std::array::empty
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| constexpr bool empty(); |
(dal C++11) | |
Controlla se il contenitore non ha elementi, vale a dire se begin() == end().
Original:
Checks if the container has no elements, i.e. whether begin() == end().
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Indice |
[modifica] Parametri
(Nessuno)
Original:
(none)
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[modifica] Valore di ritorno
true se il contenitore è vuoto, false altrimenti
Original:
true if the container is empty, false otherwise
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[modifica] Eccezioni
[modifica] Complessità
Constant
Original:
Constant
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[modifica] Esempio
Il codice seguente utilizza
empty per controllare se un std::array<int> contiene elementi:
Original:
The following code uses
empty to check if a std::array<int> contains any elements:
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#include <array> #include <iostream> int main() { std::array<int, 4> numbers {3, 1, 4, 1}; std::array<int, 0> no_numbers; std::cout << "numbers.empty(): " << numbers.empty() << '\n'; std::cout << "no_numbers.empty(): " << no_numbers.empty() << '\n'; }
Output:
numbers.empty(): 0 no_numbers.empty(): 1
See also
| restituisce il numero di elementi Original: returns the number of elements The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico) | |
