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std::set_union

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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 InputIt1, class InputIt2, class OutputIt >

OutputIt set_union( InputIt1 first1, InputIt1 last1,
                    InputIt2 first2, InputIt2 last2,

                    OutputIt d_first );
(1)
template< class InputIt1, class InputIt2,

          class OutputIt, class Compare >
OutputIt set_union( InputIt1 first1, InputIt1 last1,
                    InputIt2 first2, InputIt2 last2,

                    OutputIt d_first, Compare comp );
(2)
Konstruiert eine sortierte Bereich ab ca. d_first bestehend aus allen Elementen, die in einem oder beiden sortierten reicht [first1, last1) und [first2, last2). Die erste Version rechnet sowohl Eingangsbereiche mit operator< sortiert werden, rechnet die zweite Version sie mit dem angegebenen Vergleichsfunktion comp sortiert werden. Wenn einige Element m Mal gefunden [first1, last1) und n Zeiten in [first2, last2), dann sind alle Elemente wird von m [first1, last1) um d_first kopiert werden, Konservierungsmitteln Reihenfolge und dann genau std::max(n-m, 0) Elemente wird von [first2, last2) um d_first kopiert werden, zur Haltbarmachung sortiert. Die daraus resultierende Bereich kann nicht mit einem der Eingangsbereiche überschneiden .
Original:
Constructs a sorted range beginning at d_first consisting of all elements present in one or both sorted ranges [first1, last1) and [first2, last2). The first version expects both input ranges to be sorted with operator<, the second version expects them to be sorted with the given comparison function comp. If some element is found m times in [first1, last1) and n times in [first2, last2), then all m elements will be copied from [first1, last1) to d_first, preserving order, and then exactly std::max(n-m, 0) elements will be copied from [first2, last2) to d_first, also preserving order. The resulting range cannot overlap with either of the input ranges.
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Inhaltsverzeichnis

[Bearbeiten] Parameter

first1, last1 -
der erste Eingang sortiert Bereich
Original:
the first input sorted range
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first2, last2 -
der zweite Eingang sortiert Bereich
Original:
the second input sorted range
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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 objects of types InputIt1 and InputIt2 can be dereferenced and then implicitly converted to Type1 and Type2 respectively. ​

Type requirements
-
InputIt1 must meet the requirements of InputIterator.
-
InputIt2 must meet the requirements of InputIterator.
-
OutputIt must meet the requirements of OutputIterator.

[Bearbeiten] Rückgabewert

Iterator über das Ende der konstruiert Bereich .
Original:
Iterator past the end of the constructed range.
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[Bearbeiten] Komplexität

Allenfalls 2·(N1+N2-1) Vergleiche, wo N1 = std::distance(first1, last1) und N2 = std::distance(first2, last2) .
Original:
At most 2·(N1+N2-1) comparisons, where N1 = std::distance(first1, last1) and N2 = std::distance(first2, last2).
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[Bearbeiten] Mögliche Implementierung

First version
template<class InputIt1, class InputIt2, class OutputIt>
OutputIt set_union(InputIt1 first1, InputIt1 last1,
                   InputIt2 first2, InputIt2 last2,
                   OutputIt d_first)
{
    for (; first1 != last1; ++d_first) {
        if (first2 == last2)
            return std::copy(first1, last1, d_first);
        if (*first2 < *first1) {
            *d_first = *first2++;
        } else {
            *d_first = *first1;
            if (!(*first1 < *first2))
                ++first2;
            ++first1;
        }
    }
    return std::copy(first2, last2, d_first);
}
Second version
template<class InputIt1, class InputIt2,
         class OutputIt, class Compare>
OutputIt set_union(InputIt1 first1, InputIt1 last1,
                   InputIt2 first2, InputIt2 last2,
                   OutputIt d_first, Compare comp)
{
    for (; first1 != last1; ++d_first) {
        if (first2 == last2)
            return std::copy(first1, last1, d_first);
        if (comp(*first2, *first1)) {
            *d_first = *first2++;
        } else {
            *d_first = *first1;
            if (!comp(*first1, *first2))
                ++first2;
            ++first1;
        }
    }
    return std::copy(first2, last2, d_first);
}

[Bearbeiten] Beispiel

[Bearbeiten] Siehe auch

liefert true, wenn ein Satz ist eine Teilmenge des anderen
Original:
returns true if one set is a subset of another
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(Funktions-Template) [edit]
berechnet die Differenz zwischen zwei Sätzen
Original:
computes the difference between two sets
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(Funktions-Template) [edit]
berechnet den Schnittpunkt von zwei Sätzen
Original:
computes the intersection of two sets
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(Funktions-Template) [edit]
berechnet die symmetrische Differenz zwischen zwei Sätzen
Original:
computes the symmetric difference between two sets
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(Funktions-Template) [edit]