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std::seed_seq

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< cpp‎ | numeric‎ | random

 
 
Biblioteca numéricos
Funções matemáticas comuns
De ponto flutuante ambiente
Números complexos
Matrizes numéricas
Pseudo-aleatório de geração de números
Tempo de compilação aritmética racional (C++11)
Genéricos operações numéricas
Original:
Generic numeric operations
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iota(C++11)
accumulate
inner_product
adjacent_difference
partial_sum
 
Pseudo-aleatório de geração de números
Motores e adaptadores de motor
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)
Geradores
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Generators
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random_device(C++11)
Distribuições
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Distributions
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Distribuições 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)
Distribuições 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)
Distribuições 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)
Distribuições normais
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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)
Distribuições de amostragem
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Sampling distributions
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discrete_distribution(C++11)
piecewise_constant_distribution(C++11)
piecewise_linear_distribution(C++11)
Seqüências de sementes
Original:
Seed Sequences
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seed_seq(C++11)
C biblioteca
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C library
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rand
srand
RAND_MAX
 
std::seed_seq
Funções de membro
Original:
Member functions
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seed_seq::seed_seq
seed_seq::generate
seed_seq::size
seed_seq::param
 
Defined in header <random>
class seed_seq;
(a partir do C++ 11)
std::seed_seq consome uma sequência de número inteiro com valores de dados e produz um número requerido de valores inteiros sem sinal i, 0 ≤ i < 232
, com base nos dados consumidos. Os valores produzidos são distribuídos ao longo da gama de 32-bit inteiro, mesmo que os valores são consumidos perto.
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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Ele fornece um modo de sementes de um grande número de mecanismos de números aleatórios ou de sementes de um gerador, que requer uma grande quantidade de entropia, dada uma pequena semente ou de uma sequência de sementes mal distribuída inicial.
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 cumpre os requisitos da SeedSequence.
Original:
std::seed_seq meets the requirements of SeedSequence.
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[editar] Tipos de membro

Tipo de membro
Original:
Member type
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Definition
result_type std::uint_least32_t

[editar] Funções de membro

construções e sementes o std :: objeto seed_seq
Original:
constructs and seeds the std::seed_seq object
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(função pública membro)
operator=
(excluída)
cópia não-transmissíveis
Original:
not copy-assignable
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(função pública membro)
calcula o viés-eliminados, distribuídos uniformemente valores de 32 bits
Original:
calculates the bias-eliminated, evenly distributed 32-bit values
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(função pública membro)
obtém o número de valores de 32 bits armazenados em std :: seed_seq
Original:
obtains the number of 32-bit values stored in std::seed_seq
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(função pública membro)
obtém os valores de 32 bits armazenados em std :: seed_seq
Original:
obtains the 32-bit values stored in std::seed_seq
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(função pública membro)

[editar] Exemplo

#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