Namespace
Varianti

std::set::empty

Da cppreference.com.
< cpp‎ | container‎ | set

[edit template]

Questa pagina è stata tradotta in modo automatico dalla versione in ineglese della wiki usando Google Translate.

La traduzione potrebbe contenere errori e termini strani. Muovi il puntatore sopra al testo per vedere la versione originale. Puoi aiutarci a correggere gli gli errori. Per ulteriori istruzioni clicca qui.

Click here for the English version of this page

 
C++
 
Contenitori libreria
 
std::set
Membri funzioni
Original:
Member functions
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
set::set
set::~set
set::operator=
set::get_allocator
Iteratori
Original:
Iterators
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
set::begin
set::cbegin
(C++11)
set::end
set::cend
(C++11)
set::rbegin
set::crbegin
(C++11)
set::rend
set::crend
(C++11)
Capacità
Original:
Capacity
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
set::empty
set::size
set::max_size
Modificatori
Original:
Modifiers
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
set::clear
set::insert
set::emplace(C++11)
set::emplace_hint(C++11)
set::erase
set::swap
Lookup
Original:
Lookup
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
set::count
set::find
set::equal_range
set::lower_bound
set::upper_bound
Osservatori
Original:
Observers
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
set::key_comp
set::value_comp
 
bool empty() const;
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().
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

Indice

[modifica] Parametri

(Nessuno)
Original:
(none)
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

[modifica] Valore di ritorno

true se il contenitore è vuoto, false altrimenti
Original:
true if the container is empty, false otherwise
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

[modifica] Eccezioni

noexcept specification:  
noexcept
  (dal C++11)

[modifica] Complessità

Constant
Original:
Constant
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

[modifica] Esempio

Il codice seguente utilizza empty per controllare se un std::set<int> contiene elementi:
Original:
The following code uses empty to check if a std::set<int> contains any elements:
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

#include <set>
#include <iostream>
 
int main()
{
    std::set<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
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(metodo pubblico) [modifica]
Estratto da "https://it.cppreference.com/mwiki/index.php?title=cpp/container/set/empty&oldid=25342"