat :
The first character is o
See also
| accde au dernier lment (fonction membre publique) | |