std::deque::empty - cppreference.com
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      std::deque::empty

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      <metanoindex/>

       
      C++
       
      Recipientes biblioteca
       
      std :: deque
      Funções de membro
      Original:
      Member functions
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      deque::deque
      deque::~deque
      deque::operator=
      deque::assign
      deque::get_allocator
      acesso. Elemento
      Original:
      Element access
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      deque::front
      deque::back
      Iteradores
      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)
      Capacidade
      Original:
      Capacity
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      deque::empty
      deque::size
      deque::max_size
      deque::shrink_to_fit
      Modificadores
      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
       
      <tbody> </tbody>
      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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      Parâmetros

      (Nenhum)
      Original:
      (none)
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      Valor de retorno

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

      noexcept specification:  
      <tbody> </tbody>
      noexcept
        (desde C++11)

      Complexidade

      Constante
      Original:
      Constant
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      Exemplo

      O código a seguir usa empty para verificar se um std::deque<int> contém quaisquer elementos:
      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';
}

      Saída: 

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

      See also