std::generate_n
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| Elemento definito nell'header <algorithm>
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| template< class OutputIt, class Size, class Generator > void generate_n( OutputIt first, Size count, Generator g ); |
(fino al c++11) (dal C++11) |
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Assegna valori, generati da
g data funzione oggetto, agli elementi count primi all'inizio gamma a first, se count>0. Non fa niente altrimenti.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.
You can help to correct and verify the translation. Click here for instructions.
Indice |
[modifica] Parametri
| first | - | l'inizio dell'intervallo di elementi da generare
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 | - | numero di elementi da generare
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:
The type Ret must be such that an object of type OutputIt can be dereferenced and assigned a value of type Ret. | |||||||||
| Type requirements | |||||||||||
-OutputIt must meet the requirements of OutputIterator.
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[modifica] Valore di ritorno
(Nessuno) (fino al c++11)
Original:
(none) (fino al c++11)
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.
Iterator un passato l'ultimo elemento assegnato se
count>0, first altrimenti. (dal C++11)Original:
Iterator one past the last element assigned if
count>0, first otherwise. (dal C++11)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.
[modifica] Complessità
Esattamente
count invocazioni di g() e le assegnazioni, per count>0.Original:
Exactly
count invocations of g() and assignments, for count>0.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.
[modifica] Possibile implementazione
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; } |
[modifica] Esempio
Il codice seguente riempie un array di interi con numeri casuali .
Original:
The following code fills an array of integers with random numbers.
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.
#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"; }
Output:
52894 15984720 41513563 41346135 51451456
[modifica] Vedi anche
| assegna un valore a un numero di elementi 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. (funzione di modello) | |
| salva il risultato di una funzione in un intervallo 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. (funzione di modello) | |
