std::unique_copy
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<metanoindex/>
<tbody> </tbody>| Déclaré dans l'en-tête <algorithm>
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template< class InputIt, class OutputIt > ForwardIt unique_copy( InputIt first, InputIt last, OutputIt d_first ); |
(1) | |
template< class InputIt, class OutputIt, class BinaryPredicate > ForwardIt unique_copy( InputIt first, InputIt last, OutputIt d_first, BinaryPredicate p ); |
(2) | |
Copier les éléments de la gamme
[first, last), à une autre gamme de début d_first de telle sorte qu'il n'y a pas d'éléments consécutifs égaux. Seul le premier élément de chaque groupe d'éléments égal est copié. La première version utilise operator== de comparer les éléments, la deuxième version utilise le prédicat binaire donné p .Original:
Copies the elements from the range
[first, last), to another range beginning at d_first in such a way that there are no consecutive equal elements. Only the first element of each group of equal elements is copied. The first version uses operator== to compare the elements, the second version uses the given binary predicate p.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'ensemble d'éléments 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. |
| 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. |
| p | - | binary predicate which returns true if the elements should be treated as equal. The signature of the predicate function should be equivalent to the following:
The signature does not need to have |
| Type requirements | ||
-InputIt must meet the requirements of InputIterator.
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-OutputIt must meet the requirements of OutputIterator.
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-The type of dereferenced InputIt must meet the requirements of CopyAssignable.
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-The type of dereferenced InputIt must meet the requirements of CopyConstructible. if neither InputIt nor OutputIt satisfies ForwardIterator
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Retourne la valeur
Itérateur de sortie de l'élément après le dernier élément écrit
Original:
Output iterator to the element past the last written element
The text has been machine-translated via Google Translate.
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Mise en œuvre possible
| First version |
|---|
template<class ForwardIt, class OutputIt>
ForwardIt unique_copy(ForwardIt first, ForwardIt last,
OutputIt d_first)
{
if (first == last)
return d_first;
*d_first = *first;
while (++first != last) {
if (!(*d_first == *first)) {
*(++d_first) = *first;
}
}
return ++d_first;
}
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| Second version |
template<class ForwardIt, class OutputIt, class BinaryPredicate>
ForwardIt unique_copy(ForwardIt first, ForwardIt last,
OutputIt d_first, BinaryPredicate p)
{
if (first == last)
return d_first;
*d_first = *first;
while (++first != last) {
if (!p(*result, *first)) {
*(++d_first) = *first;
}
}
return ++d_first;
}
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Exemple
Les garnitures de programme suivants tous les différents espaces consécutifs dans un const string et imprime le résultat
Original:
The following program trims all multiple consecutive spaces in a const string and prints the result
The text has been machine-translated via Google Translate.
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#include <string>
#include <iostream>
#include <algorithm>
#include <iterator>
int main()
{
std::string s1 = "The string with many spaces!";
std::cout << "before: " << s1 << '\n';
std::string s2;
std::unique_copy(s1.begin(), s1.end(), std::back_inserter(s2),
[](char c1, char c2){ return c1 == ' ' && c2 == ' '; });
std::cout << "after: " << s2 << '\n';
}
Résultat :
before: The string with many spaces!
after: The string with many spaces!
Complexité
linéaire de la distance entre
first et lastOriginal:
linear in the distance between
first and lastThe 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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Voir aussi
trouve deux identiques (ou une autre relation) des éléments adjacents les uns aux autres Original: finds two identical (or some other relationship) items adjacent to each other The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction générique) | |
supprime les doublons successifs dans une plage Original: removes consecutive duplicate elements in a range The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction générique) | |