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std::replace_copy, std::replace_copy_if

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Modifying sequence operations
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Partitioning operations
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Sorting operations (on sorted ranges)
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Defined in header <algorithm>
template< class InputIt, class OutputIt, class T >

OutputIt replace_copy( InputIt first, InputIt last, OutputIt d_first,

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

OutputIt replace_copy_if( InputIt first, InputIt last, OutputIt d_first,

                          UnaryPredicate p, const T& new_value );
(2)

Copies the all elements from the range [first, last) to another range beginning at d_first replacing all elements satisfying specific criteria with new_value. The first version replaces the elements that are equal to old_value, the second version replaces elements for which predicate p returns true. The 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 -
der Beginn des Zielbereichs
Original:
the beginning of the destination range
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old_value -
der Wert der Elemente zu ersetzen
Original:
the value of elements to replace
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p - unary predicate which returns ​true
wenn der Wert des Elements ersetzt werden sollte
Original:
if the element value should be replaced
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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 InputIt can be dereferenced and then implicitly converted to Type. ​

new_value -
der Wert als Ersatz verwenden
Original:
the value to use as replacement
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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 replace_copy(InputIt first, InputIt last, OutputIt d_first,
                      const T& old_value, const T& new_value)
{
    for (; first != last; ++first) {
        *d_first++ = (*first == old_value) ? new_value : *first;
    }
    return d_first;
}
Second version
template<class InputIt, class OutputIt, 
         class UnaryPredicate, class T>
OutputIt replace_copy_if(InputIt first, InputIt last, OutputIt d_first,
                         UnaryPredicate p, const T& new_value)
{
    for (; first != last; ++first) {
        *d_first++ = (p( *first ) ? new_value : *first;
    }
    return d_first;
}

[Bearbeiten] Beispiel

The following copy prints a vector, replacing all values over 5 with 99 on the fly.

#include <algorithm>
#include <vector>
#include <iostream>
#include <iterator>
#include <functional>
 
int main()
{
    std::vector<int> v{5, 7, 4, 2, 8, 6, 1, 9, 0, 3};
    std::replace_copy_if(v.begin(), v.end(),
                         std::ostream_iterator<int>(std::cout, " "),
                         [](int n){return n > 5;}, 99);
    std::cout << '\n';
}

Output:

5 99 4 2 99 99 1 99 0 3

[Bearbeiten] Siehe auch

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