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std::remove_copy, std::remove_copy_if

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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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copy
copy_if

(C++11)
copy_n(C++11)
copy_backward
move(C++11)
move_backward(C++11)
fill
fill_n
transform
generate
generate_n
remove
remove_if
remove_copy
remove_copy_if
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 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 InputIt, class OutputIt, class T >

OutputIt remove_copy( InputIt first, InputIt last, OutputIt d_first,

                      const T& value );
(1)
template< class InputIt, class OutputIt, class UnaryPredicate >

OutputIt remove_copy_if( InputIt first, InputIt last, OutputIt d_first,

                         UnaryPredicate p );
(2)

Copies elements from the range [first, last), to another range beginning at d_first, omitting the elements which satisfy specific criteria. The first version ignores the elements that are equal to value, the second version ignores the elements for which predicate p returns true. Source and destination ranges cannot overlap.

Inhaltsverzeichnis

[Bearbeiten] Parameter

first, last -
der Bereich der zu kopierenden Elemente
Original:
the range of elements to copy
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d_first - the beginning of the destination range.
value - the value of the elements not to copy
Type requirements
-
InputIt must meet the requirements of InputIterator.
-
OutputIt must meet the requirements of OutputIterator.

[Bearbeiten] Rückgabewert

Iterator das Element nach dem letzten Element kopiert .
Original:
Iterator to the element past the last element copied.
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[Bearbeiten] Komplexität

Genau last - first Anwendungen des Prädikats .
Original:
Exactly last - first applications of the predicate.
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[Bearbeiten] Mögliche Implementierung

First version
template<class InputIt, class OutputIt, class T>
OutputIt remove_copy(InputIt first, InputIt last,
                     OutputIt d_first, const T& value)
{
    for (; first != last; ++first) {
        if (!(*first == value)) {
            *d_first++ = *first;
        }
    }
    return d_first;
}
Second version
template<class InputIt, class OutputIt, class UnaryPredicate>
OutputIt remove_copy_if(InputIt first, InputIt last,
                        OutputIt d_first, UnaryPredicate p)
{
    for (; first != last; ++first) {
        if (!p(*first)) {
            *d_first++ = *first;
        }
    }
    return d_first;
}

[Bearbeiten] Beispiel

The following code outputs a string while erasing the spaces on the fly.

#include <algorithm>
#include <iterator>
#include <string>
#include <iostream>
int main()
{
    std::string str = "Text with some   spaces";
    std::cout << "before: " << str << "\n";
 
    std::cout << "after:  ";
    std::remove_copy(str.begin(), str.end(),
                     std::ostream_iterator<char>(std::cout), ' ');
    std::cout << '\n';
}

Output:

before: Text with some   spaces
after:  Textwithsomespaces

[Bearbeiten] Siehe auch

Entfernt Elemente erfüllen bestimmte Kriterien
Original:
removes elements satisfying specific criteria
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(Funktions-Template) [edit]