Namespace
Varianti

std::{{{1}}}::empty

Da cppreference.com.

bool empty() const;
(Senza contenitore - C + 11 funzione)
Original:
(no container - C++11 feature)
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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

noexcept specification:  
noexcept
  (dal C++11)

[modifica] Complessità

Constant
Original:
Constant
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[modifica] Esempio

Il codice seguente utilizza empty per controllare se un std::{{{1}}}<int> contiene elementi:
Original:
The following code uses empty to check if a std::{{{1}}}<int> contains any elements:
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#include <{{{1}}}>
#include <iostream>
 
int main()
{
    std::{{{1}}}<int> numbers;
    std::cout << "Initially, numbers.empty(): " << numbers.empty() << '\n';
 
    numbers.push_back(42);
    numbers.push_back(13317); 
    std::cout << "After adding elements, numbers.empty(): " << numbers.empty() << '\n';
}

Output:

Initially, numbers.empty(): 1
After adding elements, numbers.empty(): 0

See also

restituisce il numero di elementi
Original:
returns the number of elements
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(metodo pubblico) [modifica]