Varianti

    std::random_device

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    <metanoindex/>

     
    C++
     
    Numeri libreria
    Comuni funzioni matematiche
    Virgola mobile ambiente
    I numeri complessi
    Array numerici
    Pseudo-casuale generazione
    In fase di compilazione aritmetica razionale (C++11)
    Generici operazioni numeriche
    Original:
    Generic numeric operations
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    iota(C++11)
    accumulate
    inner_product
    adjacent_difference
    partial_sum
     
    Pseudo-casuale generazione
    Motori e adattatori del motore
    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)
    Generatori
    Original:
    Generators
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    random_device(C++11)
    Distribuzioni
    Original:
    Distributions
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    Distribuzioni uniformi
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    Uniform distributions
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    uniform_int_distribution(C++11)
    uniform_real_distribution(C++11)
    generate_canonical(C++11)
    Bernoulli distribuzioni
    Original:
    Bernoulli distributions
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    bernoulli_distribution(C++11)
    binomial_distribution(C++11)
    negative_binomial_distribution(C++11)
    geometric_distribution(C++11)
    Poisson distribuzioni
    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)
    Distribuzioni normali
    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)
    Distribuzioni di campionamento
    Original:
    Sampling distributions
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    discrete_distribution(C++11)
    piecewise_constant_distribution(C++11)
    piecewise_linear_distribution(C++11)
    Seed Sequenze
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    Seed Sequences
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    seed_seq(C++11)
    Libreria C
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    C library
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    rand
    srand
    RAND_MAX
     
    std::random_device
    Membri funzioni
    Original:
    Member functions
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    random_device::random_device
    Generazione
    Original:
    Generation
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    random_device::operator()
    Caratteristiche
    Original:
    Characteristics
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    random_device::entropy
    random_device::min
    random_device::max
     
    <tbody> </tbody>
    Elemento definito nell'header <random>
    class random_device;
    		 (dal C++11)
    std::random_device è uniformemente distribuita intero generatore di numeri casuali, che produce numeri casuali non deterministici, se un non-deterministico di origine (ad esempio un dispositivo hardware) è disponibile per la realizzazione.
    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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    Membri tipi

    Membro tipo
    Original:
    Member type
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    		 Definition
    result_type unsigned int

    Membri funzioni

    Costruzione
    Original:
    Construction
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    costruisce il motore
    Original:
    constructs the engine
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    (metodo pubblico) [modifica]
    operator=
    (cancellato)
    l'operatore di assegnazione è soppresso
    Original:
    the assignment operator is deleted
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    (metodo pubblico)
    Generazione
    Original:
    Generation
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    avanza dello stato del motore e restituisce il valore generato
    Original:
    advances the engine's state and returns the generated value
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    (metodo pubblico) [modifica]
    Caratteristiche
    Original:
    Characteristics
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    ottiene la stima dell'entropia per la non-deterministico generatore di numeri casuali
    Original:
    obtains the entropy estimate for the non-deterministic random number generator
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    (metodo pubblico) [modifica]
    [statico]
    ottiene il valore più piccolo possibile nel campo di uscita
    Original:
    gets the smallest possible value in the output range
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    (metodo pubblico statico) [modifica]
    [statico]
    		 gets the largest possible value in the output range
    (metodo pubblico statico) [modifica]

    Esempio

    #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 : ********************