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std::list::empty

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< cpp‎ | container‎ | list

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C++
 
Recipientes biblioteca
 
std::list
Funções de membro
Original:
Member functions
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list::list
list::~list
list::operator=
list::assign
list::get_allocator
acesso. Elemento
Original:
Element access
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list::front
list::back
Iteradores
Original:
Iterators
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list::begin
list::cbegin
(C++11)
list::end
list::cend
(C++11)
list::rbegin
list::crbegin
(C++11)
list::rend
list::crend
(C++11)
Capacidade
Original:
Capacity
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list::empty
list::size
list::max_size
Modificadores
Original:
Modifiers
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list::clear
list::insert
list::emplace(C++11)
list::erase
list::push_front
list::emplace_front(C++11)
list::pop_front
list::push_back
list::emplace_back(C++11)
list::pop_back
list::resize
list::swap
Operações
Original:
Operations
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list::merge
list::splice
list::remove
list::remove_if
list::reverse
list::unique
list::sort
 
bool empty() const;
Verifica se o recipiente não tem elementos, ou seja, se begin() == end().
Original:
Checks if the container has no elements, i.e. whether begin() == end().
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Índice

[editar] Parâmetros

(Nenhum)
Original:
(none)
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[editar] Valor de retorno

true se o recipiente estiver vazio, false contrário
Original:
true if the container is empty, false otherwise
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[editar] Exceções

noexcept specification:  
noexcept
  (desde C++11)

[editar] Complexidade

Constante
Original:
Constant
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[editar] Exemplo

O código a seguir usa empty para verificar se um std::list<int> contém quaisquer elementos:
Original:
The following code uses empty to check if a std::list<int> contains any elements:
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#include <list>
#include <iostream>
 
int main()
{
    std::list<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';
}

Saída: 

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

See also
devolve o número de elementos
Original:
returns the number of elements
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(função pública membro) [edit]
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