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std::is_sorted_until

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< cpp‎ | algorithm

 
 
アルゴリズムライブラリ
機能します
Original:
Functions
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シーケンス動作を非改変
Original:
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
Original:
Partitioning operations
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(ソートされた範囲で)ソート操作
Original:
Sorting operations (on sorted ranges)
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is_sorted(C++11)
is_sorted_until(C++11)
sort
バイナリ検索操作(ソート範囲で)
Original:
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
Original:
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 is_sorted_until( ForwardIt first, ForwardIt last );
(1) (C++11およびそれ以降)
template< class ForwardIt, class Compare >

ForwardIt is_sorted_until( ForwardIt first, ForwardIt last,

                           Compare comp );
(2) (C++11およびそれ以降)
レンジ[first, last)を調べて、要素が昇順にソートされているfirstで最大範囲の始まりを見つけることができます。関数の最初のバージョンは要素を比較するoperator<使用し、2番目はcomp与えられた比較関数を使用しています.
Original:
Examines the range [first, last) and finds the largest range beginning at first in which the elements are sorted in ascending order. The first version of the function uses operator< to compare the elements, the second 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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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 types Type1 and Type2 must be such that an object of type ForwardIterator 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。

[編集] 値を返します

要素が昇順にソートされているfirstで最大範囲の先頭の上限。つまり、itがソートされている範囲の最後のイテレータ[first, it)です.
Original:
The upper bound of the largest range beginning at first in which the elements are sorted in ascending order. That is, the last iterator it for which range [first, it) is sorted.
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[編集] 複雑

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] 可能な実装

First version
template<class ForwardIt>
ForwardIt is_sorted_until(ForwardIt first, ForwardIt last)
{
    if (first != last) {
        ForwardIt next = first;
        while (++next != last) {
            if (*next < *first)
                return next;
            first = next;
        }
    }
    return last;
}
Second version
template< class ForwardIt, class Compare >
ForwardIt is_sorted_until(ForwardIt first, ForwardIt last, 
                          Compare comp)
{
    if (first != last) {
        ForwardIt next = first;
        while (++next != last) {
            if (comp(*next, *first))
                return next;
            first = next;
        }
    }
    return last;

[編集]

#include <iostream>
#include <algorithm>
#include <iterator>
#include <random>
 
int main()
{
    std::random_device rd;
    std::mt19937 g(rd());
    const int N = 6;
    int nums[N] = {3, 1, 4, 1, 5, 9};
 
    const int min_sorted_size = 4;
    int sorted_size = 0;
    do {
        std::random_shuffle(nums, nums + N, g);
        int *sorted_end = std::is_sorted_until(nums, nums + N);
        sorted_size = std::distance(nums, sorted_end);
 
        for (auto i : nums) std::cout << i << ' ';
        std::cout << " : " << sorted_size << " initial sorted elements\n";
    } while (sorted_size < min_sorted_size);
}

Possible output:

4 1 9 5 1 3  : 1 initial sorted elements
4 5 9 3 1 1  : 3 initial sorted elements
9 3 1 4 5 1  : 1 initial sorted elements
1 3 5 4 1 9  : 3 initial sorted elements
5 9 1 1 3 4  : 2 initial sorted elements
4 9 1 5 1 3  : 2 initial sorted elements
1 1 4 9 5 3  : 4 initial sorted elements

[編集] も参照してください

(C++11)
範囲は昇順にソートされているかどうかをチェックします
Original:
checks whether a range is sorted into ascending order
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(関数テンプレート) [edit]