std::remove_copy, std::remove_copy_if
De cppreference.com
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<tbody> </tbody>| Déclaré dans l'en-tête <algorithm>
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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) | |
Copie les éléments de la gamme
[first, last), à une autre gamme débutant à d_first, en omettant les éléments qui satisfont à des critères spécifiques. La première version ne tient pas compte des éléments qui sont égaux à value, la deuxième version ne tient pas compte des éléments pour lesquels prédicat retourne p true. Gammes de source et de destination ne peuvent pas se chevaucher .Original:
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.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.
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. |
| value | - | la valeur des éléments non copier
Original: the value of the elements not to copy 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.
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.
Complexité
Exactement
last - first applications du prédicat .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 œuvre possible
| First version |
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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;
}
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| 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;
}
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Exemple
Le code suivant génère une chaîne tout en effaçant les espaces à la volée .
Original:
The following code outputs a string while erasing the spaces 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 <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';
}
Résultat :
before: Text with some spaces
after: Textwithsomespaces