std::max_element
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Déclaré dans l'en-tête <algorithm> | ||
template<class ForwardIt > ForwardIt max_element( ForwardIt first, ForwardIt last ); | (1) | |
template<class ForwardIt, class Compare > ForwardIt max_element( ForwardIt first, ForwardIt last, Compare comp ); | (2) | |
Trouve le plus grand élément de la gamme
[first, last). La première version utilise operator< de comparer les valeurs, la deuxième version utilise la fonction de comparaison donnée comp .Original:
Finds the greatest element in the range
[first, last). The first version uses operator< to compare the values, the second version uses the given comparison function comp.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.
Sommaire |
[modifier]Paramètres
| first, last | - | itérateurs terme définissant la plage d'examiner Original: forward iterators defining the range to examine The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
| cmp | - | comparison function which returns true if if *a is less than *b. 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 | ||
-ForwardIt must meet the requirements of ForwardIterator. | ||
[modifier]Retourne la valeur
Iterator pour le plus grand élément de la gamme
[first, last). Si plusieurs éléments de la gamme sont équivalentes au plus grand élément, retourne l'itérateur sur le premier élément tel. Retours last si la plage est vide . Original:
Iterator to the greatest element in the range
[first, last). If several elements in the range are equivalent to the greatest element, returns the iterator to the first such element. Returns last if the range is empty. 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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[modifier]Complexité
Exactement max(N-1,0) comparaisons, où N =std::distance(first, last) .
Original:
Exactly max(N-1,0) comparisons, where N =std::distance(first, last).
The text has been machine-translated via Google Translate.
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[modifier]Mise en œuvre possible
| First version |
|---|
template<class ForwardIt> ForwardIt max_element(ForwardIt first, ForwardIt last){if(first == last){return last;} ForwardIt largest = first;++first;for(; first != last;++first){if(*largest <*first){ largest = first;}}return largest;} |
| Second version |
template<class ForwardIt, class Compare> ForwardIt max_element(ForwardIt first, ForwardIt last, Compare comp){if(first == last){return last;} ForwardIt largest = first;++first;for(; first != last;++first){if(comp(*largest, *first)){ largest = first;}}return largest;} |
[modifier]Exemple
#include <algorithm>#include <iostream>#include <vector>#include <cmath> staticbool abs_compare(int a, int b){return(std::abs(a)< std::abs(b));} int main(){std::vector<int> v{3, 1, -14, 1, 5, 9};std::vector<int>::iterator result; result = std::max_element(v.begin(), v.end());std::cout<<"max element at: "<<std::distance(v.begin(), result)<<'\n'; result = std::max_element(v.begin(), v.end(), abs_compare);std::cout<<"max element (absolute) at: "<<std::distance(v.begin(), result);}
Résultat :
max element at: 5 max element (absolute) at: 2
[modifier]Voir aussi
retourne le plus petit élément dans une plage Original: returns the smallest element 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) | |
(C++11) | retourne le plus petit élément et le plus important dans une gamme Original: returns the smallest and the largest element 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) |
retourne le plus grand des deux éléments Original: returns the larger of two 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) | |
