Algorithm - unique()

원형)

//기본형
template <class ForwardIterator>
  ForwardIterator unique (ForwardIterator first, ForwardIterator last);
 
//사용자 정의형
template <class ForwardIterator, class BinaryPredicate>
  ForwardIterator unique (ForwardIterator first, ForwardIterator last,
                          BinaryPredicate pred);

의미)

[Iterator first, Iterator last)범위에 있는 함수 중에서 동일한 값들을 제거합니다. 

소스)

#include<iostream>
#include<algorithm>
#include<vector>
 
void Print(const std::vector<int>& target)
{
    for (std::vector<int>::const_iterator iterPos = target.begin(); iterPos != target.cend(); iterPos++)
        std::cout << *iterPos << ' ';
    std::cout << std::endl;
}
 
void main()
{
    std::vector<int> vector = { 10,20,20,20,30,30,20,20,10 };
 
    std::cout << "Vector--->"; Print(vector);
    std::vector<int>::iterator iter = std::unique(vector.begin(), vector.end());
    vector.resize(std::distance(vector.begin(), iter));
    std::cout << "Vector --->"; Print(vector);
}

 리턴값)

삭제되지 않은 원소들의 마지막을 가리키는 Iterator를 리턴합니다.

결과)