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std::random_device

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< cpp‎ | numeric‎ | random

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C++
 
Bibliothèque Numerics
Fonctions mathématiques courantes
Virgule flottante environnement
Nombres complexes
Tableaux numériques
La génération de nombres pseudo-aléatoires
Moment de la compilation arithmétique rationnelle (C++11)
Génériques des opérations numériques
Original:
Generic numeric operations
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iota (C++11)
accumulate
inner_product
adjacent_difference
partial_sum
 
La génération de nombres pseudo-aléatoires
Les moteurs et les adaptateurs de moteur
Original:
Engines and engine adaptors
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linear_congruential_engine (C++11)
mersenne_twister_engine (C++11)
subtract_with_carry_engine (C++11)
discard_block_engine (C++11)
independent_bits_engine (C++11)
shuffle_order_engine (C++11)
Générateurs
Original:
Generators
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random_device (C++11)
Les distributions
Original:
Distributions
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Distributions uniformes
Original:
Uniform distributions
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uniform_int_distribution (C++11)
uniform_real_distribution (C++11)
generate_canonical (C++11)
Distributions de Bernoulli
Original:
Bernoulli distributions
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bernoulli_distribution (C++11)
binomial_distribution (C++11)
negative_binomial_distribution (C++11)
geometric_distribution (C++11)
Distributions de Poisson
Original:
Poisson distributions
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poisson_distribution (C++11)
exponential_distribution (C++11)
gamma_distribution (C++11)
weibull_distribution (C++11)
extreme_value_distribution (C++11)
Les distributions normales
Original:
Normal distributions
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normal_distribution (C++11)
lognormal_distribution (C++11)
chi_squared_distribution (C++11)
cauchy_distribution (C++11)
fisher_f_distribution (C++11)
student_t_distribution (C++11)
Distributions d'échantillonnage
Original:
Sampling distributions
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discrete_distribution (C++11)
piecewise_constant_distribution (C++11)
piecewise_linear_distribution (C++11)
Séquences de semences
Original:
Seed Sequences
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seed_seq (C++11)
Bibliothèque C
Original:
C library
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rand
srand
RAND_MAX
 
std::random_device
Les fonctions membres
Original:
Member functions
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random_device::random_device
Génération
Original:
Generation
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random_device::operator()
Caractéristiques
Original:
Characteristics
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random_device::entropy
random_device::min
random_device::max
 
Déclaré dans l'en-tête <random>
class random_device;
 (depuis C++11)
std::random_device est uniformément distribuée un générateur de nombre aléatoire entier, qui produit non déterministes nombres aléatoires, si une source non-déterministe (par exemple, un dispositif matériel) est disponible pour la mise en oeuvre .
Original:
std::random_device is a uniformly-distributed integer random number generator, which produces non-deterministic random numbers, if a non-deterministic source (e.g. a hardware device) is available to the implementation.
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Sommaire

[modifier] Types de membres

Type du membre Définition
result_type unsigned int

[modifier] Fonctions membres

Construction
Original:
Construction
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construit le moteur
Original:
constructs the engine
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(fonction membre publique) [edit]
operator=
(
supprimée
Original:
deleted
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)
l'opérateur d'affectation est supprimé
Original:
the assignment operator is deleted
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(fonction membre publique)
Génération
Original:
Generation
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avancées état du moteur et retourne la valeur générée
Original:
advances the engine's state and returns the generated value
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(fonction membre publique) [edit]
Caractéristiques
Original:
Characteristics
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obtient l'estimation de l'entropie pour le générateur de non-déterministe de nombres aléatoires
Original:
obtains the entropy estimate for the non-deterministic random number generator
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(fonction membre publique) [edit]
[
statique
Original:
static
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]
obtient la valeur la plus petite possible dans la plage de sortie
Original:
gets the smallest possible value in the output range
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(fonction membre publique statique) [edit]
[
statique
Original:
static
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]
obtient la plus grande valeur possible dans la plage de sortie
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gets the largest possible value in the output range
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(fonction membre publique statique) [edit]

[modifier] Exemple

#include <iostream>
#include <string>
#include <map>
#include <random>
int main()
{
    std::random_device rd;
    std::map<int, int> hist;
    for(int n=0; n<20000; ++n)
        ++hist[rd()%10];
    for(auto p : hist)
        std::cout << p.first << " : " << std::string(p.second/100, '*') << '\n';
}

Résultat : 

0 : ********************
1 : *******************
2 : ********************
3 : ********************
4 : ********************
5 : *******************
6 : ********************
7 : ********************
8 : *******************
9 : ********************
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