Namespace
Varianti

std::list::front

Da cppreference.com.
< cpp‎ | container‎ | list

 
 
 
std::list
Membri funzioni
Original:
Member functions
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list::list
list::~list
list::operator=
list::assign
list::get_allocator
Elemento accesso
Original:
Element access
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list::front
list::back
Iteratori
Original:
Iterators
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list::begin
list::cbegin

(C++11)
list::end
list::cend

(C++11)
list::rbegin
list::crbegin

(C++11)
list::rend
list::crend

(C++11)
Capacità
Original:
Capacity
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list::empty
list::size
list::max_size
Modificatori
Original:
Modifiers
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list::clear
list::insert
list::emplace(C++11)
list::erase
list::push_front
list::emplace_front(C++11)
list::pop_front
list::push_back
list::emplace_back(C++11)
list::pop_back
list::resize
list::swap
Operazioni
Original:
Operations
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list::merge
list::splice
list::remove
list::remove_if
list::reverse
list::unique
list::sort
 
reference front();
const_reference front() const;
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::list<char>:
Original:
The following code uses front to display the first element of a std::list<char>:
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#include <list>
#include <iostream>
 
int main()
{
    std::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

See also

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