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std::unique

提供: cppreference.com
< cpp‎ | algorithm

 
 
アルゴリズムライブラリ
機能します
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Functions
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シーケンス動作を非改変
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Non-modifying sequence operations
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シーケンス動作を変更する
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Modifying sequence operations
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操作を仕切る
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Partitioning operations
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(ソートされた範囲で)ソート操作
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Sorting operations (on sorted ranges)
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バイナリ検索操作(ソート範囲で)
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Binary search operations (on sorted ranges)
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(ソートされた範囲で)操作を設定します
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Set operations (on sorted ranges)
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ヒープ操作
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Heap operations
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最小値/最大値操作
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Minimum/maximum operations
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数値演算
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Numeric operations
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Cライブラリ
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C library
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Defined in header <algorithm>
template<class ForwardIt >
ForwardIt unique( ForwardIt first, ForwardIt last );
(1)
template<class ForwardIt, class BinaryPredicate >
ForwardIt unique( ForwardIt first, ForwardIt last, BinaryPredicate p );
(2)
レンジ[first, last)からすべての連続した​​重複した要素を削除します。取り外しが消去される要素が上書きされないように、必要なときに範囲をシフトすることによって行われます。等しい要素の各グループ内の最初の要素だけが残っている。古いものと新しいものの端部または範囲の間の要素はそのまま残されます。最初のバージョンは、要素を比較するoperator==使用して、2番目のバージョンは、指定されたバイナリ述語pを使用しています.
Original:
Removes all consecutive duplicate elements from the range [first, last). Removing is done by shifting the range when needed in such a way that elements to be erased are overwritten. Only the first element in each group of equal elements is left. The elements between the old and the new end or the range are left intact. The first version uses operator== to compare the elements, the second version uses the given binary predicate p.
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目次

[編集]パラメータ

first, last -
プロセスへの要素の範囲
Original:
the range of elements to process
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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 ForwardIt can be dereferenced and then implicitly converted to both of them.

型の要件
-
ForwardItForwardIterator

の要求を満足しなければなりません。

-
The type of dereferenced ForwardIt must meet the requirements of MoveAssignable.

[編集]値を返します

範囲の新しいエンドにフォワードイテレータ
Original:
Forward iterator to the new end of the range
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[編集]可能な実装

First version
template<class ForwardIt> ForwardIt unique(ForwardIt first, ForwardIt last){if(first == last)return last;   ForwardIt result = first;while(++first != last){if(!(*result ==*first)){*(++result)=*first;}}return++result;}
Second version
template<class ForwardIt, class BinaryPredicate> ForwardIt unique(ForwardIt first, ForwardIt last, BinaryPredicate p){if(first == last)return last;   ForwardIt result = first;while(++first != last){if(!p(*result, *first)){*(++result)=*first;}}return++result;}

[編集]

次のコードは、整数のベクトルからのすべての連続した​​同等の要素を削除します.
Original:
The following code removes all consecutive equivalent elements from a vector of integers.
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#include <iostream>#include <algorithm>#include <vector>   int main(){std::vector<int> v{1, 2, 2, 2, 3, 3, 2, 2, 1};std::vector<int>::iterator last;   last = std::unique(v.begin(), v.end());// 1 2 3 2 1 3 2 2 1// ^for(std::vector<int>::iterator it = v.begin(); it != last;++it){std::cout<<*it <<" ";}std::cout<<"\n";}

出力:

1 2 3 2 1

[編集]複雑性

firstlastとの間の距離の線形
Original:
linear in the distance between first and last
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[編集]参照

互いに隣接する2つの同一の(またはいくつかの他の関係)のアイテムを見つけることができます
Original:
finds two identical (or some other relationship) items adjacent to each other
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(関数テンプレート)[edit]
全く連続した重複を含まない要素のいくつか範囲のコピーを作成します
Original:
creates a copy of some range of elements that contains no consecutive duplicates
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(関数テンプレート)[edit]
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