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std::is_heap

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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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is_heap
is_heap_until(C++11)
make_heap
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 RandomIt >
bool is_heap( RandomIt first, RandomIt last );
(1)
template< class RandomIt, class Compare >
bool is_heap( RandomIt first, RandomIt last, Compare comp );
(2)
Prüft, ob die Elemente im Bereich [first, last) sind ein Haufen .
Original:
Checks if the elements in range [first, last) are a heap.
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Die erste Version von is_heap verwendet operator< zum Vergleichen von Elementen, während die zweite verwendet die angegebene Vergleichs-Funktion comp .
Original:
The first version of is_heap uses operator< to compare elements, whereas the second uses the given comparison function comp.
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Inhaltsverzeichnis

[Bearbeiten] Parameter

first, last -
das Spektrum der Elemente zu untersuchen
Original:
the range of elements to examine
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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 RandomIt can be dereferenced and then implicitly converted to both of them. ​

Type requirements
-
RandomIt must meet the requirements of RandomAccessIterator.

[Bearbeiten] Rückgabewert

true wenn der Bereich Heap ist, false sonst .
Original:
true if the range is heap, false otherwise.
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[Bearbeiten] Komplexität

Linear im Abstand first und last
Original:
Linear in the distance between first and last
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[Bearbeiten] Notes

A Haufen ist ein Bereich von Elementen [f,l) das hat die folgenden Eigenschaften:
Original:
A heap is a range of elements [f,l) that has the following properties:
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  • *f ist das größte Element in dem Bereich
    Original:
    *f is the largest element in the range
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  • ein neues Element hinzugefügt mit std::push_heap() werden
    Original:
    a new element can be added using std::push_heap()
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  • das erste Element kann mit Hilfe std::pop_heap() werden
    Original:
    the first element can be removed using std::pop_heap()
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Die tatsächliche Anordnung der Elemente ist die Umsetzung definiert .
Original:
The actual arrangement of the elements is implementation defined.
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[Bearbeiten] Beispiel

#include <iostream>
#include <algorithm>
 
int main()
{
    std::vector<int> v { 3, 1, 4, 1, 5, 9 };
 
    std::cout << "initially, v: ";
    for (auto i : v) std::cout << i << ' ';
    std::cout << '\n';
 
    if (!std::is_heap(v.begin(), v.end())) {
        std::cout << "making heap...\n";
        std::make_heap(v.begin(), v.end());
    }
 
    std::cout << "after make_heap, v: ";
    for (auto i : v) std::cout << i << ' ';
    std::cout << '\n';
}

Output:

initially, v: 3 1 4 1 5 9 
making heap...
after make_heap, v: 9 5 4 1 1 3

[Bearbeiten] Siehe auch

findet den größten Teilbereich, der Haufen ist
Original:
finds the largest subrange that is heap
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(Funktions-Template) [edit]