std::set::empty - cppreference.com
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      std::set::empty

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      <metanoindex/>

       
      C++
       
      Recipientes biblioteca
       
      std::set
      Funções de membro
      Original:
      Member functions
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      set::set
      set::~set
      set::operator=
      set::get_allocator
      Iteradores
      Original:
      Iterators
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      set::begin
      set::cbegin
      (C++11)
      set::end
      set::cend
      (C++11)
      set::rbegin
      set::crbegin
      (C++11)
      set::rend
      set::crend
      (C++11)
      Capacidade
      Original:
      Capacity
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      set::empty
      set::size
      set::max_size
      Modificadores
      Original:
      Modifiers
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      set::clear
      set::insert
      set::emplace(C++11)
      set::emplace_hint(C++11)
      set::erase
      set::swap
      Pesquisa
      Original:
      Lookup
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      set::count
      set::find
      set::equal_range
      set::lower_bound
      set::upper_bound
      Observadores
      Original:
      Observers
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      set::key_comp
      set::value_comp
       
      <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::set<int> contém quaisquer elementos:
      Original:
      The following code uses empty to check if a std::set<int> contains any elements:
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      #include <set>
#include <iostream>
 
int main()
{
    std::set<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