std::max_element
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Defined in header <algorithm> | ||
template<class ForwardIt > ForwardIt max_element( ForwardIt first, ForwardIt last ); | (1) | |
template<class ForwardIt, class Compare > ForwardIt max_element( ForwardIt first, ForwardIt last, Compare comp ); | (2) | |
Finds the greatest element in the range [first, last). The first version uses operator< to compare the values, the second version uses the given comparison function comp.
目次 |
[編集]パラメータ
| first, last | - | 検討する範囲を定義前方反復子 Original: forward iterators defining the range to examine The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
| cmp | - | 比較関数. if *a is less than *b 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 |
| 型の要件 | ||
-ForwardIt 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
Iterator to the greatest element in the range [first, last). If several elements in the range are equivalent to the greatest element, returns the iterator to the first such element. Returns last if the range is empty.
[編集]複雑性
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[編集]可能な実装
| First version |
|---|
template<class ForwardIt> ForwardIt max_element(ForwardIt first, ForwardIt last){if(first == last){return last;} ForwardIt largest = first;++first;for(; first != last;++first){if(*largest <*first){ largest = first;}}return largest;} |
| Second version |
template<class ForwardIt, class Compare> ForwardIt max_element(ForwardIt first, ForwardIt last, Compare comp){if(first == last){return last;} ForwardIt largest = first;++first;for(; first != last;++first){if(comp(*largest, *first)){ largest = first;}}return largest;} |
[編集]例
#include <algorithm>#include <iostream>#include <vector>#include <cmath> staticbool abs_compare(int a, int b){return(std::abs(a)< std::abs(b));} int main(){std::vector<int> v{3, 1, -14, 1, 5, 9};std::vector<int>::iterator result; result = std::max_element(v.begin(), v.end());std::cout<<"max element at: "<<std::distance(v.begin(), result)<<'\n'; result = std::max_element(v.begin(), v.end(), abs_compare);std::cout<<"max element (absolute) at: "<<std::distance(v.begin(), result);}
出力:
max element at: 5 max element (absolute) at: 2
[編集]参照
範囲内の最小の要素を返します Original: returns the smallest 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) | |
(C++11) | 範囲内の最小と最大の要素を返します Original: returns the smallest and the largest 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) |
二つの要素のうちの大きい方を返します Original: returns the larger of two elements 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) | |
