std::array::empty

 

C++

Linguaggio

Concetti

Libreria di Utilità

Stringhe

Contenitori

Algoritmi

Iteratori

Libreria matematca

Input/output

Localizzazione

Espressioni regolari(C++11)

Operazioni atomicche(C++11)

Multithreading(C++11)

 

Contenitori libreria

array (C++11)

vector

deque

forward_list (C++11)

list

set

multiset

map

multimap

unordered_set (C++11)

unordered_multiset (C++11)

unordered_map (C++11)

unordered_multimap (C++11)

stack

queue

priority_queue

 

std::array

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.

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

array::at

array::operator[]

array::front

array::back

array::data

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.

array::begin array::cbegin

array::end array::cend

array::rbegin array::crbegin

array::rend array::crend

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.

array::empty

array::size

array::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.

array::fill

array::swap

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

get

swap

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

tuple_size

tuple_element

 

constexprbool 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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Parametri

(Nessuno)

Original:

(none)

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Valore di ritorno

true se il contenitore è vuoto, false altrimenti

Original:

true if the container is empty, false otherwise

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Eccezioni

noexcept specification:  

noexcept

  (dal C++11)

Complessità

Constant

Original:

Constant

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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

size	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)