std::merge
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Déclaré dans l'en-tête <algorithm>
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template< class InputIt1, class InputIt2, class OutputIt > OutputIt merge( InputIt1 first1, InputIt1 last1, |
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template< class InputIt1, class InputIt2, class OutputIt, class Compare> OutputIt merge( InputIt1 first1, InputIt1 last1, |
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[first1, last1)
et [first2, last2)
dans une gamme débutant triés à d_first
. La première version utilise operator< de comparer les éléments, la deuxième version utilise la fonction de comparaison donnée comp
. L'ordre relatif des éléments équivalents est préservée .[first1, last1)
and [first2, last2)
into one sorted range beginning at d_first
. The first version uses operator< to compare the elements, the second version uses the given comparison function comp
. The relative order of equivalent elements is preserved.You can help to correct and verify the translation. Click here for instructions.
Sommaire |
[modifier] Paramètres
first1, last1 | - | la première gamme d'éléments �� fusionner
Original: the first range of elements to merge The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
first2, last2 | - | la seconde plage d'éléments à fusionner
Original: the second range of elements to merge 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. |
comp | - | comparison function which returns true if the first argument is less than the second. The signature of the comparison function should be equivalent to the following: bool cmp(const Type1 &a, const Type2 &b); The signature does not need to have const &, but the function must not modify the objects passed to it. |
Type requirements | ||
-InputIt1 must meet the requirements of InputIterator .
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-InputIt2 must meet the requirements of InputIterator .
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-OutputIt must meet the requirements of OutputIterator .
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[modifier] Retourne la valeur
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[modifier] Complexité
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[modifier] Mise en œuvre possible
First version |
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template<class InputIt1, class InputIt2, class OutputIt> OutputIt merge(InputIt1 first1, InputIt1 last1, InputIt2 first2, InputIt2 last2, OutputIt d_first) { for (; first1 != last1; ++d_first) { if (first2 == last2) { return std::copy(first1, last1, d_first); } if (*first2 < *first1) { *d_first = *first2; ++first2; } else { *d_first = *first1; ++first1; } } return std::copy(first2, last2, d_first); } |
Second version |
template<class InputIt1, class InputIt2, class OutputIt, class Compare> OutputIt merge(InputIt1 first1, InputIt1 last1, InputIt2 first2, InputIt2 last2, OutputIt d_first, Compare comp) { for (; first1 != last1; ++d_first) { if (first2 == last2) { return std::copy(first1, last1, d_first); } if (comp(*first2, *first1)) { *d_first = *first2; ++first2; } else { *d_first = *first1; ++first1; } } return std::copy(first2, last2, d_first); } |
[modifier] Exemple
#include <iostream> #include <iterator> #include <cstdlib> #include <algorithm> #include <vector> int main() { const std::size_t items = 10; std::vector<int> v1, v2, dst; // fill the vectors for (std::size_t idx = 0; idx < items; ++idx) { v1.push_back(std::rand()%items); v2.push_back(std::rand()%items); } // sort std::sort(v1.begin(), v1.end()); std::sort(v2.begin(), v2.end()); // output v1 std::cout << "v1 : "; std::copy(v1.begin(), v1.end(), std::ostream_iterator<int>(std::cout, " ")); std::cout << '\n'; // output v2 std::cout << "v2 : "; std::copy(v2.begin(), v2.end(), std::ostream_iterator<int>(std::cout, " ")); std::cout << '\n'; // merge std::merge(v1.begin(), v1.end(), v2.begin(), v2.end(), std::back_inserter(dst)); // output std::cout << "dst: "; std::copy(dst.begin(), dst.end(), std::ostream_iterator<int>(std::cout, " ")); std::cout << '\n'; }
Résultat :
v1 : 0 0 2 2 3 3 3 6 7 9 v2 : 1 2 5 5 6 6 6 6 7 9 dst: 0 0 1 2 2 2 3 3 3 5 5 6 6 6 6 6 7 7 9 9
[modifier] Voir aussi
fusionne deux gammes commandés sur place Original: merges two ordered ranges in-place The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction générique) | |
trie une plage dans l'ordre ascendant Original: sorts a range into ascending order The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction générique) | |
Trie une plage d'éléments, tout en préservant l'ordre entre des éléments égaux Original: sorts a range of elements while preserving order between equal elements The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction générique) |