C++11 多随机数引擎适配器

Question

是否可以同时使用多个适配器在 C++11 中由 STL 提供的随机引擎？

例如，将 Mersenne Twister 引擎与 Discard Block engine adaptor (from each block of size P generated by the base engine, the adaptor keeps only R numbers, discarding the rest) and the Shuffle Order engine adaptor 一起使用（以不同的顺序提供随机数引擎的输出）。

示例引擎适配器使用不知情的人：

//some code here to create a valid seed sequence
mt19937 eng(mySeedSequence);
discard_block_engine<mt19937,11,5> discardWrapper(eng);
shuffle_order_engine<mt19937,50> shuffleWrapper(eng);

for (int i=0; i<100; ++i) {
  //for every 5 calls to "discardWrapper()", the twister engine 
  //advances by 11 states (6 random numbers are thrown away)
  cout << discardWrapper() << endl;
}

for (int i=0; i<100; ++i) {
  //essentially 50 random numbers are generated from the Twister
  //engine and put into a maintained table, one is then picked from
  //the table, not necessarily in the order you would expect if you
  //knew the internal state of the engine
  cout << shuffleWrapper() << endl;
}

Answer 1

是的，你可以做到。您只需要根据另一种定义一种适配器类型：

typedef std::discard_block_engine<std::mt19937, 11, 5> discard_engine_t;
typedef std::shuffle_order_engine<discard_engine_t, 50> shuffle_engine_t;

std::mt19937 mt_eng;
discard_engine_t discard_eng(mt_eng);
shuffle_engine_t shuffle_eng(discard_eng);

C++11 多随机数引擎适配器

C++11 multiple random number engine adaptors

c++

random

c++11