Varianti

    std::deque::front

    Da cppreference.com.

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    <metanoindex/>

     
    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
     
    <tbody> </tbody>
    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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    Parametri

    (Nessuno)
    Original:
    (none)
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    Valore di ritorno

    riferimento al primo elemento
    Original:
    reference to the first element
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    Complessità

    Constant
    Original:
    Constant
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    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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    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]