Math code snippet to obtain the product terms of a factorial. One can use this approach with DivideTerms to calculate the division of large factorials.


#include <algorithm

#include <functional>

#include <numeric>

#include <vector>



//From http://www.richelbilderbeek.nl/CppFunctorIncrease.htm

struct Increase : public std::unary_function<void,int>

{

  explicit Increase(const int& initValue = 0) : mValue(initValue) {}

  void operator()(int& anything)

  {

    anything = mValue;

    ++mValue;

  }

  private:

  int mValue;

};



//From http://www.richelbilderbeek.nl/CppGetFactorialTerms.htm

const std::vector<int> GetFactorialTerms(const int n)

{

  std::vector<int> v(n);

  std::for_each(v.begin(), v.end(),Increase(1));

  return v;

}

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(C++) GetFactorialTerms