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std::bernoulli_distribution::bernoulli_distribution

STD：伯努利[医]分配：：Bernoulli[医]分布

explicit bernoulli_distribution( double p = 0.5 (1)(since C++11)
explicit bernoulli_distribution( const param_type& params (2)(since C++11)

构造新的分发对象。第一个版本使用p作为分发参数，第二个版本使用params作为分布参数。

参数

p-the p distribution parameter (probability of generating true)
params-the distribution parameter set

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http：//en.cppreference.com/w/cpp/数值/随机/bernoulli[医]分配/伯努利[医]分布

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