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std::deque::front

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< cpp‎ | container‎ | deque

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C++
 
Contenitori libreria
 
std :: deque
Membri funzioni
Original:
Member functions
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deque::deque
deque::~deque
deque::operator=
deque::assign
deque::get_allocator
Elemento accesso
Original:
Element access
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deque::front
deque::back
Iteratori
Original:
Iterators
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deque::begin
deque::cbegin
(C++11)
deque::end
deque::cend
(C++11)
deque::rbegin
deque::crbegin
(C++11)
deque::rend
deque::crend
(C++11)
Capacità
Original:
Capacity
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deque::empty
deque::size
deque::max_size
deque::shrink_to_fit
Modificatori
Original:
Modifiers
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deque::clear
deque::insert
deque::emplace
deque::erase
deque::push_front
deque::emplace_front
deque::pop_front
deque::push_back
deque::emplace_back
deque::pop_back
deque::resize
deque::swap
 
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::deque<char>:
Original:
The following code uses front to display the first element of a std::deque<char>:
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#include <deque>
#include <iostream>
 
int main()
{
    std::deque<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
(metodo pubblico) [modifica]
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