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std::random_device

提供: cppreference.com
< cpp‎ | numeric‎ | random

 
 
ニューメリックスライブラリ
一般的な数学関数
浮動小数点環境
複素数
数値配列
擬似乱数生成
コンパイル時有理数演算 (C++11)
汎用の数値演算
Original:
Generic numeric operations
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iota(C++11)
accumulate
inner_product
adjacent_difference
partial_sum
 
擬似乱数生成
エンジンとエンジンアダプタ
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)
ジェネレータ
Original:
Generators
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random_device(C++11)
ディストリビューション
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Distributions
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一様分布
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Uniform distributions
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uniform_int_distribution(C++11)
uniform_real_distribution(C++11)
generate_canonical(C++11)
ベルヌーイ分布
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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)
ポアソン分布
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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)
正規分布
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)
サンプリング分布
Original:
Sampling distributions
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discrete_distribution(C++11)
piecewise_constant_distribution(C++11)
piecewise_linear_distribution(C++11)
シードシーケンス
Original:
Seed Sequences
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seed_seq(C++11)
Cライブラリ
Original:
C library
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rand
srand
RAND_MAX
 
std::random_device
メンバ関数
Original:
Member functions
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random_device::random_device
世代
Original:
Generation
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random_device::operator()
特性
Original:
Characteristics
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random_device::entropy
random_device::min
random_device::max
 
Defined in header <random>
class random_device;
(C + + 11以来)
std::random_device非決定ソースは(ハードウェアデバイスなど)が実装に利用可能である場合は、非決定論的乱数を生成一様分布する整数の乱数発生器、です.
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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目次

[編集] メンバータイプ

メンバー·タイプ
Original:
Member type
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Definition
result_type unsigned int

[編集] メンバ関数

建設
Original:
Construction
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エンジンを構築します
Original:
constructs the engine
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(パブリックメンバ関数) [edit]
operator=
(削除された)
代入演算子が削除されます
Original:
the assignment operator is deleted
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(パブリックメンバ関数)
世代
Original:
Generation
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エンジンの状態の進歩と生成された値を返します
Original:
advances the engine's state and returns the generated value
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(パブリックメンバ関数) [edit]
特性
Original:
Characteristics
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非決定論的乱数生成のためのエントロピー見積りを取得します
Original:
obtains the entropy estimate for the non-deterministic random number generator
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(パブリックメンバ関数) [edit]
[静的]
出力範囲で可能な最小値を取得します
Original:
gets the smallest possible value in the output range
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(公共の静的メンバ関数) [edit]
[静的]
gets the largest possible value in the output range
(公共の静的メンバ関数) [edit]

[編集]

#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 : ********************