Espaços nominais
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std::vector::empty

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< cpp‎ | container‎ | vector

 
 
 
std::vector
Funções de membro
Original:
Member functions
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vector::vector
vector::~vector
vector::operator=
vector::assign
vector::get_allocator
acesso. Elemento
Original:
Element access
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vector::at
vector::operator[]
vector::front
vector::back
vector::data(C++11)
Iteradores
Original:
Iterators
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vector::begin
vector::cbegin

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

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

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

(C++11)
Capacidade
Original:
Capacity
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vector::empty
vector::size
vector::max_size
vector::reserve
vector::capacity
vector::shrink_to_fit(C++11)
Modificadores
Original:
Modifiers
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vector::clear
vector::insert
vector::emplace(C++11)
vector::erase
vector::push_back
vector::emplace_back(C++11)
vector::pop_back
vector::resize
vector::swap
 
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
  (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::vector<int> contém quaisquer elementos:
Original:
The following code uses empty to check if a std::vector<int> contains any elements:
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#include <vector>
#include <iostream>
 
int main()
{
    std::vector<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

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