Varianti

    std::seed_seq

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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
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    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
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    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
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    Generators
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    random_device(C++11)
    Distribuzioni
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    Distributions
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    Distribuzioni uniformi
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    Uniform distributions
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    uniform_int_distribution(C++11)
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    Bernoulli distribuzioni
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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 distribuzioni
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    Poisson distributions
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    poisson_distribution(C++11)
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    Normal distributions
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    Distribuzioni di campionamento
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    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::seed_seq
    Membri funzioni
    Original:
    Member functions
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    seed_seq::seed_seq
    seed_seq::generate
    seed_seq::size
    seed_seq::param
     
    <tbody> </tbody>
    Elemento definito nell'header <random>
    class seed_seq;
    		 (dal C++11)
    std::seed_seq consuma una sequenza di valori interi dati e produce un numero richiesto di valori interi senza segno i, 0 ≤ i < 232
    , sulla base dei dati consumati. I valori prodotti sono distribuiti sull'intera gamma 32-bit, anche se i valori sono vicini consumati.
    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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    Esso fornisce un modo per seme un gran numero di motori di numeri casuali o un generatore di seme che richiede molta entropia, dato un piccolo seme o una sequenza mal distribuita seme iniziale.
    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 soddisfi i requisiti di SeedSequence.
    Original:
    std::seed_seq meets the requirements of SeedSequence.
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    Membri tipi

    Membro tipo
    Original:
    Member type
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    		 Definition
    result_type std::uint_least32_t

    Membri funzioni
    costrutti e semi il std :: seed_seq oggetto
    Original:
    constructs and seeds the std::seed_seq object
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    (metodo pubblico)
    operator=
    (cancellato)
    non copia-assegnabile
    Original:
    not copy-assignable
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    (metodo pubblico)
    calcola i polarizzazione-eliminati, uniformemente distribuiti valori a 32 bit
    Original:
    calculates the bias-eliminated, evenly distributed 32-bit values
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    (metodo pubblico)
    ottiene il numero di valori a 32 bit memorizzati in std :: seed_seq
    Original:
    obtains the number of 32-bit values stored in std::seed_seq
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    (metodo pubblico)
    ottiene i valori a 32 bit memorizzati in std :: seed_seq
    Original:
    obtains the 32-bit values stored in std::seed_seq
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    (metodo pubblico)

    Esempio

    #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';
}

    Output: 

    4204997637
4246533866
1856049002
1129615051
690460811
1075771511
46783058
3904109078
1534123438
1495905678