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std::array::empty

Da cppreference.com
< cpp‎ | container‎ | array

 
 
 
std::array
Funções de membro
Original:
Member functions
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acesso. Elemento
Original:
Element access
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array::at
array::operator[]
array::front
array::back
array::data
Iteradores
Original:
Iterators
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array::begin
array::cbegin
array::end
array::cend
array::rbegin
array::crbegin
array::rend
array::crend
Capacidade
Original:
Capacity
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array::empty
array::size
array::max_size
Modificadores
Original:
Modifiers
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array::fill
array::swap
Não-membros funções
Original:
Non-member functions
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get
swap
Classes auxiliares
Original:
Helper classes
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tuple_size
tuple_element
 
constexpr bool empty();
(a partir do C++ 11)
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
  (a partir do C++ 11)

[editar] Complexidade

Constante
Original:
Constant
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[editar] Exemplo

O código a seguir usa empty para verificar se um std::array<int> contém quaisquer elementos:
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

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