std::upper_bound
提供: cppreference.com
![]() |
This page has been machine-translated from the English version of the wiki using Google Translate.
The translation may contain errors and awkward wording. Hover over text to see the original version. You can help to fix errors and improve the translation. For instructions click here. |
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
.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. |
value | - | に要素を比較する値
Original: value to compare the elements to The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
comp | - | comparison function which returns true if the first argument is less than the second. The signature of the comparison function should be equivalent to the following: bool cmp(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. |
Type requirements | ||
-ForwardIt must meet the requirements of ForwardIterator .
|
[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.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 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] 例
#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, " ")); }
Output:
4 4 4
[編集] 複雑
first
last
との間の距離の対数Original:
logarithmic 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.
You can help to correct and verify the translation. Click here for instructions.
[編集] も参照してください
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 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) | |
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 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) |