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std::set::empty

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< cpp‎ | container‎ | set

 
 
 
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
 
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::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';
}

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]