C ++ 11多個隨機數引擎適配器

Question

是否可以同時使用C ++ 11中STL提供的隨機引擎和多個適配器？

例如，使用具有Discard Block引擎適配器的Mersenne Twister引擎（來自基本引擎生成的每個P大小塊，適配器僅保留R號，丟棄其余的）和Shuffle Order引擎適配器 （提供輸出隨機數引擎的順序不同）。

示例引擎適配器用於任何不知道的人：

//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，你可以這么做。 您只需要根據另一個定義一個適配器類型：

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);