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std::random_device

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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
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Generators
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random_device (C++11)
Les distributions
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Distributions
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Distributions uniformes
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Uniform distributions
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uniform_int_distribution (C++11)
uniform_real_distribution (C++11)
generate_canonical (C++11)
Distributions de Bernoulli
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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
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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
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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
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Sampling distributions
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discrete_distribution (C++11)
piecewise_constant_distribution (C++11)
piecewise_linear_distribution (C++11)
Séquences de semences
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Seed Sequences
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seed_seq (C++11)
Bibliothèque C
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C library
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rand
srand
RAND_MAX
 
std::random_device
Les fonctions membres
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Member functions
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random_device::random_device
Génération
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Generation
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random_device::operator()
Caractéristiques
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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

Types de membres

Type de membre
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Member type
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 Definition
result_type unsigned int

Les fonctions membres

Modèle:cpp/numeric/random/engine/dcl list constructorModèle:cpp/numeric/random/engine/dcl list operator()Modèle:cpp/numeric/random/random device/dcl list entropyModèle:cpp/numeric/random/engine/dcl list minModèle:cpp/numeric/random/engine/dcl list max
Construction
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Construction
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operator=
(
supprimée
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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
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Generation
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Caractéristiques
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Characteristics
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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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