std::generate
De cppreference.com
<metanoindex/>
<tbody> </tbody>| Déclaré dans l'en-tête <algorithm>
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template< class ForwardIt, class Generator > void generate( ForwardIt first, ForwardIt last, Generator g ); |
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Attribue à chaque élément dans la plage
[first, last) une valeur générée par l'objet de fonction donnée g . Original:
Assigns each element in range
[first, last) a value generated by the given function object g. The text has been machine-translated via Google Translate.
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Paramètres
| first, last | - | l'ensemble d'éléments à générer
Original: the range of elements to generate The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. | ||||||
| g | - | generator function object that will be called. The signature of the function should be equivalent to the following: <tbody> </tbody>
The type | ||||||
| Type requirements | ||||||||
-ForwardIt must meet the requirements of ForwardIterator.
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Retourne la valeur
(Aucun)
Original:
(none)
The text has been machine-translated via Google Translate.
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Complexité
Exactement
std::distance(first, last) invocations de g() et les affectations .Original:
Exactly
std::distance(first, last) invocations of g() and assignments.The text has been machine-translated via Google Translate.
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Mise en œuvre possible
template<class ForwardIt, class Generator>
void generate(ForwardIt first, ForwardIt last, Generator g)
{
while (first != last) {
*first++ = g();
}
}
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Exemple
Les usages code suivant remplit un vecteur de nombres aléatoires:
Original:
The following code uses fills a vector with random numbers:
The text has been machine-translated via Google Translate.
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#include <algorithm>
#include <iostream>
#include <cstdlib>
int main()
{
std::vector<int> v(5);
std::generate(v.begin(), v.end(), std::rand); // Using the C function rand()
std::cout << "v: ";
for (auto iv: v) {
std::cout << iv << " ";
}
std::cout << "\n";
}
Résultat :
v: 52894 15984720 41513563 41346135 51451456