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std::search_n

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C++
 
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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definiert in Header <algorithm>
template< class ForwardIt, class Size, class T >
ForwardIt1 search_n( ForwardIt first, ForwardIt last, Size count, const T& value );
 (1)
template< class ForwardIt, class Size, class T, class BinaryPredicate >

ForwardIt1 search_n( ForwardIt first, ForwardIt last, Size count, const T& value,

                     BinaryPredicate p );
 (2)
Searches der Bereich [first, last) für die erste Folge des Grafen identische Elemente, die jeweils gleich dem angegebenen Wert Wert. Die erste Version verwendet operator== um die Elemente zu vergleichen, verwendet die zweite Version des gegebenen binären Prädikats p .
Original:
Searches the range [first, last) for the first sequence of count identical elements, each equal to the given value value. The first version uses operator== to compare the elements, the second version uses the given binary predicate p.
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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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count -
die Länge der Sequenz zu suchen
Original:
the length of the sequence to search for
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value -
der Wert der Elemente, nach dem gesucht
Original:
the value of the elements to search for
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p - binary predicate which returns ​true if the elements should be treated as equal.

The signature of the predicate function should be equivalent to the following:

 bool pred(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 type  Type1 must be such that an object of type ForwardIt can be dereferenced and then implicitly converted to  Type1. The type  Type2 must be such that an object of type T can be implicitly converted to  Type2.

​

Type requirements
-
ForwardIt must meet the requirements of ForwardIterator.

[Bearbeiten] Rückgabewert

Iiterator an den Anfang des gefundenen Sequenz im Bereich [first, last). Wenn keine solche Sequenz gefunden wird, wird zurückgegeben last .
Original:
Iiterator to the beginning of the found sequence in the range [first, last). If no such sequence is found, last is returned.
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[Bearbeiten] Komplexität

An den meisten last - first Anwendungen des Prädikats .
Original:
At most last - first applications of the predicate.
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[Bearbeiten] Mögliche Implementierung

First version 
template<class ForwardIt, class Size, class T>
ForwardIt1 search_n(ForwardIt first, ForwardIt last,
                          Size count, const T& value)
{
    Size curr_count = 0;
    ForwardIt result, t_last = first;
    std::advance(t_last, std::distance(first, last) - count + 1);
 
    for (; first != t_last; first++) {
        curr_count = 0;
        result = first;
        while (*first == value) {
            curr_count++;
            if (curr_count == count) {
                return result;
            }
            ++first;
        }
    }
    return last;
}
Second version 
template<class ForwardIt, class Size, class T, class BinaryPredicate>
ForwardIt1 search_n(ForwardIt first, ForwardIt last,
                          Size count, const T& value, BinaryPredicate p)
{
    Size curr_count = 0;
    ForwardIt result, t_last = first;
    std::advance(t_last, std::distance(first, last) - count + 1);
 
    for (; first != t_last; first++) {
        curr_count = 0;
        result = first;
        while (p(*first == value)) {
            curr_count++;
            if (curr_count == count) {
                return result;
            }
            ++first;
        }
    }
    return last;
}

[Bearbeiten] Beispiel

This section is incomplete

[Bearbeiten] Siehe auch
findet die letzte Sequenz von Elementen in einem bestimmten Bereich
Original:
finds the last sequence of elements in a certain range
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(Funktions-Template) [edit]


(C++11)
 Findet das erste Elemente, welches bestimmte Kriterien erfüllt
(Funktions-Template) [edit]
searches for a range of elements
(Funktions-Template) [edit]
Von „https://de.cppreference.com/mwiki/index.php?title=cpp/algorithm/search_n&oldid=26114“