std::array::back
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<metanoindex/>
<tbody> </tbody> reference back(); |
(depuis C++11) | |
const_reference back() const; |
(depuis C++11) | |
Retourne rfrence au dernier lment dans le conteneur .
Original:
Returns reference to the last element in the container.
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Appel
back sur un contenant vide est indfini .Original:
Calling
back 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 dernier lment
Original:
reference to the last element
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Complexit
Constante
Original:
Constant
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Notes
Pour une
c conteneur, le return c.back(); expression est quivalente { auto tmp = c.end(); --tmp; return *tmp; }Original:
For a container
c, the expression return c.back(); is equivalent to { auto tmp = c.end(); --tmp; return *tmp; }The text has been machine-translated via Google Translate.
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Exemple
Le code suivant utilise
back pour afficher le dernier lment d'une std::array<char>:
Original:
The following code uses
back to display the last 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 last character is: " << letters.back() << '\n';
}
}
Rsultat :
The last character is f
Voir aussi
| accde au premier lment (fonction membre publique) | |