Namespace
Varianti

std::deque::empty

Da cppreference.com.
< cpp‎ | container‎ | deque

 
 
 
std :: deque
Membri funzioni
Original:
Member functions
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deque::deque
deque::~deque
deque::operator=
deque::assign
deque::get_allocator
Elemento accesso
Original:
Element access
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deque::front
deque::back
Iteratori
Original:
Iterators
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deque::begin
deque::cbegin

(C++11)
deque::end
deque::cend

(C++11)
deque::rbegin
deque::crbegin

(C++11)
deque::rend
deque::crend

(C++11)
Capacità
Original:
Capacity
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deque::empty
deque::size
deque::max_size
deque::shrink_to_fit
Modificatori
Original:
Modifiers
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deque::clear
deque::insert
deque::emplace
deque::erase
deque::push_front
deque::emplace_front
deque::pop_front
deque::push_back
deque::emplace_back
deque::pop_back
deque::resize
deque::swap
 
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().
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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::deque<int> contiene elementi:
Original:
The following code uses empty to check if a std::deque<int> contains any elements:
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#include <deque>
#include <iostream>
 
int main()
{
    std::deque<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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(membro pubblico funzione) [edit]