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definiert 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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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)

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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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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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);
}

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

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]