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std::adjacent_difference

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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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adjacent_difference
partial_sum
C-Bibliothek
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C library
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Defined in header <numeric>
template< class InputIt, class OutputIt >

OutputIt adjacent_difference( InputIt first, InputIt last,

                                    OutputIt d_first );
(1)
template< class InputIt, class OutputIt, class BinaryOperation >

OutputIt adjacent_difference( InputIt first, InputIt last,
                                    OutputIt d_first,

                                    BinaryOperation op );
(2)
Berechnet die Unterschiede zwischen der zweiten und der ersten von jedem benachbarten Paar von Elementen des Bereichs [first, last) und schreibt sie in dem Bereich beginnend bei d_first + 1. Unveränderte Kopie first wird d_first geschrieben. Die erste Version verwendet, um die Unterschiede operator- berechnen, verwendet die zweite Version des gegebenen binären Funktion op .
Original:
Computes the differences between the second and the first of each adjacent pair of elements of the range [first, last) and writes them to the range beginning at d_first + 1. Unmodified copy of first is written to d_first. The first version uses operator- to calculate the differences, the second version uses the given binary function op.
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Equivalent Betrieb:
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Equivalent operation:
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*(d_first)   = *first;
*(d_first+1) = (*first+1) - *(first);
*(d_first+2) = (*first+2) - *(first+1);
*(d_first+3) = (*first+3) - *(first+2);
...

Inhaltsverzeichnis

[Bearbeiten] Parameter

first, last -
das Spektrum der Elemente
Original:
the range of elements
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d_first -
der Beginn des Zielbereichs
Original:
the beginning of the destination range
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op - binary operation function object that will be applied.

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

 Ret fun(const Type1 &a, const Type2 &b);

The signature does not need to have const &.
The types  Type1 and  Type2 must be such that an object of type iterator_traits<InputIt>::value_type can be implicitly converted to both of them. The type  Ret must be such that an object of type OutputIt can be dereferenced and assigned a value of type  Ret. ​

Type requirements
-
InputIt must meet the requirements of InputIterator.
-
OutputIt must meet the requirements of OutputIterator.

[Bearbeiten] Rückgabewert

Es an das Element nach dem letzten Element geschrieben .
Original:
It to the element past the last element written.
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[Bearbeiten] Komplexität

Genau (last - first) - 1 Anwendungen der binären Operation
Original:
Exactly (last - first) - 1 applications of the binary operation
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[Bearbeiten] Mögliche Implementierung

First version
template<class InputIt, class OutputIt>
OutputIt adjacent_difference(InputIt first, InputIt last, 
                             OutputIt d_first)
{
    if (first == last) return d_first;
 
    typedef typename std::iterator_traits<InputIt>::value_type value_t;
    value_t acc = *first;
    *d_first = acc;
    while (++first != last) {
        value_t val = *first;
        *++d_first = val - acc;
        acc = std::move(val);
    }
    return ++d_first;
}
Second version
template<class InputIt, class T, class BinaryOperation>
OutputIt adjacent_difference(InputIt first, InputIt last, 
                             OutputIt d_first, BinaryOperation op)
{
    if (first == last) return d_first;
 
    typedef typename std::iterator_traits<InputIt>::value_type value_t;
    value_t acc = *first;
    *d_first = acc;
    while (++first != last) {
        value_t val = *first;
        *++d_first = op(val, acc);
        acc = std::move(val);
    }
    return ++d_first;
}

[Bearbeiten] Beispiel

Der folgende Code konvertiert eine Folge von geraden Zahlen von Wiederholungen der Zahl 2 und wandelt eine Sequenz von Einsen mit einer Sequenz der Fibonacci-Zahlen .
Original:
The following code converts a sequence of even numbers to repetitions of the number 2 and converts a sequence of ones to a sequence of Fibonacci numbers.
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#include <numeric>
#include <vector>
#include <iostream>
#include <functional>
int main()
{
    std::vector<int> v{2, 4, 6, 8, 10, 12, 14, 16, 18, 20};
    std::adjacent_difference(v.begin(), v.end(), v.begin());
 
    for(auto n: v) {
        std::cout << n << ' ';
    }
    std::cout << '\n';
 
    v = {1, 1, 1, 1, 1, 1, 1, 1, 1, 1};
    std::adjacent_difference(v.begin(), v.end()-1, v.begin()+1, std::plus<int>()
 
    for(auto n: v) {
        std::cout << n << ' ';
    }
    std::cout << '\n';
}

Output:

2 2 2 2 2 2 2 2 2 2
1 1 2 3 5 8 13 21 34 55

[Bearbeiten] Siehe auch

berechnet die Teilsumme von einer Reihe von Elementen
Original:
computes the partial sum of a range of elements
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(Funktions-Template) [edit]
fasst eine Reihe von Elementen
Original:
sums up a range of elements
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(Funktions-Template) [edit]