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std::minmax

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C++
 
Algorithm Bibliothek
Funktionen
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Functions
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Nicht-modifizierende Sequenz Operationen
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Non-modifying sequence operations
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Modifizierende Sequenz Operationen
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Modifying sequence operations
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Partitionierungsoperationen
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Partitioning operations
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Sortierung Operationen (auf sortierten Bereiche)
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Sorting operations (on sorted ranges)
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Binary Suchaktionen (auf sortierten Bereiche)
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Binary search operations (on sorted ranges)
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Set-Operationen (auf sortierten Bereiche)
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Set operations (on sorted ranges)
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Heap-Operationen
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Heap operations
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Minimum / Maximum Operationen
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Minimum/maximum operations
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Numerische Operationen
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Numeric operations
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C-Bibliothek
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C library
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definiert in Header <algorithm>
template< class T >
std::pair<const T&,const T&> minmax( const T& a, const T& b );
 (1) (seit C++11)
template< class T, class Compare >
std::pair<const T&,const T&> minmax( const T& a, const T& b, Compare comp );
 (2) (seit C++11)
template< class T >
std::pair<T,T> minmax( std::initializer_list<T> ilist);
 (3) (seit C++11)
template< class T, class Compare >
std::pair<T,T> minmax( std::initializer_list<T> ilist, Compare comp );
 (4) (seit C++11)
1-2)
Gibt den kleineren und den größeren der beiden Werte .
Original:
Returns the smaller and the greater of the two values.
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3-4)
Gibt die kleinste und die größte der Werte in Initialisierungsliste ilist .
Original:
Returns the smallest and the greatest of the values in initializer list ilist.
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Die (1,3)-Versionen verwenden operator<, um die Werte zu vergleichen, während die (2,4)-Versionen der angegebenen Vergleichsfunktion verwenden comp .
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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Inhaltsverzeichnis

[Bearbeiten] Parameter

a, b -
die Werte zu vergleichen
Original:
the values to compare
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ilist -
initializer Liste mit den Werten zu vergleichen
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)

[Bearbeiten] Rückgabewert

1-2)
Gibt das Ergebnis der std::make_pair(a, b) wenn a<b oder wenn a entspricht b. Gibt das Ergebnis der std::make_pair(b, a) wenn b<a .
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)
Ein Paar mit dem kleinsten Wert in ilist als erstes Element und der größten wie die zweite. Wenn mehrere Elemente entspricht der kleinsten sind, wird die am weitesten links solches Element zurückgegeben. Wenn mehrere Elemente entspricht dem größten sind, wird die am weitesten rechts solches Element zurückgegeben .
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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[Bearbeiten] Komplexität

1-2)
Constant
Original:
Constant
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3-4)
Linear in ilist.size()
Original:
Linear in ilist.size()
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[Bearbeiten] Mögliche Implementierung

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);
}

[Bearbeiten] Beispiel

#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

[Bearbeiten] Siehe auch
gibt den kleineren der beiden Elemente
Original:
returns the smaller of two elements
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(Funktions-Template) [edit]
liefert den größeren der beiden Elemente
Original:
returns the larger of two elements
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(Funktions-Template) [edit]
Von „https://de.cppreference.com/mwiki/index.php?title=cpp/algorithm/minmax&oldid=26097“