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std::minmax

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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
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Sorting operations (on sorted ranges)
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バイナリ検索操作(ソート範囲で)
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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 >
std::pair<const T&,const T&> minmax(const T& a, const T& b );
(1) (C++11およびそれ以降)
template<class T, class Compare >
std::pair<const T&,const T&> minmax(const T& a, const T& b, Compare comp );
(2) (C++11およびそれ以降)
template<class T >
std::pair<T,T> minmax(std::initializer_list<T> ilist);
(3) (C++11およびそれ以降)
template<class T, class Compare >
std::pair<T,T> minmax(std::initializer_list<T> ilist, Compare comp );
(4) (C++11およびそれ以降)
1-2)
2つの値のうち小さい方と大きい方を返します。.
Original:
Returns the smaller and the greater of the two values.
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3-4)
初期化子リストilist内の値の最小値と最大を返します。.
Original:
Returns the smallest and the greatest of the values in initializer list ilist.
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(2,4)のバージョンがoperator<与えられた比較関数を使用するのに対し、(1,3)のバージョンでは、値を比較するcomp使用.
Original:
The (1,3) versions use operator< to compare the values, whereas 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)
std::make_pair(a, b)またはa<b場合はaと等価である場合bの結果を返します。 std::make_pair(b, a)場合b<aの結果を返します。.
Original:
Returns the result of std::make_pair(a, b) if a<b or if a is equivalent to b. Returns the result of std::make_pair(b, a) if b<a.
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3-4)
最初の要素としてilist内の最小値と第二としての最大とのペア。いくつかの要素が最小と同等である場合は、一番左のような要素が返されます。いくつかの要素が最大のと同等である場合、右端のような要素が返されます。.
Original:
A pair with the smallest value in ilist as the first element and the greatest as the second. If several elements are equivalent to the smallest, the leftmost such element is returned. If several elements are equivalent to the largest, the rightmost such element is returned.
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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>std::pair<const T&,const T&> minmax(const T& a, const T& b){return(b < a)?std::make_pair(b, a):std::make_pair(a, b);}
Second version
template<class T, class Compare>std::pair<const T&,const T&> minmax(const T& a, const T& b, Compare comp){return comp(b, a)?std::make_pair(b, a):std::make_pair(a, b);}
Third version
template<class T >std::pair<T,T> minmax(std::initializer_list ilist){auto p =std::minmax_element(ilist.begin(), ilist.end());returnstd::make_pair(*p.first, *p.second);}
Fourth version
template<class T, class Compare >std::pair<T,T> minmax(std::initializer_list ilist, Compare comp ){auto p =std::minmax_element(ilist.begin(), ilist.end(), comp);returnstd::make_pair(*p.first, *p.second);}

[編集]

#include <algorithm>#include <iostream>#include <vector>#include <cstdlib>#include <ctime>   int main(){std::vector<int> v {3, 1, 4, 1, 5, 9, 2, 6};std::srand(std::time(0));std::pair<int,int> bounds = std::minmax(std::rand()% v.size(), std::rand()% v.size());   std::cout<<"v["<< bounds.first<<","<< bounds.second<<"]: ";for(int i = bounds.first; i < bounds.second;++i){std::cout<< v[i]<<' ';}std::cout<<'\n';}

Possible output:

v[2,7]: 4 1 5 9 2

[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]
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
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(関数テンプレート)[edit]
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