Namespace
Varianti

std::forward_list::unique

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
 
void unique();
(1) (dal C++11)
template< class BinaryPredicate >
void unique( BinaryPredicate p );
(2) (dal C++11)
Rimuove tutti gli elementi duplicati consecutivi' dal contenitore. Solo il primo elemento in ciascun gruppo di elementi uguali viene lasciato. La prima versione utilizza operator== di confrontare gli elementi, la seconda versione utilizza il predicato binario dato p.
Original:
Removes all consecutive duplicate elements from the container. Only the first element in each group of equal elements is left. The first version uses operator== to compare the elements, the second version uses the given binary predicate p.
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Indice

[modifica] Parametri

p - binary predicate which returns ​true if the elements should be treated as equal.

The signature of the predicate function should be equivalent to the following:

 bool pred(const Type1 &a, const Type2 &b);

The signature does not need to have const &, but the function must not modify the objects passed to it.
The types  Type1 and  Type2 must be such that an object of type forward_list<T,Allocator>::const_iterator can be dereferenced and then implicitly converted to both of them.

[modifica] Valore di ritorno

(Nessuno)
Original:
(none)
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[modifica] Complessità

Lineare nella dimensione del contenitore
Original:
Linear in the size of the container
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[modifica] Esempio

#include <iostream>
#include <forward_list>
 
int main()
{
  std::forward_list<int> x = {1, 2, 2, 3, 3, 2, 1, 1, 2};
 
  std::cout << "contents before:";
  for (auto val : x)
    std::cout << ' ' << val;
  std::cout << '\n';
 
  x.unique();
  std::cout << "contents after unique():";
  for (auto val : x)
    std::cout << ' ' << val;
  std::cout << '\n';
 
  return 0;
}

Output:

contents before: 1 2 2 3 3 2 1 1 2
contents after unique(): 1 2 3 2 1 2

[modifica] Vedi anche

removes consecutive duplicate elements in a range
(funzione di modello) [edit]