std::list::sort – cppreference.com

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`void sort();`	(1)

`template< class Compare > void sort( Compare comp );`	(2)

Sortiert die Elemente in aufsteigender Reihenfolge. Die Reihenfolge der gleiche Elemente garantiert erhalten. Die erste Version verwendet operator< um die Elemente zu vergleichen, verwendet die zweite Version des gegebenen Vergleichsfunktion comp. Die Reihenfolge der äquivalente Elemente erhalten bleibt .

Original:

Sorts the elements in ascending order. The order of equal elements is guaranteed to be preserved. The first version uses operator< to compare the elements, the second version uses the given comparison function comp. The ordering of equivalent elements is preserved.

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Parameter

comp

comparison function which returns true if the first argument is less than the second.

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 list<T,Allocator>::const_iterator can be dereferenced and then implicitly converted to both of them.

Rückgabewert

(None)

Original:

(none)

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Beispiel

#include <iostream>
#include <functional>
#include <list>

std::ostream& operator<<(std::ostream& ostr, const std::list<int>& list)
{
    for (auto &i : list) {
        ostr << " " << i;
    }
    return ostr;
}

int main()
{
    std::list<int> list = { 8,7,5,9,0,1,3,2,6,4 };

    std::cout << "before:     " << list << "\n";
    list.sort();
    std::cout << "ascending:  " << list << "\n";
    list.sort(std::greater<int>());
    std::cout << "descending: " << list << "\n";
}

Output:

before:      8 7 5 9 0 1 3 2 6 4
ascending:   0 1 2 3 4 5 6 7 8 9
descending:  9 8 7 6 5 4 3 2 1 0

Komplexität

N · log(N) Vergleiche, wo N ist die Größe des Behälters .

Original:

N · log(N) comparisons, where N is the size of the container.

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