std::generate_n
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<tbody> </tbody>| Dclar dans l'en-tte <algorithm>
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template< class OutputIt, class Size, class Generator > void generate_n( OutputIt first, Size count, Generator g ); template< class OutputIt, class Size, class Generator > OutputIt generate_n( OutputIt first, Size count, Generator g ); |
(avant C++11) (depuis C++11) |
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Ayants droit, les valeurs gnres par la fonction
g objet donn, aux lments count premiers pas dans la gamme dbutant first, si count>0. Ne fait rien autrement .Original:
Assigns values, generated by given function object
g, to the first count elements in the range beginning at first, if count>0. Does nothing otherwise.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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Paramtres
| first | - | le dbut de la srie d'lments gnrer
Original: the beginning of 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. | ||||||
| count | - | nombre d'lments gnrer
Original: number of the 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 | ||||||||
-OutputIt must meet the requirements of OutputIterator.
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Retourne la valeur
(Aucun) (avant C++11)
Original:
(none) (avant C++11)
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Iterator une aprs le dernier lment affect si
count>0, first autrement. (depuis C++11)Original:
Iterator one past the last element assigned if
count>0, first otherwise. (depuis C++11)The text has been machine-translated via Google Translate.
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Complexit
Exactement
count invocations de g() et des affectations, pour count>0 .Original:
Exactly
count invocations of g() and assignments, for count>0.The text has been machine-translated via Google Translate.
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Mise en uvre possible
template< class OutputIt, class Size, class Generator >
OutputIt generate_n( OutputIt first, Size count, Generator g )
{
for( Size i = 0; i < count; i++ ) {
*first++ = g();
}
return first;
}
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Exemple
Le code suivant remplit un tableau d'entiers avec des nombres alatoires .
Original:
The following code fills an array of integers with random numbers.
The text has been machine-translated via Google Translate.
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#include <cstddef>
#include <cstdlib>
#include <iostream>
#include <iterator>
#include <algorithm>
int main()
{
const std::size_t N = 5;
int ar[N];
std::generate_n(ar, N, std::rand); // Using the C function rand()
std::cout << "ar: ";
std::copy(ar, ar+N, std::ostream_iterator<int>(std::cout, " "));
std::cout << "\n";
}
Rsultat :
52894 15984720 41513563 41346135 51451456
Voir aussi
assigne une valeur un nombre d'lments Original: assigns a value to a number of elements The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction gnrique) | |
enregistre le rsultat d'une fonction dans une plage Original: saves the result of a function 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 gnrique) | |