std::array::back

 

C++

Linguaggio

Concetti

Libreria di Utilità

Stringhe

Contenitori

Algoritmi

Iteratori

Libreria matematca

Input/output

Localizzazione

Espressioni regolari(C++11)

Operazioni atomicche(C++11)

Multithreading(C++11)

 

Contenitori libreria

array (C++11)

vector

deque

forward_list (C++11)

list

set

multiset

map

multimap

unordered_set (C++11)

unordered_multiset (C++11)

unordered_map (C++11)

unordered_multimap (C++11)

stack

queue

priority_queue

 

std::array

Membri funzioni Original: Member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Elemento accesso Original: Element access The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

array::at

array::operator[]

array::front

array::back

array::data

Iteratori Original: Iterators The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

array::begin array::cbegin

array::end array::cend

array::rbegin array::crbegin

array::rend array::crend

Capacità Original: Capacity The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

array::empty

array::size

array::max_size

Modificatori Original: Modifiers The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

array::fill

array::swap

Non membri funzioni Original: Non-member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

get

swap

Helper classi Original: Helper classes The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

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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Parametri

(Nessuno)

Original:

(none)

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Valore di ritorno

riferimento all'ultimo elemento

Original:

reference to the last element

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Complessità

Constant

Original:

Constant

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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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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

Vedi anche

front	accedere al primo elemento Original: access the first element The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico)