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std::unordered_map::operator=

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
 
unordered_map& operator=( const unordered_map& other );
(1) (desde C++11)
unordered_map& operator=( unordered_map&& other );
(2) (desde C++11)
Reemplaza el contenido del recipiente .
Original:
Replaces the contents of the container.
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1)
Copiar el operador de asignación. Reemplaza el contenido con una copia de los contenidos de other .
Original:
Copy assignment operator. Replaces the contents with a copy of the contents of other.
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2)
Mueva operador de asignación. Reemplaza el contenido con los de other utilizando la semántica de movimiento (es decir, los datos de other se mueve de other en el envase). other está en estado válido, pero sin especificar después .
Original:
Move assignment operator. Replaces the contents with those of other using move semantics (i.e. the data in other is moved from other into this container). other is in valid, but unspecified state afterwards.
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Contenido

[editar] Parámetros

other -
otro recipiente para ser utilizado como fuente
Original:
another container to be used as source
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[editar] Valor de retorno

*this

[editar] Complejidad

1)
Lineal en el tamaño del recipiente .
Original:
Linear in the size of the container.
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2)
Constante .
Original:
Constant.
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[editar] Ejemplo

El código siguiente se utiliza para asignar un std::unordered_map a otro:
Original:
The following code uses to assign one std::unordered_map to another:
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#include <unordered_map>
#include <iostream>
 
void display_sizes(const std::unordered_map<int, int> &nums1,
                   const std::unordered_map<int, int> &nums2,
                   const std::unordered_map<int, int> &nums3)
{
    std::cout << "nums1: " << nums1.size() 
              << " nums2: " << nums2.size()
              << " nums3: " << nums3.size() << '\n';
}
 
int main()
{
    std::unordered_map<int, int> nums1 {{3, 1}, {4, 1}, {5, 9}};
    std::unordered_map<int, int> nums2;
    std::unordered_map<int, int> nums3;
 
    std::cout << "Initially:\n";
    display_sizes(nums1, nums2, nums3);
 
    // copy assignment copies data from nums1 to nums2
    nums2 = nums1;
 
    std::cout << "After assigment:\n"; 
    display_sizes(nums1, nums2, nums3);
 
    // move assignment moves data from nums1 to nums3,
    // modifying both nums1 and nums3
    nums3 = std::move(nums1);
 
    std::cout << "After move assigment:\n"; 
    display_sizes(nums1, nums2, nums3);
}

Output:

Initially:
nums1: 4 nums2: 0 nums3: 0
After assigment:
nums1: 4 nums2: 4 nums3: 0
After move assigment:
nums1: 0 nums2: 4 nums3: 4

[editar] Ver también

construye el unordered_map
Original:
constructs the unordered_map
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(miembro público función) [edit]