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std::map::operator=

Da cppreference.com.
< cpp‎ | container‎ | map

 
 
 
std::map
Membri funzioni
Original:
Member functions
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map::map
map::~map
map::operator=
map::get_allocator
Elemento accesso
Original:
Element access
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map::at
map::operator[]
Iteratori
Original:
Iterators
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map::begin
map::cbegin

(C++11)
map::end
map::cend

(C++11)
map::rbegin
map::crbegin

(C++11)
map::rend
map::crend

(C++11)
Capacità
Original:
Capacity
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map::empty
map::size
map::max_size
Modificatori
Original:
Modifiers
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map::clear
map::insert
map::emplace(C++11)
map::emplace_hint(C++11)
map::erase
map::swap
Lookup
Original:
Lookup
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map::count
map::find
map::equal_range
map::lower_bound
map::upper_bound
Osservatori
Original:
Observers
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map::key_comp
map::value_comp
 
map& operator=( const map& other );
(1)
map& operator=( map&& other );
(2) (dal C++11)
Sostituisce il contenuto del contenitore.
Original:
Replaces the contents of the container.
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1)
Copia operatore di assegnazione. Sostituisce il contenuto con una copia del contenuto di other.
Original:
Copy assignment operator. Replaces the contents with a copy of the contents of other.
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2)
Spostare operatore di assegnazione. Sostituisce il contenuto con quelli della other usando la semantica spostamento (cioè i dati in other viene spostato da other in questo contenitore). other è in stato valido, ma non specificato in seguito.
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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Indice

[modifica] Parametri

other -
un altro contenitore per essere utilizzato come sorgente
Original:
another container to be used as source
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[modifica] Valore di ritorno

*this

[modifica] Complessità

1)
Lineare nella dimensione del contenitore.
Original:
Linear in the size of the container.
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2)
Costante.
Original:
Constant.
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[modifica] Esempio

Il codice seguente utilizza assegnare una std::map ad un altro:
Original:
The following code uses to assign one std::map to another:
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#include <map>
#include <iostream>
 
void display_sizes(const std::map<int, int> &nums1,
                   const std::map<int, int> &nums2,
                   const std::map<int, int> &nums3)
{
    std::cout << "nums1: " << nums1.size() 
              << " nums2: " << nums2.size()
              << " nums3: " << nums3.size() << '\n';
}
 
int main()
{
    std::map<int, int> nums1 {{3, 1}, {4, 1}, {5, 9}};
    std::map<int, int> nums2;
    std::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

[modifica] Vedi anche

costruisce il map
Original:
constructs the map
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(membro pubblico funzione) [edit]