std::array::front
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| reference front(); |
(dal C++11) | |
| const_reference front() const; |
(dal C++11) | |
Restituisce un riferimento al primo elemento nel contenitore.
Original:
Returns a reference to the first element in the container.
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Chiamare
front su un contenitore vuoto non è definito.Original:
Calling
front on an empty container is undefined.The text has been machine-translated via Google Translate.
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Indice |
Parametri
(Nessuno)
Original:
(none)
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Valore di ritorno
riferimento al primo elemento
Original:
reference to the first element
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Complessità
Constant
Original:
Constant
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Note
Per un
c contenitore, il c.front() espressione è equivalente a *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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Esempio
Il codice seguente utilizza
front per visualizzare il primo elemento di 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'; } }
Output:
The first character is o
See also
| access the last element (metodo pubblico) | |
