std::replace_copy, std::replace_copy_if
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<metanoindex/>
<tbody> </tbody>| Déclaré dans l'en-tête <algorithm>
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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) | |
Copie tous les éléments de la gamme
[first, last) à un autre début de la plage à d_first remplacer tous les éléments répondant à des critères spécifiques new_value. La première version remplace les éléments qui sont égaux à old_value, la deuxième version remplace les éléments pour lesquels prédicat retourne p true. Les gammes de source et de destination ne peuvent pas se chevaucher .Original:
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.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
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Paramètres
| first, last | - | l'éventail des éléments à copier
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 | - | le début de la plage de destination
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 | - | la valeur des éléments à remplacer
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 | - | prédicat unéaire qui retourne true si la valeur de l'élément doit être remplacé . 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. L'expression |
| new_value | - | la valeur à utiliser en remplacement
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.
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-OutputIt must meet the requirements of OutputIterator.
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Retourne la valeur
Itérateur à l'élément après le dernier élément copié .
Original:
Iterator to the element past the last element copied.
The text has been machine-translated via Google Translate.
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Complexité
Exactement
last - first applications du prédicat .Original:
Exactly
last - first applications of the predicate.The text has been machine-translated via Google Translate.
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Mise en œuvre possible
| First version |
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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;
}
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| 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;
}
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Exemple
La copie suivante imprime un vecteur, en remplaçant toutes les valeurs de plus de 5 à 99 à la volée .
Original:
The following copy prints a vector, replacing all values over 5 with 99 on the fly.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
#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';
}
Résultat :
5 99 4 2 99 99 1 99 0 3
Voir aussi
supprime des éléments répondant à des critères spécifiques Original: removes elements satisfying specific criteria The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction générique) | |