std::replace_copy, std::replace_copy_if – cppreference.com

std::replace_copy, std::replace_copy_if

Aus cppreference.com

<metanoindex/>

 
C++
 
Algorithm Bibliothek
Funktionen
Original:
Functions
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Nicht-modifizierende Sequenz Operationen
Original:
Non-modifying sequence operations
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Modifizierende Sequenz Operationen
Original:
Modifying sequence operations
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Partitionierungsoperationen
Original:
Partitioning operations
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Sortierung Operationen (auf sortierten Bereiche)
Original:
Sorting operations (on sorted ranges)
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Binary Suchaktionen (auf sortierten Bereiche)
Original:
Binary search operations (on sorted ranges)
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Set-Operationen (auf sortierten Bereiche)
Original:
Set operations (on sorted ranges)
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Heap-Operationen
Original:
Heap operations
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Minimum / Maximum Operationen
Original:
Minimum/maximum operations
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Numerische Operationen
Original:
Numeric operations
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
C-Bibliothek
Original:
C library
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
 
<tbody> </tbody>
definiert 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.

Parameter

first, last -
der Bereich der zu kopierenden Elemente
Original:
the range of elements to copy
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
d_first -
der Beginn des Zielbereichs
Original:
the beginning of the destination range
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
old_value -
der Wert der Elemente zu ersetzen
Original:
the value of elements to replace
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
p - unary predicate which returns ​true
wenn der Wert des Elements ersetzt werden sollte
Original:
if the element value should be replaced
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
.

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
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Type requirements
-
InputIt must meet the requirements of InputIterator.
-
OutputIt must meet the requirements of OutputIterator.

Rückgabewert

Iterator das Element nach dem letzten Element kopiert .
Original:
Iterator to the element past the last element copied.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

Komplexität

Genau last - first Anwendungen des Prädikats .
Original:
Exactly last - first applications of the predicate.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

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;
}

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

Siehe auch