Espaços nominais
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std::random_device

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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
Original:
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
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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::random_device
Funções de membro
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Member functions
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random_device::random_device
Geração
Original:
Generation
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random_device::operator()
Características
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Characteristics
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random_device::entropy
random_device::min
random_device::max
 
Defined in header <random>
class random_device;
(a partir do C++ 11)
std::random_device é uniformemente distribuída gerador de número inteiro aleatório, o que produz não-determinísticos números aleatórios, se uma fonte não-determinística (por exemplo, um dispositivo de hardware) está disponível para a aplicação.
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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Índice

[editar] Tipos de membro

Tipo de membro
Original:
Member type
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Definition
result_type unsigned int

[editar] Funções de membro

Construção
Original:
Construction
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constrói o motor
Original:
constructs the engine
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(função pública membro) [edit]
operator=
(excluída)
o operador de atribuição é excluído
Original:
the assignment operator is deleted
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(função pública membro)
Geração
Original:
Generation
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avanços do estado do motor e retorna o valor gerado
Original:
advances the engine's state and returns the generated value
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(função pública membro) [edit]
Características
Original:
Characteristics
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obtém a estimativa de entropia para o gerador de número aleatório não-determinística
Original:
obtains the entropy estimate for the non-deterministic random number generator
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(função pública membro) [edit]
[estática]
recebe o menor valor possível no intervalo de saída
Original:
gets the smallest possible value in the output range
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(função public static membro) [edit]
[estática]
gets the largest possible value in the output range
(função public static membro) [edit]

[editar] Exemplo

#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 : ********************