Class randu

exprtk_simple_example_19.cpp:29–80

template <typename T>
class randu : public exprtk::igeneric_function<T>
{
public:

   typedef typename exprtk::igeneric_function<T> igfun_t;
   typedef typename igfun_t::parameter_list_t    parameter_list_t;
   typedef typename igfun_t::generic_type        generic_type;
   typedef typename generic_type::vector_view    vector_t;

   using exprtk::igeneric_function<T>::operator();

   randu()
   : exprtk::igeneric_function<T>("V|VTT")
     /*
        Overloads:
        0. V   - vector
        1. VTT - vector, r0, r1
     */
   { ::srand(static_cast<unsigned int>(time(NULL))); }

   inline T operator()(const std::size_t& ps_index, parameter_list_t parameters)
   {
      vector_t v(parameters[0]);

      std::size_t r0 = 0;
      std::size_t r1 = v.size() - 1;

      using namespace exprtk::rtl::vecops::helper;

      if (
           (1 == ps_index) &&
           !load_vector_range<T>::process(parameters, r0, r1, 1, 2, 0)
         )
         return T(0);

      for (std::size_t i = r0; i <= r1; ++i)
      {
         v[i] = rnd();
      }

      return T(1);
   }

private:

   inline T rnd()
   {
      // Note: Do not use this in production
      // Result is in the interval [0,1)
      return T(::rand() / T(RAND_MAX + 1.0));
   }
};

template <typename T>
void vector_randu()