Namespace
Varianti

std::vector::operator[]

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< cpp‎ | container‎ | vector

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C++
 
Contenitori libreria
 
std::vector
Membri funzioni
Original:
Member functions
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vector::vector
vector::~vector
vector::operator=
vector::assign
vector::get_allocator
Elemento accesso
Original:
Element access
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vector::at
vector::operator[]
vector::front
vector::back
vector::data(C++11)
Iteratori
Original:
Iterators
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vector::begin
vector::cbegin
(C++11)
vector::end
vector::cend
(C++11)
vector::rbegin
vector::crbegin
(C++11)
vector::rend
vector::crend
(C++11)
Capacità
Original:
Capacity
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vector::empty
vector::size
vector::max_size
vector::reserve
vector::capacity
vector::shrink_to_fit(C++11)
Modificatori
Original:
Modifiers
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vector::clear
vector::insert
vector::emplace(C++11)
vector::erase
vector::push_back
vector::emplace_back(C++11)
vector::pop_back
vector::resize
vector::swap
 
reference       operator[]( size_type pos );
const_reference operator[]( size_type pos ) const;
Restituisce un riferimento per l'elemento in pos posizione specificata. Nessun controllo dei limiti viene eseguito.
Original:
Returns a reference to the element at specified location pos. No bounds checking is performed.
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Indice

[modifica] Parametri

pos -
posizione dell'elemento di ritornare
Original:
position of the element to return
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[modifica] Valore di ritorno

riferimento per l'elemento richiesto
Original:
reference to the requested element
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[modifica] Complessità

Constant
Original:
Constant
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[modifica] Esempio

Il codice seguente utilizza operator[] leggere e scrivere in un std::vector<int>:
Original:
The following code uses operator[] read from and write to a std::vector<int>:
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#include <vector>
#include <iostream>
 
int main()
{
    std::vector<int> numbers {2, 4, 6, 8};
 
    std::cout << "Second element: " << numbers[1] << '\n';
 
    numbers[0] = 5;
 
    std::cout << "All numbers:";
    for (auto i : numbers) {
        std::cout << ' ' << i;
    }
    std::cout << '\n';
}

Output: 

Second element: 4
All numbers: 5 4 6 8

[modifica] Vedi anche
accedere elemento specificato con verifica dei limiti
Original:
access specified element with bounds checking
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(metodo pubblico) [modifica]
Estratto da "https://it.cppreference.com/mwiki/index.php?title=cpp/container/vector/operator_at&oldid=25521"