Namespace
Varianti

std::forward_list::front

Da cppreference.com.

 
 
 
std::forward_list
Membri funzioni
Original:
Member functions
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forward_list::forward_list
forward_list::~forward_list
forward_list::operator=
forward_list::assign
forward_list::get_allocator
Elemento accesso
Original:
Element access
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forward_list::front
Iteratori
Original:
Iterators
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forward_list::before_begin
forward_list::cbefore_begin
forward_list::begin
forward_list::cbegin
forward_list::end
forward_list::cend
Capacità
Original:
Capacity
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forward_list::empty
forward_list::max_size
Modificatori
Original:
Modifiers
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forward_list::clear
forward_list::insert_after
forward_list::emplace_after
forward_list::erase_after
forward_list::push_front
forward_list::emplace_front
forward_list::pop_front
forward_list::resize
forward_list::swap
Operazioni
Original:
Operations
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forward_list::merge
forward_list::splice_after
forward_list::remove
forward_list::remove_if
forward_list::reverse
forward_list::unique
forward_list::sort
 
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::forward_list<char>:
Original:
The following code uses front to display the first element of a std::forward_list<char>:
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#include <forward_list>
#include <iostream>
 
int main()
{
    std::forward_list<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

None