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std::upper_bound

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< 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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lower_bound
upper_bound
(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, class T >
ForwardIt upper_bound( ForwardIt first, ForwardIt last, const T& value );
(1)
template<class ForwardIt, class T, class Compare >
ForwardIt upper_bound( ForwardIt first, ForwardIt last, const T& value, Compare comp );
(2)
[first, last)より'大きい範囲value内の最初の要素を指すイテレータを返します。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、指定された比較関数compを使用しています.
Original:
Returns an iterator pointing to the first element in the range [first, last) that is greater than value. The first version uses operator< to compare the elements, the second version uses the given comparison function comp.
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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
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value -
に要素を比較する値
Original:
value to compare the elements to
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comp - 比較関数. 最初の値が二つ目の値より小さい 場合、 ​trueを返します.

比較関数のシグネチャは以下と同等でなければなりません.

 bool cmp(const Type1 &a, const Type2 &b);

シグネチャはconstを含まなくても構いませんが, 比較関数は渡されたオブジェクトを変更してはなりません.
The type Type1 must be such that an object of type T can be implicitly converted to Type1. The type Type2 must be such that an object of type ForwardIt can be dereferenced and then implicitly converted to Type2. ​

型の要件
-
ForwardItForwardIterator

の要求を満足しなければなりません。

[編集]値を返します

このような要素が見つからない場合大きいのvalueより、またはlastである最初の要素を指すイテレータ.
Original:
iterator pointing to the first element that is greater than value, or last if no such element is found.
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[編集]可能な実装

First version
template<class ForwardIt, class T> ForwardIt upper_bound(ForwardIt first, ForwardIt last, const T& value){ ForwardIt it;std::iterator_traits<ForwardIt>::distance_type count, step; count =std::distance(first,last);   while(count >0){ it = first; step = count /2;std::advance(it, step);if(!(value <*it)){ first =++it; count -= step +1;}else count = step;}return first;}
Second version
template<class ForwardIt, class T, class Compare> ForwardIt upper_bound(ForwardIt first, ForwardIt last, const T& value, Compare comp){ ForwardIt it;std::iterator_traits<ForwardIt>::distance_type count, step; count =std::distance(first,last);   while(count >0){ it = first; step = count /2;std::advance(it, step);if(!comp(value, *it)), first =++it; count -= step +1}else count = step;}return first;}

[編集]

#include <algorithm>#include <iostream>#include <iterator>#include <vector>   int main(){std::vector<int> data ={1, 1, 2, 3, 3, 3, 3, 4, 4, 4, 5, 5, 6};   auto lower =std::lower_bound(data.begin(), data.end(), 4);auto upper = std::upper_bound(data.begin(), data.end(), 4);   std::copy(lower, upper, std::ostream_iterator<int>(std::cout, " "));}

出力:

4 4 4

[編集]複雑性

firstlastとの間の距離の対数
Original:
logarithmic in the distance between first and last
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[編集]参照

特定のキーと一致する要素の範囲を返します
Original:
returns range of elements matching a specific key
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(関数テンプレート)[edit]
最初の要素を指すイテレータを返す指定した値より小さくない
Original:
returns an iterator to the first element not less than the given value
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(関数テンプレート)[edit]
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