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std::max

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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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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) (seit C++11)
template< class T, class Compare >
T max( std::initializer_list<T> ilist, Compare comp );
(4) (seit C++11)
1-2)
Gibt die größere der beiden Werte .
Original:
Returns the greater of the two values.
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3-4)
Gibt den größten der Werte in Initialisierungsliste ilist .
Original:
Returns the greatest of the values in initializer list ilist.
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Die (1,3)-Versionen verwenden operator<, um die Werte zu vergleichen, verwenden die (2,4)-Versionen der angegebenen Vergleichsfunktion comp .
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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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
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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)
Je größer der a und b. Wenn sie gleichwertig sind, kehrt a .
Original:
The greater of a and b. If they are equivalent, returns a.
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3-4)
Der größte Wert in ilist. Wenn mehrere Werte entspricht dem größten sind, gibt die linke ein .
Original:
The greatest value in ilist. If several values are equivalent to the greatest, returns the leftmost one.
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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> 
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);
}

[Bearbeiten] Beispiel

#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" },
                            [](const std::string& s1, const std::string& s2) {
                                 return s1.size() < s2.size();
                             }) << '\n';
}

Output:

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

[Bearbeiten] Siehe auch

gibt den kleineren der beiden Elemente
Original:
returns the smaller of two elements
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(Funktions-Template) [edit]
(C++11)
gibt den größeren und den kleineren der beiden Elemente
Original:
returns the larger and the smaller of two elements
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(Funktions-Template) [edit]
kehrt das größte Element in einem Bereich
Original:
returns the largest element in a range
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(Funktions-Template) [edit]