std::unique
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ヘッダ <algorithm> で定義 | ||
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
.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
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. |
型の要件 | ||
-ForwardIt は ForwardIterator 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]例
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
first
last
との間の距離の線形Original:
linear in the distance between
first
and last
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
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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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (関数テンプレート) | |
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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (関数テンプレート) |