Namespace
Varianti

std::array::front

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 front();
(dal C++11)
const_reference front() const;
(dal C++11)
Restituisce un riferimento al primo elemento nel contenitore.
Original:
Returns a reference to the first element in the container.
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Chiamare front su un contenitore vuoto non è definito.
Original:
Calling front 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 al primo elemento
Original:
reference to the first element
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[modifica] Complessità

Constant
Original:
Constant
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[modifica] Note

Per un c contenitore, il c.front() espressione è equivalente a *c.begin().
Original:
For a container c, the expression c.front() is equivalent to *c.begin().
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[modifica] Esempio

Il codice seguente utilizza front per visualizzare il primo elemento di un std::array<char>:
Original:
The following code uses front to display the first 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 first character is: " << letters.front() << '\n';
    }  
}

Output:

The first character is o

See also

access the last element
(membro pubblico funzione) [edit]