std::find_end
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ヘッダ <algorithm> で定義 | ||
template<class ForwardIt1, class ForwardIt2 > ForwardIt1 find_end( ForwardIt1 first, ForwardIt1 last, | (1) | |
template<class ForwardIt1, class ForwardIt2, class BinaryPredicate > ForwardIt1 find_end( ForwardIt1 first, ForwardIt1 last, | (2) | |
要素の最後のサブシーケンスを検索
[s_first, s_last)
範囲[first, last)
インチ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:
Searches for the last subsequence of elements
[s_first, s_last)
in the range [first, last)
. 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 | - | 検討する要素の範囲 Original: the range of elements to examine The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
s_first, s_last | - | 検索する要素の範囲 Original: the range of elements to search for 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 | ||
-ForwardIt1 は ForwardIterator の要求を満足しなければなりません。 | ||
-ForwardIt2 は ForwardIterator の要求を満足しなければなりません。 |
[編集]値を返します
範囲内の最後のサブシーケンス
[s_first, s_last)
の先頭を指すイテレータ[first, last)
.Original:
Iterator to the beginning of last subsequence
[s_first, s_last)
in range [first, last)
.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.
そのような部分列が見つからない場合は、
last
が返されます。 (C++11以前)Original:
If no such subsequence is found,
last
is returned. (C++11以前)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.
[s_first, s_last)
が空であるか、そのような部分列が見つからない場合は、last
が返されます。場合(C++11およびそれ以降)Original:
If
[s_first, s_last)
is empty or if no such subsequence is found, last
is returned. (C++11およびそれ以降)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.
[編集]複雑性
最も
S*(N-S+1)
の比較ではどこS = distance(s_first, s_last)とN = distance(first, last).Original:
Does at most
S*(N-S+1)
comparisons where S = distance(s_first, s_last) and N = distance(first, last).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.
[編集]可能な実装
First version |
---|
template<class ForwardIt1, class ForwardIt2> ForwardIt1 find_end(ForwardIt1 first, ForwardIt1 last, ForwardIt2 s_first, ForwardIt2 s_last){if(s_first == s_last)return last; ForwardIt1 result = last;while(1){ ForwardIt1 new_result =std::search(first, last, s_first, s_last);if(new_result == last){return result;}else{ result = new_result; first = result;++first;}}return result;} |
Second version |
template<class ForwardIt1, class ForwardIt2, class BinaryPredicate> ForwardIt1 find_end(ForwardIt1 first, ForwardIt1 last, ForwardIt2 s_first, ForwardIt2 s_last, BinaryPredicate p){if(s_first == s_last)return last; ForwardIt1 result = last;while(1){ ForwardIt1 new_result =std::search(first, last, s_first, s_last, p);if(new_result == last){return result;}else{ result = new_result; first = result;++first;}}return result;} |
[編集]例
次のコードでは、数字の2つの異なるシーケンスを検索するために使用し
find_end()
. Original:
The following code uses
find_end()
to search for two different sequences of numbers. 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.
#include <algorithm>#include <iostream>#include <vector> int main(){std::vector<int> v{1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4};std::vector<int>::iterator result; std::vector<int> t1{1, 2, 3}; result = std::find_end(v.begin(), v.end(), t1.begin(), t1.end());if(result == v.end()){std::cout<<"subsequence not found\n";}else{std::cout<<"last subsequence is at: "<<std::distance(v.begin(), result)<<"\n";} std::vector<int> t2{4, 5, 6}; result = std::find_end(v.begin(), v.end(), t2.begin(), t2.end());if(result == v.end()){std::cout<<"subsequence not found\n";}else{std::cout<<"last subsequence is at: "<<std::distance(v.begin(), result)<<"\n";}}
出力:
last subsequence is at: 8 subsequence not found
[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) | |
(C++11) | 特定の条件を満たす最初の要素を検索します Original: finds the first element satisfying specific criteria 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) |
searches for any one of a set of elements (関数テンプレート) | |
範囲内の要素の数は連続したコピーを検索します Original: searches for a number consecutive copies of an element in a range 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) |