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std::remove, std::remove_if

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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 T >
ForwardIt remove( ForwardIt first, ForwardIt last, const T& value );
 (1)
template< class ForwardIt, class UnaryPredicate >
ForwardIt remove_if( ForwardIt first, ForwardIt last, UnaryPredicate p );
 (2)
Entfernt alle Elemente, die spezifische Kriterien aus dem Bereich [first, last) erfüllen. Die erste Version entfernt alle Elemente, die gleich value sind, die zweite Version entfernt alle Elemente für die das Prädikat p true zurückgibt.
Original:
Removes all elements satisfying specific criteria from the range [first, last). The first version removes all elements that are equal to value, the second version removes all elements for which predicate p returns true.
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Das Entfernen geschieht durch ein Verschieben aller Elemente des Bereiches, so dass Elemente, die gelöscht werden sollen, überschrieben werden. Die Elemente zwischen dem alten und dem neuen Ende des Bereiches haben unbestimmte Werte. Ein Iterator zum neuen Ende des Bereichs wird zurückgegeben. Die relative Reihenfolge der übrigen Elemente bleibt erhalten .
Original:
Removing is done by shifting the elements in the range in such a way that elements to be erased are overwritten. The elements between the old and the new ends of the range have unspecified values. An iterator to the new end of the range is returned. Relative order of the elements that remain is preserved.
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Inhaltsverzeichnis

[Bearbeiten] Parameter

first, last -
Der Bereich der zu verarbeitenden Elemente
Original:
the range of elements to process
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value -
Der Wert der Elemente die zu entfernen sind
Original:
the value of elements to remove
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p - unary predicate which returns ​true
ob das Element entfernt werden soll
Original:
if the element should be removed
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.

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

 bool pred(const Type &a);

The signature does not need to have const &, but the function must not modify the objects passed to it.
The type Type must be such that an object of type ForwardIt can be dereferenced and then implicitly converted to Type. ​

Type requirements
-
ForwardIt must meet the requirements of ForwardIterator.
-
The type of dereferenced ForwardIt must meet the requirements of MoveAssignable.

[Bearbeiten] Rückgabewert

Iterator zum neuen Ende des Bereichs
Original:
Iterator to the new end of the range
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[Bearbeiten] Komplexität

Genau std::distance(first, last) Anwendungen des Prädikats .
Original:
Exactly std::distance(first, last) applications of the predicate.
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[Bearbeiten] Notes

Die ähnlich benannten Behälter Elementfunktionen list::remove, list::remove_if, forward_list::remove und forward_list::remove_if löscht die entfernten Elemente .
Original:
The similarly-named container member functions list::remove, list::remove_if, forward_list::remove, and forward_list::remove_if erase the removed elements.
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[Bearbeiten] Mögliche Implementierung

First version 
template<class ForwardIt, class T>
ForwardIt remove(ForwardIt first, ForwardIt last, 
                       const T& value)
{
    ForwardIt result = first;
    for (; first != last; ++first) {
        if (!(*first == value)) {
            *result++ = *first;
        }
    }
    return result;
}
Second version 
template<class ForwardIt, class UnaryPredicate>
ForwardIt remove_if(ForwardIt first, ForwardIt last, 
                          UnaryPredicate p)
{
    ForwardIt result = first;
    for (; first != last; ++first) {
        if (!p(*first)) {
            *result++ = *first;
        }
    }
    return result;
}

[Bearbeiten] Beispiel

Der folgende Code entfernt alle Leerzeichen aus einem String, indem sie bis zum Ende des Strings und dann Löschen .
Original:
The following code removes all spaces from a string by moving them to the end of the string and then erasing.
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#include <algorithm>
#include <string>
#include <iostream>
int main()
{
    std::string str = "Text with some   spaces";
    str.erase(std::remove(str.begin(), str.end(), ' '),
              str.end());
    std::cout << str << '\n';
}

Output: 

Textwithsomespaces

[Bearbeiten] Siehe auch
Kopiert einen Bereich von Elementen ohne die Seiten, die bestimmte Kriterien erfüllen
Original:
copies a range of elements omitting those that satisfy specific criteria
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(Funktions-Template) [edit]
Von „https://de.cppreference.com/mwiki/index.php?title=cpp/algorithm/remove&oldid=32024“