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std::max

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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
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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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 T >
const T& max(const T& a, const T& b );
(1)
template<class T, class Compare >
const T& max(const T& a, const T& b, Compare comp );
(2)
template<class T >
T max(std::initializer_list<T> ilist);
(3) (C++11およびそれ以降)
template<class T, class Compare >
T max(std::initializer_list<T> ilist, Compare comp );
(4) (C++11およびそれ以降)
1-2)
2つの値の大きい方を返します。.
Original:
Returns the greater of the two values.
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3-4)
初期化子リストilist内の値の最大を返します。.
Original:
Returns the greatest of the values in initializer list ilist.
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(1,3)のバージョンでは値を比較するoperator<使用、(2,4)のバージョンは、指定された比較関数compを使用.
Original:
The (1,3) versions use operator< to compare the values, the (2,4) versions use the given comparison function comp.
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目次

[編集]パラメータ

a, b -
比較する値
Original:
the values to compare
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ilist -
比較するための値で初期化子リスト
Original:
initializer list with the values to compare
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comp - 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.
Type1及びType2はどちらも型Tから暗黙型変換可能な型でなければなりません. ​

型の要件
-
TLessThanComparable

の要求を満足しなければなりません。 for the overloads (1) and (3)

-
TCopyConstructible

の要求を満足しなければなりません。 for the overloads (3) and (4)

[編集]値を返します

1-2)
aの大きくb。それらが等しい場合、リターンa.
Original:
The greater of a and b. If they are equivalent, returns a.
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3-4)
ilistにおける最大値。いくつかの値が最大と同等である場合は、一番左のいずれかを返します。.
Original:
The greatest value in ilist. If several values are equivalent to the greatest, returns the leftmost one.
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[編集]複雑性

1-2) 定数

3-4)
ilist.size()のリニア
Original:
Linear in ilist.size()
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[編集]可能な実装

First version
template<class T>const T& max(const T& a, const T& b){return(a < b)? b : a;}
Second version
template<class T, class Compare>const T& max(const T& a, const T& b, Compare comp){return(comp(a, b))? b : a;}
Third version
template<class T > T max(std::initializer_list<T> ilist){return*std::max_element(ilist.begin(), ilist.end());}
Fourth version
template<class T, class Compare > T max(std::initializer_list<T> ilist, Compare comp ){return*std::max_element(ilist.begin(), ilist.end(), comp);}

[編集]

#include <algorithm>#include <iostream>#include <string> int main(){std::cout<<"larger of 1 and 9999: "<< std::max(1, 9999)<<'\n'<<"larger of 'a', and 'b': "<< std::max('a', 'b')<<'\n'<<"longest of \"foo\", \"bar\", and \"hello\": "<< std::max({"foo", "bar", "hello"}, [](conststd::string& s1, conststd::string& s2){return s1.size()< s2.size();})<<'\n';}

出力:

larger of 1 and 9999: 9999 larger of 'a', and 'b': b longest of "foo", "bar", and "hello": hello

[編集]参照

二つの要素のうち、小さい方を返します
Original:
returns the smaller of two elements
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(関数テンプレート)[edit]
(C++11)
大きく2つの要素のうち小さい方を返します
Original:
returns the larger and the smaller of two elements
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(関数テンプレート)[edit]
範囲内の最大の要素を返します
Original:
returns the largest element in a range
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(関数テンプレート)[edit]
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