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std::minmax

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C++
 
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以来)
template< class T, class Compare >
std::pair<const T&,const T&> minmax( const T& a, const T& b, Compare comp );
 (2) (C + + 11以来)
template< class T >
std::pair<T,T> minmax( std::initializer_list<T> ilist);
 (3) (C + + 11以来)
template< class T, class Compare >
std::pair<T,T> minmax( std::initializer_list<T> ilist, Compare comp );
 (4) (C + + 11以来)
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.
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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 - comparison function which returns ​true if if a is less than b.

The signature of the comparison function should be equivalent to the following:

bool cmp(const Type1 &a, const Type2 &b);

The signature does not need to have const &, but the function must not modify the objects passed to it.
The types  Type1 and  Type2 must be such that an object of type T can be implicitly converted to both of them. ​

Type requirements
-
T must meet the requirements of LessThanComparable. for the overloads (1) and (3)
-
T must meet the requirements of CopyConstructible. 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

1-2)
定数
Original:
Constant
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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());
    return std::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);
    return std::make_pair(*p.first, *p.second);
}

[編集] 例

#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] も参照してください
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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