Namespace
Varianti

std::forward_list::before_begin, std::forward_list::cbefore_begin

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
 
iterator before_begin();
(dal C++11)
const_iterator before_begin() const;
(dal C++11)
const_iterator cbefore_begin() const;
(dal C++11)
Ritorna un iteratore all'elemento prima del primo elemento del contenitore. Questo elemento funge da segnaposto, tentando di accedervi si traduce in un comportamento indefinito. I casi di utilizzo solo per quanto riguarda le funzioni di insert_after(), emplace_after(), erase_after(), splice_after() e l'operatore di incremento: l'incremento del prima-begin iteratore dà esattamente l'iteratore stesso ottenuto da begin() / cbegin().
Original:
Returns an iterator to the element before the first element of the container. This element acts as a placeholder, attempting to access it results in undefined behavior. The only usage cases are in functions insert_after(), emplace_after(), erase_after(), splice_after() and the increment operator: incrementing the before-begin iterator gives exactly the same iterator as obtained from begin()/cbegin().
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Indice

[modifica] Parametri

(Nessuno)
Original:
(none)
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[modifica] Valore di ritorno

iteratore all'elemento prima del primo elemento
Original:
iterator to the element before the first element
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[modifica] Eccezioni

1-3)
noexcept specification:  
noexcept
  (dal C++11)

[modifica] Complessità

Constant
Original:
Constant
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[modifica] Vedi anche

restituisce un iteratore all'inizio
Original:
returns an iterator to the beginning
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(membro pubblico funzione) [edit]
restituisce un iteratore fino alla fine
Original:
returns an iterator to the end
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(membro pubblico funzione) [edit]