Namespace
Varianti

std::array::back

Da cppreference.com.
< cpp‎ | container‎ | array

 
 
 
std::array
Membri funzioni
Original:
Member functions
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Elemento accesso
Original:
Element access
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array::at
array::operator[]
array::front
array::back
array::data
Iteratori
Original:
Iterators
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array::begin
array::cbegin
array::end
array::cend
array::rbegin
array::crbegin
array::rend
array::crend
Capacità
Original:
Capacity
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array::empty
array::size
array::max_size
Modificatori
Original:
Modifiers
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array::fill
array::swap
Non membri funzioni
Original:
Non-member functions
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get
swap
Helper classi
Original:
Helper classes
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tuple_size
tuple_element
 
reference back();
(dal C++11)
const_reference back() const;
(dal C++11)
Restituisce riferimento l'ultimo elemento nel contenitore.
Original:
Returns reference to the last element in the container.
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Chiamare back su un contenitore vuoto non è definito.
Original:
Calling back on an empty container is undefined.
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Indice

[modifica] Parametri

(Nessuno)
Original:
(none)
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[modifica] Valore di ritorno

riferimento all'ultimo elemento
Original:
reference to the last element
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[modifica] Complessità

Constant
Original:
Constant
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[modifica] Note

Per un c contenitore, il return c.back(); espressione è equivalente a { auto tmp = c.end(); --tmp; return *tmp; }
Original:
For a container c, the expression return c.back(); is equivalent to { auto tmp = c.end(); --tmp; return *tmp; }
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[modifica] Esempio

Il codice seguente utilizza back per visualizzare l'ultimo elemento di una std::array<char>:
Original:
The following code uses back to display the last element of a std::array<char>:
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#include <array>
#include <iostream>
 
int main()
{
    std::array<char> letters {'o', 'm', 'g', 'w', 't', 'f'};
 
    if (!letters.empty()) {
        std::cout << "The last character is: " << letters.back() << '\n';
    }  
}

Output:

The last character is f

[modifica] Vedi anche

accedere al primo elemento
Original:
access the first element
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(membro pubblico funzione) [edit]