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std::is_sorted

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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
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
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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 >
bool is_sorted( ForwardIt first, ForwardIt last );
(1) (C++11およびそれ以降)
template< class ForwardIt, class Compare >
bool is_sorted( ForwardIt first, ForwardIt last, Compare comp );
(2) (C++11およびそれ以降)

Checks if the elements in range [first, last) 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.

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 ForwardIt 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

true if the elements in the range are sorted in ascending order

[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>
bool is_sorted(ForwardIt first, ForwardIt last)
{
    return std::is_sorted_until(first, last) == last;
}
Second version
template<class ForwardIt, class Compare>
bool is_sorted(ForwardIt first, ForwardIt last, Compare comp)
{
    return std::is_sorted_until(first, last, comp) == last;
}

[編集]

#include <iostream>
#include <algorithm>
 
int main() 
{
    const int N = 5;
    int digits[N] = {3, 1, 4, 1, 5};
 
    for (auto i : digits) std::cout << i << ' ';
    std::cout << ": is_sorted: " << std::is_sorted(digits, digits+N) << '\n';
 
    std::sort(digits, digits+N);
 
    for (auto i : digits) std::cout << i << ' ';
    std::cout << ": is_sorted: " << std::is_sorted(digits, digits+N) << '\n';
}

出力:

3 1 4 1 5 : is_sorted: 0
1 1 3 4 5 : is_sorted: 1

[編集] も参照してください

最大のソート部分範囲を見つけることができます
Original:
finds the largest sorted subrange
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(関数テンプレート) [edit]