std::replace, std::replace_if
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<tbody> </tbody>| Dclar dans l'en-tte <algorithm>
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template< class ForwardIt, class T > void replace( ForwardIt first, ForwardIt last, const T& old_value, const T& new_value ); |
(1) | |
template< class ForwardIt, class UnaryPredicate, class T > void replace_if( ForwardIt first, ForwardIt last, UnaryPredicate p, const T& new_value ); |
(2) | |
Remplace tous les lments rpondant des critres spcifiques
new_value dans le [first, last) gamme. La premire version remplace les lments qui sont gaux old_value, la deuxime version remplace les lments pour lesquels prdicat retourne p true . Original:
Replaces all elements satisfying specific criteria with
new_value in the range [first, last). The first version replaces the elements that are equal to old_value, the second version replaces elements for which predicate p returns true. 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.
Paramtres
| first, last | - | l'ensemble d'lments de processus
Original: the range of elements to process 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 lments 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 | - | prdicat unaire qui retourne true si la valeur de l'lment doit tre remplac . 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 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 | ||
-ForwardIt must meet the requirements of ForwardIterator.
| ||
Retourne la valeur
(Aucun)
Original:
(none)
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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Complexit
Exactement
last - first applications du prdicat .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.
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Mise en uvre possible
| First version |
|---|
template<class ForwardIt, class T>
void replace(ForwardIt first, ForwardIt last,
const T& old_value, const T& new_value)
{
for (; first != last; ++first) {
if (*first == old_value) {
*first = new_value;
}
}
}
|
| Second version |
template<class ForwardIt, class UnaryPredicate, class T>
void replace_if(ForwardIt first, ForwardIt last,
UnaryPredicate p, const T& new_value)
{
for (; first != last; ++first) {
if(p(*first)) {
*first = new_value;
}
}
}
|
Exemple
Le code suivant au dbut remplace toutes les occurrences de
8 avec 88 dans un vecteur d'entiers. Puis il remplace toutes les valeurs infrieures 55 .. 5
Original:
The following code at first replaces all occurrences of
8 with 88 in a vector of integers. Then it replaces all values less than 5 with 55.
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 <array>
#include <iostream>
#include <functional>
int main()
{
std::array<int, 10> s{5, 7, 4, 2, 8, 6, 1, 9, 0, 3};
std::replace(s.begin(), s.end(), 8, 88);
for (int a : s) {
std::cout << a << " ";
}
std::cout << '\n';
std::replace_if(s.begin(), s.end(),
std::bind(std::less<int>(), std::placeholders::_1, 5), 55);
for (int a : s) {
std::cout << a << " ";
}
std::cout << '\n';
}
Rsultat :
5 7 4 2 88 6 1 9 0 3
5 7 55 55 99 6 55 9 55 55
Voir aussi
copie d'une plage, le remplacement des lments satisfaisant des critres spcifiques une autre valeur Original: copies a range, replacing elements satisfying specific criteria with another value The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction gnrique) | |