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std::forward_list::unique

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C++
 
Container-Bibliothek
 
std::forward_list
Member-Funktionen
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Member functions
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forward_list::forward_list
forward_list::~forward_list
forward_list::operator=
forward_list::assign
forward_list::get_allocator
Elementzugriff zerstört
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Element access
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forward_list::front
Iteratoren
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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
Kapazität
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Capacity
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forward_list::empty
forward_list::max_size
Modifiers
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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
Operations
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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) (seit C++11)
template< class BinaryPredicate >
void unique( BinaryPredicate p );
 (2) (seit C++11)
Entfernt alle aufeinander doppelte Elemente aus dem Behälter. Nur das erste Element in jeder Gruppe von Elementen gleich bleibt. Die erste Version verwendet operator== um die Elemente zu vergleichen, verwendet die zweite Version des gegebenen binären Prädikats 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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Inhaltsverzeichnis

[Bearbeiten] Parameter

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.

​

[Bearbeiten] Rückgabewert

(None)
Original:
(none)
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[Bearbeiten] Komplexität

Linear in der Größe des Behälters
Original:
Linear in the size of the container
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[Bearbeiten] Beispiel

#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

[Bearbeiten] Siehe auch

 removes consecutive duplicate elements in a range
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