Varianti

    std::forward_list::front

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    <metanoindex/>

     
    C++
     
    Contenitori libreria
     
    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
     
    <tbody> </tbody>
    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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    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::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