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std::unordered_map::empty

De cppreference.com

 
 
 
std::unordered_map
Las funciones miembro
Original:
Member functions
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unordered_map::unordered_map
unordered_map::~unordered_map
unordered_map::operator=
unordered_map::get_allocator
Los iteradores
Original:
Iterators
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unordered_map::begin
unordered_map::cbegin
unordered_map::end
unordered_map::cend
Capacidad
Original:
Capacity
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unordered_map::erase
unordered_map::size
unordered_map::max_size
Modificadores
Original:
Modifiers
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unordered_map::clear
unordered_map::insert
unordered_map::emplace
unordered_map::emplace_hint
unordered_map::erase
unordered_map::swap
Buscar
Original:
Lookup
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unordered_map::count
unordered_map::find
unordered_map::equal_range
Bucket interfaz
Original:
Bucket interface
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unordered_map::begin2
unordered_map::end2
unordered_map::bucket_count
unordered_map::max_bucket_count
unordered_map::bucket_size
unordered_map::bucket
Política Hash
Original:
Hash policy
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unordered_map::load_factor
unordered_map::max_load_factor
unordered_map::rehash
unordered_map::reserve
Los observadores
Original:
Observers
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unordered_map::hash_function
unordered_map::key_eq
 
bool empty() const;
(desde C++11)
Comprueba si el contenedor no tiene elementos, es decir, si begin() == end() .
Original:
Checks if the container has no elements, i.e. whether begin() == end().
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Contenido

[editar] Parámetros

(Ninguno)
Original:
(none)
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[editar] Valor de retorno

true si el recipiente está vacío, false lo contrario
Original:
true if the container is empty, false otherwise
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[editar] Excepciones

noexcept specification:  
noexcept
  (desde C++11)

[editar] Complejidad

Constant
Original:
Constant
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[editar] Ejemplo

El código siguiente utiliza empty para comprobar si un std::unordered_map<int> contiene elementos:
Original:
The following code uses empty to check if a std::unordered_map<int> contains any elements:
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#include <unordered_map>
#include <iostream>
 
int main()
{
    std::unordered_map<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

devuelve el número de elementos
Original:
returns the number of elements
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(miembro público función) [edit]