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std::seed_seq

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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
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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
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::seed_seq
Les fonctions membres
Original:
Member functions
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seed_seq::seed_seq
seed_seq::generate
seed_seq::size
seed_seq::param
 
Déclaré dans l'en-tête <random>
class seed_seq;
 (depuis C++11)
std::seed_seq consomme une séquence de valeurs entières de données et produit un nombre requis de i des entiers non signés, 0 ≤ i < 232
, sur la base des données consommées. Les valeurs produites sont réparties sur toute la plage de 32-bit, même si les valeurs sont proches consommées .
Original:
std::seed_seq consumes a sequence of integer-valued data and produces a requested number of unsigned integer values i, 0 ≤ i < 232
, based on the consumed data. The produced values are distributed over the entire 32-bit range even if the consumed values are close.
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Il fournit un moyen pour ensemencer un grand nombre de moteurs de nombres aléatoires ou un générateur de semences qui nécessite beaucoup d'entropie, étant donné une petite graine ou une séquence de graines mal réparties initiale .
Original:
It provides a way to seed a large number of random number engines or to seed a generator that requires a lot of entropy, given a small seed or a poorly distributed initial seed sequence.
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std::seed_seq répond aux exigences de SeedSequence .
Original:
std::seed_seq meets the requirements of SeedSequence.
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[modifier] Types de membres

Type du membre Définition
result_type std::uint_least32_t

[modifier] Fonctions membres
constructions et les graines de l'objet std :: seed_seq
Original:
constructs and seeds the std::seed_seq object
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(fonction membre publique)
operator=
(
supprimée
Original:
deleted
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)
pas de copier-cessible
Original:
not copy-assignable
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(fonction membre publique)
calcule les préjugés éliminés, en répartissant les valeurs 32 bits
Original:
calculates the bias-eliminated, evenly distributed 32-bit values
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(fonction membre publique)
obtient le nombre de valeurs 32 bits stockées dans std :: seed_seq
Original:
obtains the number of 32-bit values stored in std::seed_seq
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(fonction membre publique)
obtient les valeurs 32-bits stockés dans std :: seed_seq
Original:
obtains the 32-bit values stored in std::seed_seq
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(fonction membre publique)

[modifier] Exemple

#include <random>
#include <iostream>
 
int main()
{
    std::seed_seq seq({1,2,3,4,5});
    std::vector<std::uint32_t> seeds(10);
    seq.generate(seeds.begin(), seeds.end());
    for(std::uint32_t n : seeds)
        std::cout << n << '\n';
}

Résultat : 

4204997637
4246533866
1856049002
1129615051
690460811
1075771511
46783058
3904109078
1534123438
1495905678
Récupérée de « https://fr.cppreference.com/mwiki/index.php?title=cpp/numeric/random/seed_seq&oldid=49072 »