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std::random_device

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< cpp‎ | numeric‎ | random

 
 
Numerik-Bibliothek
Gemeinsame mathematischen Funktionen
Floating-Point-Umgebung
Komplexe Zahlen
Numerische Arrays
Pseudo-Zufallszahlen
Compile-time rationale Arithmetik (C++11)
Generische numerische Operationen
Original:
Generic numeric operations
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iota(C++11)
accumulate
inner_product
adjacent_difference
partial_sum
 
Pseudo-Zufallszahlen
Motoren und Adaptern
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)
Generatoren
Original:
Generators
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random_device(C++11)
Ausschüttungen
Original:
Distributions
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Uniform-Distributionen
Original:
Uniform distributions
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uniform_int_distribution(C++11)
uniform_real_distribution(C++11)
generate_canonical(C++11)
Bernoulli-Distributionen
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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)
Poisson-Verteilungen
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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)
Normalverteilungen
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)
Sampling-Distributionen
Original:
Sampling distributions
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discrete_distribution(C++11)
piecewise_constant_distribution(C++11)
piecewise_linear_distribution(C++11)
Seed-Sequenzen
Original:
Seed Sequences
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seed_seq(C++11)
C-Bibliothek
Original:
C library
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rand
srand
RAND_MAX
 
std::random_device
Member-Funktionen
Original:
Member functions
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random_device::random_device
Generation
Original:
Generation
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random_device::operator()
Merkmale
Original:
Characteristics
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random_device::entropy
random_device::min
random_device::max
 
Defined in header <random>
class random_device;
(seit C++11)
std::random_device ist eine ganze Zahl gleichmäßig verteilten Zufallszahlengenerator, der nicht-deterministischen Zufallszahlen erzeugt, wenn eine nicht-deterministische Quelle (zB eine Hardwarevorrichtung) verfügbar ist für die Umsetzung .
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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Inhaltsverzeichnis

[Bearbeiten] Mitglied Typen

Mitglied Typ
Original:
Member type
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Definition
result_type unsigned int

[Bearbeiten] Member-Funktionen

Construction
Original:
Construction
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baut den Motor
Original:
constructs the engine
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(öffentliche Elementfunktion) [edit]
operator=
(gelöscht)
der Zuweisungsoperator wird gelöscht
Original:
the assignment operator is deleted
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(öffentliche Elementfunktion)
Generation
Original:
Generation
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Fortschritte des Motors Zustand und gibt den generierten Wert
Original:
advances the engine's state and returns the generated value
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(öffentliche Elementfunktion) [edit]
Merkmale
Original:
Characteristics
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erhält die Entropie-Schätzung für die nicht-deterministischen Zufallszahlengenerator
Original:
obtains the entropy estimate for the non-deterministic random number generator
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(öffentliche Elementfunktion) [edit]
[statisch]
erhält den kleinstmöglichen Wert im Leistungsbereich
Original:
gets the smallest possible value in the output range
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(public static Elementfunktion) [edit]
[statisch]
gets the largest possible value in the output range
(public static Elementfunktion) [edit]

[Bearbeiten] Beispiel

#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';
}

Output:

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