std::array::back
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| reference back(); |
(dal C++11) | |
| const_reference back() const; |
(dal C++11) | |
Restituisce riferimento l'ultimo elemento nel contenitore.
Original:
Returns reference to the last element in the container.
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Chiamare
back su un contenitore vuoto non è definito.Original:
Calling
back on an empty container is undefined.The text has been machine-translated via Google Translate.
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Indice |
[modifica] Parametri
(Nessuno)
Original:
(none)
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[modifica] Valore di ritorno
riferimento all'ultimo elemento
Original:
reference to the last element
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[modifica] Complessità
Constant
Original:
Constant
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[modifica] Note
Per un
c contenitore, il return c.back(); espressione è equivalente a { 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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[modifica] Esempio
Il codice seguente utilizza
back per visualizzare l'ultimo elemento di una 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'; } }
Output:
The last character is f
[modifica] Vedi anche
| accedere al primo elemento Original: access the first element The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico) | |
